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arxiv_abstracts_gfissore | 2,003 | Completeness of USNO-B for High Proper-Motion Stars
I test the completeness of USNO-B detections of high proper-motion
(mu>0.18"/yr) stars and the accuracy of its measurements by comparing them to
the revised NLTT (rNLTT) catalog of Salim & Gould. For 14.5<V<18.5, only 6
such stars are missing from USNO-B while anothe... | 233 | academic |
arxiv_abstracts_gfissore | 2,003 | The Cross-Wavelet Transform and Analysis of Quasiperiodic Behavior in
the Pearson-Readhead VLBI Survey Sources
We introduce an algorithm for applying a cross-wavelet transform to analysis
of quasiperiodic variations in a time-series, and introduce significance tests
for the technique. We apply a continuous wavelet tr... | 256 | academic |
arxiv_abstracts_gfissore | 2,003 | Deconstructing HD 28867
The 3" pair of B9 stars, HD 28867, is one of the brightest X-ray sources in
the Taurus-Auriga star forming region. In this multi-wavelength study, we
attempt to deduce the source of the X-ray emission. We show that the East
component is the X-ray source. The East component has a near-IR excess ... | 219 | academic |
arxiv_abstracts_gfissore | 2,003 | Emission Line Galaxies in the STIS Parallel Survey II: Star Formation
Density
We present the luminosity function of [OII]-emitting galaxies at a median
redshift of z=0.9, as measured in the deep spectroscopic data in the STIS
Parallel Survey (SPS). The luminosity function shows strong evolution from the
local value, ... | 248 | academic |
arxiv_abstracts_gfissore | 2,003 | The Sloan Digital Sky Survey: The Cosmic Spectrum and Star-Formation
History
We present a determination of the `Cosmic Optical Spectrum' of the Universe,
i.e. the ensemble emission from galaxies, as determined from the red-selected
Sloan Digital Sky Survey main galaxy sample and compare with previous results
of the b... | 340 | academic |
arxiv_abstracts_gfissore | 2,003 | Review on the Observed and Physical Properties of Core Collapse
Supernovae
This paper summarizes observed and physical properties of all types of core
collapse supernovae. Despite the great diversity displayed by these objects,
several regularities emerge which suggest that 1) there is a continuum in the
properties o... | 177 | academic |
arxiv_abstracts_gfissore | 2,003 | Grain Acceleration by MHD Turbulence: Gyroresonance Mechanism
We discuss a new mechanism of dust acceleration that acts in a turbulent
magnetized medium. The magnetohydrodynamic (MHD) turbulence includes both fluid
motions and magnetic fluctuations. We show that while the fluid motions bring
about grain motions throug... | 190 | academic |
arxiv_abstracts_gfissore | 2,003 | The Virgo High-Resolution CO Survey I. CO Atlas
We present the results of the Virgo high-resolution CO survey (ViCS) obtained
with the Nobeyama Millimeter-wave Array (NMA). This survey was made in the
course of a long-term project at Nobeyama from 1999 December through 2002
April. The objects were selected from Virgo ... | 262 | academic |
arxiv_abstracts_gfissore | 2,003 | The Virgo High-Resolution CO Survey. II. Rotation Curves and Dynamical
Mass Distributions
Based on a high-resolution CO survey of Virgo spirals with the Nobeyama
Millimeter-wave Array, we determined the dynamical centers using velocity
fields, and derived position-velocity diagrams (PVDs) along the major axes of
the ... | 309 | academic |
arxiv_abstracts_gfissore | 2,003 | The Virgo High-Resolution CO Survey. III. NGC 4254
We present high-angular-resolution (1".5 - 5") interferometer observations of
the emission in the central region of the SA(s)c galaxy NGC 4254. The
observations were obtained using the Nobeyama Millimeter-wave Array (NMA)
during the course of a long-term CO line surve... | 311 | academic |
arxiv_abstracts_gfissore | 2,003 | Dirty Fireballs and Orphan Afterglows: A Tale of Two Transients
Orphan afterglows are transient events that are produced by cosmological
fireballs and resemble gamma ray burst (GRB) afterglows, yet are not
accompanied by gamma rays. Such transients may be produced by jetlike GRBs
observed off-axis, and therefore hold ... | 395 | academic |
arxiv_abstracts_gfissore | 2,003 | The State of the Universe: Cosmological Parameters 2002
In the past decade, observational cosmology has had one of the most exciting
periods in the past century. The precision with which we have been able to
measure cosmological parameters has increased tremendously, while at the same
time, we have been surprised beyo... | 114 | academic |
arxiv_abstracts_gfissore | 2,003 | A Search for Stellar Obscuration Events due to Dark Clouds
The recent detections of a large population of faint submillimetre sources,
an excess halo gamma-ray background, and the extreme scattering events observed
for extragalactic radio sources have been explained as being due to baryonic
dark matter in the form of ... | 214 | academic |
arxiv_abstracts_gfissore | 2,003 | Evidence for coupling between the Sagittarius dwarf galaxy and the Milky
Way warp
Using recent determinations of the mass and orbit of Sagittarius, I calculate
its orbital angular momentum. From the latest observational data, I also
calculate the angular momentum of the Milky Way's warp. I find that both
angular mome... | 199 | academic |
arxiv_abstracts_gfissore | 2,003 | Boson-fermion stars: exploring different configurations
We use the flexibility of the concept of a fermion-boson star to explore
different configurations, ranging from objects of atomic size and masses of the
order 10^18 g, up to objects of galactic masses and gigantic halos around a
smaller core, with possible intere... | 92 | academic |
arxiv_abstracts_gfissore | 2,003 | Photometric Survey of the Irregular Satellites
We present BVRI colors of 13 Jovian and 8 Saturnian irregular satellites
obtained with the 2.56m Nordic Optical Telescope on La Palma, the 6.5m Magellan
Baade Telescope on La Campanas, and the 6m MMT on Mt. Hopkins. The observations
were performed between December 2001 to... | 281 | academic |
arxiv_abstracts_gfissore | 2,003 | Collective excitations of quantum universe and the problem of dark
matter and energy
In the present report we make an attempt to give an answer to the question of
modern cosmology about the nature of the dark matter and energy in our
universe. On the basis of our quantum cosmological approach, proposed in
1997-2002, ... | 200 | academic |
arxiv_abstracts_gfissore | 2,003 | Intermittent Features of the QSO Ly Transmitted Flux: Results
from Hydrodynamic Cosmological Simulations
It has been recently found that the local fluctuations of the QSO's
Ly absorption spectrum transmitted flux show spiky structures. This
implies that the mass fields of the intergalactic medium (IGM) is intermitten... | 378 | academic |
arxiv_abstracts_gfissore | 2,003 | A Catalog of Broad Absorption Line Quasars from the Sloan Digital Sky
Survey Early Data Release
We present a catalog of 224 broad absorption line quasars (BALQSOs) from the
Sloan Digital Sky Survey's Early Data Release Quasar Catalog, including a
relatively complete and homogeneous subsample of 131 BALQSOs. Since the... | 289 | academic |
arxiv_abstracts_gfissore | 2,003 | The BaR-SPOrt Experiment
BaR-SPOrt (Balloon-borne Radiometers for Sky Polarisation Observations) is an
experiment to measure the linearly polarized emission of sky patches at 32 and
90 GHz with sub-degree angular resolution. It is equipped with high sensitivity
correlation polarimeters for simultaneous detection of bo... | 246 | academic |
arxiv_abstracts_gfissore | 2,003 | Cosmology in a brane-universe
This contribution presents the cosmological models with extra dimensions that
have been recently elaborated, which assume that ordinary matter is confined on
a surface, called brane, embedded in a higher dimensional spacetime. | 52 | academic |
arxiv_abstracts_gfissore | 2,003 | Extended Acceleration in Slot Gaps and Pulsar High-Energy Emission
We revise the physics of primary electron acceleration in the "slot gap" (SG)
above the pulsar polar caps (PCs), a regime originally proposed by Arons and
Scharlemann (1979) in their electrodynamic model of pulsar PCs. We employ the
standard definition... | 356 | academic |
arxiv_abstracts_gfissore | 2,003 | First Results From an X-ray, Weak Lensing, and Sunyaev-Zeldovich Effect
Survey of Nearby Clusters: Abell 3266
As part of a combined Sunyaev-Zeldovich Effect (SZE), X-ray and weak lensing
survey of low redshift (z<0.1) X-ray clusters, we present SZE images of the
z=0.059 X-ray cluster Abell 3266 at three observing fre... | 201 | academic |
arxiv_abstracts_gfissore | 2,003 | The Progenitors of Dwarf Spheroidal Galaxies
Dwarf spheroidal (dSph) galaxies present an evolutionary puzzle that we
explore in 40 early- and late-type dwarfs in the Local Group and nearby field.
Although dSphs formed stars over extended periods, today all but one are free
of detectable interstellar matter (ISM), even... | 452 | academic |
arxiv_abstracts_gfissore | 2,003 | Structure Function Scaling in Compressible Super-Alfvenic MHD Turbulence
Supersonic turbulent flows of magnetized gas are believed to play an
important role in the dynamics of star-forming clouds in galaxies.
Understanding statistical properties of such flows is crucial for developing a
theory of star formation. In th... | 191 | academic |
arxiv_abstracts_gfissore | 2,003 | X-ray emission line gas in the LINER galaxy M81
We present the soft X-ray spectrum of the LINER galaxy M81 derived from a
long observation with the XMM RGS. The spectrum is dominated by continuum
emission from the active nucleus, but also contains emission lines from Fe L,
and H-like and He-like N, O, and Ne. The emis... | 347 | academic |
arxiv_abstracts_gfissore | 2,003 | Toward an Understanding of the Progenitors of Gamma-Ray Bursts
The various possibilities for the progenitors of gamma-ray bursts (GRBs)
manifest in differing observable properties. Through deep spectroscopic and
high-resolution imaging observations of some GRB hosts, I demonstrate that
well-localized long-duration GRB... | 355 | academic |
arxiv_abstracts_gfissore | 2,003 | A Low Latitude Halo Stream around the Milky Way
We present evidence for a ring of stars in the plane of the Milky Way,
extending at least from l = 180 deg to l = 227 deg with turnoff magnitude g
19.5 ; the ring could encircle the Galaxy. We infer that the low Galactic
latitude structure is at a fairly constant distan... | 424 | academic |
arxiv_abstracts_gfissore | 2,003 | High Energy Neutrinos from Gamma Ray Bursts
We treat high-energy neutrino production in GRBs. Detailed calculations of
photomeson neutrino production are presented for the collapsar model, where
internal nonthermal synchrotron radiation is the primary target photon field,
and the supranova model, where external pulsar... | 171 | academic |
arxiv_abstracts_gfissore | 2,003 | CMB Lensing Reconstruction on the Full Sky
Gravitational lensing of the microwave background by the intervening dark
matter mainly arises from large-angle fluctuations in the projected
gravitational potential and hence offers a unique opportunity to study the
physics of the dark sector at large scales. Studies with su... | 208 | academic |
arxiv_abstracts_gfissore | 2,003 | The Effect of Angular Structure of Gamma-Ray Burst Outflows on the
Afterglow Emission
We investigate analytically the effect of an anisotropic distribution of the
kinetic energy within a relativistic fireball on the decay of the afterglow
emission, focusing on axially symmetric fireballs with a uniform core and a
pow... | 304 | academic |
arxiv_abstracts_gfissore | 2,003 | Multi-Wavelength Observations of 1ES1959+650 in a Flaring State
In May 2002, the BL Lacertae object (BL Lac), 1ES1959+650, was detected in
the Very High Energy (VHE) regime by the VERITAS collaboration using the
Whipple -ray observatory. During the following two months, the VERITAS
collaboration observed episodes of f... | 163 | academic |
arxiv_abstracts_gfissore | 2,003 | On the Fractal Dimension of the Visible Universe
Estimates of the fractal dimension D of the set of galaxies in the
universe, based on ever improving data sets, tend to settle on D 2 .
This result raised a raging debate due to its glaring contradiction with
astrophysical models that expect a homogeneous universe. A re... | 154 | academic |
arxiv_abstracts_gfissore | 2,003 | An analytic model for the galactic winds and mass outflows
Galactic winds and mass outflows are observed both in nearby starburst
galaxies and in high-redshift star-forming galaxies. In this paper we develop a
simple analytic model to understand the observed superwind phenomenon. Our
model is built upon the model of M... | 252 | academic |
arxiv_abstracts_gfissore | 2,003 | The SU UMa Nature of the Dwarf Nova, DM Lyrae
We carried out time-resolved V -band photometry of DM Lyr during long
outbursts in 1996 July and in 1996 February-March at Ouda Station, Kyoto
University and at Osaka Kyoiku University. Since superhumps were clearly
detected in the light curves, DM Lyr was first identified... | 227 | academic |
arxiv_abstracts_gfissore | 2,003 | Strong gravitational lensing and galactic bulges
Lensing probabilities of quasars with image separations greater than
and flux density ratios less than q_r are calculated by
foreground dark matter halos in a flat, cosmological constant dominated
() universe . The mass density of the lenses is taken to be the
Navarro-... | 312 | academic |
arxiv_abstracts_gfissore | 2,003 | The Cluster Wind from Local Massive Star Clusters
Results of a study of the theoretically predicted and observed X-ray
properties of local massive star clusters are presented, with a focus on
understanding the mass and energy flow from these clusters into the ISM via a
cluster wind. A simple theoretical model, based o... | 180 | academic |
arxiv_abstracts_gfissore | 2,003 | Extreme Energy Cosmic Rays: Bottom-up vs. Top-down scenarii
We present an overview on extreme energy cosmic rays (EECR) and the
fundamental physics connected with them. The top-down and bottom-up scenarii
are contrasted. We summarize the essential features underlying the top-down
scenarii for EECR, namely, the lifetim... | 365 | academic |
arxiv_abstracts_gfissore | 2,003 | Studying the Evolving Universe with XMM-Newton and Chandra
First indications of the warm/hot intergalactic medium, tracing out the large
scale structure of the universe, have been obtained in sensitive Chandra and
XMM-Newton high resolution absorption line spectroscopy of bright blazars. High
resolution X-ray spectros... | 435 | academic |
arxiv_abstracts_gfissore | 2,003 | Star cluster ecology V: Dissection of an open star cluster--spectroscopy
We have modeled in detail the evolution of rich open star clusters such as
the Pleiades, Praesepe and Hyades, using simulations that include stellar
dynamics as well as the effects of stellar evolution. The dynamics is modeled
via direct N-body i... | 277 | academic |
arxiv_abstracts_gfissore | 2,003 | Implications of 2dFGRS results on cosmic structure
The 2dF Galaxy Redshift Survey is the first to observe more than 100,000
redshifts, making possible precise measurements of many aspects of galaxy
clustering. The spatial distribution of galaxies can be studied as a function
of galaxy spectral type, and also of broad-... | 353 | academic |
arxiv_abstracts_gfissore | 2,003 | Evolution of CNO abundances in the Universe
After summarizing the most important features of current stellar yields of
CNO elements (including recent results concerning rotating and mass losing
stars) I discuss how these yields may help to interpret relevant observations
in the local Galaxy, the Milky Way disk and ext... | 77 | academic |
arxiv_abstracts_gfissore | 2,003 | Further Discoveries of 12CO in Low Surface Brightness Galaxies
Using the IRAM 30m telescope we have obtained seven new, deep CO J(1-0) and
J(2-1) observations of low surface brightness (LSB) galaxies. Five of the
galaxies have no CO detected to extremely low limits (0.1-0.4 K km/s at
J(1-0)), while two of the galaxies... | 333 | academic |
arxiv_abstracts_gfissore | 2,003 | Implementing TOPbase/Iron Project: Continuous Absorption from Fe II
We discuss implementation of TOPbase and Iron Project opacities for stellar
spectral codes. We use a technique employed by Peach, where a
Boltzmann-averaged cross section is calculated for selected temperatures, and
the opacity obtained from double in... | 189 | academic |
arxiv_abstracts_gfissore | 2,003 | The Origin of the Dust Arch in the Halo of NGC 4631: An Expanding
Superbubble?
We study the nature and the origin of the dust arch in the halo of the
edge-on galaxy NGC 4631 detected by Neininger & Dumke (1999). We present CO
observations made using the new On-The-Fly mapping mode with the FCRAO 14m
telescope, and fi... | 339 | academic |
arxiv_abstracts_gfissore | 2,003 | A Photometric and Spectroscopic Study of Dwarf and Giant Galaxies in the
Coma Cluster - IV. The Luminosity Function
A large spectroscopic survey is constructed of galaxies in the Coma cluster.
The survey covers a wide area (1 deg ^2 ) to deep magnitudes (R 19.5),
covering both the core (high density) and outskirts (i... | 400 | academic |
arxiv_abstracts_gfissore | 2,003 | Mapping Magnetic Fields in the Cold Dust at the Galactic Center
We report the detection of polarized emission in the vicinity of the Galactic
center for 158 positions within eight different pointings of the Hertz
polarimeter operating on the Caltech Submillimeter Observatory. These pointings
include positions 2 arcmin... | 297 | academic |
arxiv_abstracts_gfissore | 2,003 | The Birmingham-CfA cluster scaling project - I: gas fraction and the M-T
relation
We have assembled a large sample of virialized systems, comprising 66 galaxy
clusters, groups and elliptical galaxies with high quality X-ray data. To each
system we have fitted analytical profiles describing the gas density and
tempera... | 393 | academic |
arxiv_abstracts_gfissore | 2,003 | Next-generation test of cosmic inflation
The increasing precision of cosmological datasets is opening up new
opportunities to test predictions from cosmic inflation. Here we study the
impact of high precision constraints on the primordial power spectrum and show
how a new generation of observations can provide impress... | 199 | academic |
arxiv_abstracts_gfissore | 2,003 | High Contrast Imaging of Extrasolar Planets
Gaussian aperture pupil masks (GAPMs) can in theory achieve the contrast
requisite for directly imaging an extrasolar planet. We use lab tests and
simulations to further study their possible place as a high contrast imaging
technique. We present lab comparisons with traditio... | 87 | academic |
arxiv_abstracts_gfissore | 2,003 | A New Transiting Extrasolar Giant Planet
We have measured radial velocities of a star, OGLE-TR-56, which shows a
1.2-day transit-like light curve found photometrically by Udalski et
al.(2002ab). Here we show that the velocity changes we detect are probably
induced by an object of 0.9 Jupiter masses - a very close-in g... | 164 | academic |
arxiv_abstracts_gfissore | 2,003 | Low Frequency Coherence Break in The Soft X-ray State of GRS 1915+105
We present results from the analysis of X-ray power density spectra and
coherence when GRS 1915+105 is in soft states. We use three data sets that
belong to , and classes in Belloni et al (2000). We find
that the power density spectra appear to be c... | 204 | academic |
arxiv_abstracts_gfissore | 2,003 | Shear calibration biases in weak lensing surveys
We investigate biases induced by the conversion between the observed image
shape to shear distortion in current weak lensing analysis methods. Such
overall calibration biases cannot be detected by the standard tests such as E/B
decomposition or calibration with stars. W... | 238 | academic |
arxiv_abstracts_gfissore | 2,003 | Three New Long Period X-ray Pulsars Discovered in the Small Magellanic
Cloud
The Small Magellanic Cloud is increasingly an invaluable laboratory for
studying accreting and isolated X-ray pulsars. We add to the class of compact
SMC objects by reporting the discovery of three new long period X-ray pulsars
detected with... | 151 | academic |
arxiv_abstracts_gfissore | 2,003 | Possibly interacting Vorontsov-Velyaminov galaxies. II. The 6m telescope
spectroscopy of VV 080, 131, 499, 523 and 531
In continuation of the program formulated in Paper I we present results of
long-slit spectroscopy with the Russian 6m telescope of five more objects from
the Vorontsov-Velyaminov Atlas and Catalogue ... | 440 | academic |
arxiv_abstracts_gfissore | 2,003 | VLBI Imaging of Seyfert Galaxies
The advent of the Very Long Baseline Array and its phase-referencing
capability have enabled milliarcsecond-scale imaging of radio sources at
sub-millijansky sensitivity, opening the door to high-resolution imaging of
Seyfert galaxies. Over the last few years, this has led to a number ... | 284 | academic |
arxiv_abstracts_gfissore | 2,003 | Wavelet Band Powers of the Primordial Power Spectrum from CMB Data
Measuring the primordial matter power spectrum is our primary means of
probing unknown physics in the very early universe. We allow the primordial
power spectrum to be an arbitrary function, and parametrize it in terms of
wavelet band powers. Current c... | 186 | academic |
arxiv_abstracts_gfissore | 2,003 | Hubble Space Telescope and Ground-Based Optical and Ultraviolet
Observations of GRB010222
We report on Hubble Space Telescope WFPC2 optical and STIS near ultraviolet
MAMA observations, and ground-based optical observations of GRB010222, spanning
15 hrs to 71 days. The observations are well-described by a relativistic... | 269 | academic |
arxiv_abstracts_gfissore | 2,003 | Massive Quiescent Cores in Orion. I. Temperature Structure
We have mapped four massive cores in Orion using the (J,K) = (1,1)
and (J,K) = (2,2) inversion transitions, as part of our effort to study the
pre--protostellar phase of massive star formation. These cores were selected to
be quiescent, i.e. they contain no ap... | 318 | academic |
arxiv_abstracts_gfissore | 2,003 | The 2001 Astronomy Job Market
An overview of the 2001 astronomy job market is presented, highlighting the
recent hiring trends which prospective PhD students and postdocs might like to
be aware of. Cosmology and extragalactic astronomy continue to dominate the
market, with theory/computational positions now outstrippi... | 105 | academic |
arxiv_abstracts_gfissore | 2,003 | Compressible Magnetohydrodynamic Turbulence: mode coupling, scaling
relations, anisotropy, new regime and astrophysical implications
We present numerical simulations and explore scalings and anisotropy of
compressible magnetohydrodynamic (MHD) turbulence. Our study covers both gas
pressure dominated (high beta) and m... | 362 | academic |
arxiv_abstracts_gfissore | 2,003 | The field brown dwarf LP 944-20 and the Castor moving group
A reliable age estimation for the field brown dwarf LP 944-20 is accomplished
through the analysis of its kinematic properties. The space velocities of this
star strongly suggest its membership in the so-called Castor moving group. LP
944-20 can be sensibly a... | 178 | academic |
arxiv_abstracts_gfissore | 2,003 | Geometry of weak lensing of CMB polarization
Hu [Phys. Rev. D62 (2000) 043007] has presented a harmonic-space method for
calculating the effects of weak gravitational lensing on the cosmic microwave
background (CMB) over the full sky. Computing the lensed power spectra to first
order in the deflection power requires o... | 186 | academic |
arxiv_abstracts_gfissore | 2,003 | Magnetic Field Geometry of the Broad Line Radio Galaxy 3C111
Very Long Baseline Polarimetric observations of the Broad Line Radio galaxy
3C111 performed in July and September of 1996 at 8 and 43 GHz reveal rapidly
evolving parsec-scale radio structure after a large millimetre outburst. The
B-field geometry is not simp... | 105 | academic |
arxiv_abstracts_gfissore | 2,003 | Pc-scale study of Radio galaxies & BL Lacs
We study two aspects of the differences between Active Galactic Nuclei (AGN)
of the two Fanaroff-Riley types in order to investigate the causes of the F-R
divide. We (a) contrast the properties of the optical cores in beamed and
unbeamed AGN of the two types, incorporating Hu... | 123 | academic |
arxiv_abstracts_gfissore | 2,003 | One Ring to Encompass them All: A giant stellar structure that surrounds
the Galaxy
We present evidence that the curious stellar population found by the Sloan
Digital Sky Survey in the Galactic anticentre direction extends to other
distant fields that skirt the plane of the Milky Way. New data, taken with the
INT Wid... | 283 | academic |
arxiv_abstracts_gfissore | 2,003 | Magnetic Field Geometry in "Red" and "Blue" BL Lacs
We compare the systematics of the magnetic field geometry in the "red"
low-energy peaked BL Lacs (LBLs) and "blue" high-energy peaked BL Lacs (HBLs)
using VLBI polarimetric images. The LBLs are primarily "radio--selected" BL
Lacs and the HBLs are primarily "X-ray sel... | 191 | academic |
arxiv_abstracts_gfissore | 2,003 | Jeans solutions for triaxial galaxies
The Jeans equations relate the second-order velocity moments to the density
and potential of a stellar system. For general three-dimensional stellar
systems, there are three equations, but these are not very helpful, as they
contain six independent moments. By assuming that the po... | 162 | academic |
arxiv_abstracts_gfissore | 2,003 | A SAURON view of galaxies
We have measured the two-dimensional kinematics and line-strength
distributions of 72 representative nearby early-type galaxies, out to
approximately one effective radius, with our panoramic integral-field
spectrograph SAURON. The resulting maps reveal a rich variety in kinematical
structures... | 265 | academic |
arxiv_abstracts_gfissore | 2,003 | Accelerated expansion of the Crab Nebula and evaluation of its
neutron-star parameters
A model of an accelerated expansion of the Crab Nebula powered by the
spinning-down Crab pulsar is proposed, in which time dependence of the
acceleration is connected with evolution of pulsar luminosity. Using recent
observational ... | 155 | academic |
arxiv_abstracts_gfissore | 2,003 | NGC 4608 and NGC 5701: Barred Galaxies without Disks?
We have performed for the first time in the literature a 2D structural
analysis on the barred lenticular and face--on galaxies NGC 4608 and NGC 5701.
The results indicate that these galaxies either have never had large disks or
their disks were almost completely de... | 166 | academic |
arxiv_abstracts_gfissore | 2,003 | Equation of state of dense matter and maximum mass of neutron stars
Theoretical models of the equation of state (EOS) of neutron-star matter
(starting with the crust and ending at the densest region of the stellar core)
are reviewed. Apart from a broad set of baryonic EOSs, strange quark matter,
and even more exotic (... | 182 | academic |
arxiv_abstracts_gfissore | 2,003 | Microlensing by free-floating brown dwarfs
We propose a near-infrared microlensing survey of the central 2 degree field
of the Galactic Center, in an attempt to estimate the surface density and mass
distribution of distant free-floating brown dwarfs in the bulge and in the
disk, acting as lenses of bright stars toward... | 149 | academic |
arxiv_abstracts_gfissore | 2,003 | Gas Kinematics of Three Hickson Compact Groups: The Data
We present Fabry Perot observations of three Hickson Compact Groups, HCG 88,
HCG 89 and HCG 100. We detect ionized gas in 15 group members, three of which
were previously uncatalogued objects, two in HCG 89 and one in HCG 100. We were
able to derive 2D velocity,... | 240 | academic |
arxiv_abstracts_gfissore | 2,003 | On the accretion luminosity of isolated neutron stars
The accretion process onto a magnetized isolated neutron star, which captures
material from the interstellar medium, is discussed. The evolutionary track of
such a star can be presented as a sequence of four states: ejector, supersonic
propeller, subsonic propeller... | 207 | academic |
arxiv_abstracts_gfissore | 2,003 | Determining Foreground Contamination in CMB Observations: Diffuse
Galactic Emission in the MAXIMA-I Field
Observations of the CMB can be contaminated by diffuse foreground emission
from sources such as Galactic dust and synchrotron radiation. In these cases,
the morphology of the contaminating source is known from ob... | 204 | academic |
arxiv_abstracts_gfissore | 2,003 | Formation of massive binaries
The formation of massive stars is one of the major unsolved problems in
stellar astrophysics. However, only few if any of these are found as single
stars, on average massive stars have more than one companion. Many of them are
born in dense stellar clusters and several clusters have an ex... | 229 | academic |
arxiv_abstracts_gfissore | 2,003 | Integral Field Spectroscopy of SN 2002er with PMAS
We present observations of the Type Ia supernova SN 2002er during the
brightening phase. The observations were performed with the Potsdam Multi
Aperture Spectrophotometer (PMAS) integral field instrument. Due to the 8"*8",
field of view of the spectrograph an accurate... | 137 | academic |
arxiv_abstracts_gfissore | 2,003 | Chances for earth-like planets and life around metal-poor stars
We discuss the difficulties of forming earth-like planets in metal-poor
environments, such as those prevailing in the Galactic halo (Pop II), the
Magellanic Clouds, and the early universe. We suggest that, with less heavy
elements available, terrestrial p... | 145 | academic |
arxiv_abstracts_gfissore | 2,003 | Near-infrared Spectra of Chamaeleon I Stars
We present low resolution (R = 500) near-infrared spectra of 46 candidate
young stellar objects in the Chamaeleon I star-forming region recently detected
in several deep photometric surveys of the cloud. Most of these stars have K <
12. In addition, we present spectra of 63 ... | 235 | academic |
arxiv_abstracts_gfissore | 2,003 | Large Scale Mapping of the Ophiuchi Regions by SWAS
We have completed a 3 square degree CI ^3 P _1 - ^3 P _0 map of the \
Ophiuchi regions using SWAS. The remarkably stable receiver and backends
systems of SWAS allow for uniformly calibrated data set on this scale. Combined
with , \13co, and 18o maps made using FCRAO,... | 109 | academic |
arxiv_abstracts_gfissore | 2,003 | The power spectrum of galaxy clustering in the APM survey
We measure the power spectrum of galaxy clustering in real space from the APM
Galaxy Survey. We present an improved technique for the numerical inversion of
Limber's equation that relates the angular clustering of galaxies to an
integral over the power spectrum... | 438 | academic |
arxiv_abstracts_gfissore | 2,003 | Lyman Break Galaxies at z 5: Luminosity Function
(abridged) We present results of a search for Lyman break galaxies (LBGs) at
z 5 in a 618 square-arcmin field including the HDF-N taken by Subaru Prime
Focus Camera. Utilizing the published redshift data of the HDF-N and its
flanking fields, the color selection criteria... | 447 | academic |
arxiv_abstracts_gfissore | 2,003 | An Alternative to the Variation of the Fine Structure Constant
It is considered that quasars evolve into normal galaxies by means of
expansion of matter. The order of magnitude of the expansion velocity can be
estimated. The Doppler shift caused by such expansion explains the supposed
variation of the fine structure c... | 96 | academic |
arxiv_abstracts_gfissore | 2,003 | The Extended Tidal Tails of Palomar 5: Tracers of the Galactic Potential
We detected extended, curved stellar tidal tails emanating from the sparse,
disrupting halo globular cluster Pal 5, which cover 10 degrees on the sky.
These streams allow us to infer the orbit of Pal 5 and to ultimately constrain
the Galactic pot... | 78 | academic |
arxiv_abstracts_gfissore | 2,003 | Dark Energy and the Fate of the Universe
It is often assumed that in the course of the evolution of the universe, the
dark energy either vanishes or becomes a positive constant. However, recently
it was shown that in many models based on supergravity, the dark energy
eventually becomes negative and the universe collap... | 166 | academic |
arxiv_abstracts_gfissore | 2,003 | Formation of giant planets by fragmentation of protoplanetary disks
The evolution of gravitationally unstable protoplanetary gaseous disks has
been studied with the use of three-dimensional smoothed particle hydrodynamics
simulations with unprecedented resolution. We have considered disks with
initial masses and tempe... | 137 | academic |
arxiv_abstracts_gfissore | 2,003 | Search for and study of extremely metal-deficient galaxies
We summarize the progress in identifying and observational study of extremely
metal-deficient (XMD) gas-rich galaxies (BCGs, dIr and LSBDs). Due to volume
limitations only following issues are addressed: sample creation, some
statistical data, Colour-Magnitude... | 97 | academic |
arxiv_abstracts_gfissore | 2,003 | Phase Coherent Timing of PSR J1811-1925: The Pulsar at the Heart of
G11.2-0.3
The X-ray Pulsar PSR J1811-1925 in the historic supernova remnant G11.2-0.3
has a characteristic age over 10 times the age of the remnant. This likely
implies that its current spin period, 65 ms, is close to its birth spin period.
Alternati... | 281 | academic |
arxiv_abstracts_gfissore | 2,003 | Spectral Fits to the 1999 Aql X-1 Outburst Data
We present analysis and spectral fits of the RXTE data from the May/June 1999
outburst of Aql X-1. These data include observations in the rising portion of
the hard state, in the soft state, and in the falling portion of the hard
state. We show that the data can be fit b... | 264 | academic |
arxiv_abstracts_gfissore | 2,003 | Anomalous X-ray Pulsars: Long-Term Monitoring and Soft-Gamma Repeater
like X-ray Bursts
We report on long-term monitoring of anomalous X-ray pulsars (AXPs) using the
Rossi X-ray Timing Explorer (RXTE). Using phase-coherent timing, we find a wide
variety of behaviors among the sources, ranging from high stability (in ... | 406 | academic |
arxiv_abstracts_gfissore | 2,003 | Control of star formation by supersonic turbulence
Understanding the formation of stars in galaxies is central to much of modern
astrophysics. For several decades it has been thought that stellar birth is
primarily controlled by the interplay between gravity and magnetostatic
support, modulated by ambipolar diffusion.... | 196 | academic |
arxiv_abstracts_gfissore | 2,003 | Radio Galaxies and the Magnetization of the IGM
Observed radio galaxies had a much higher comoving density during the `quasar
era', at z 2-3, but these sources are only detectable for small fractions of
their active lifetimes at such high z due to expansion losses and increased
inverse Compton losses against the cosmi... | 266 | academic |
arxiv_abstracts_gfissore | 2,003 | Detection of Nine M8.0-L0.5 Binaries: The Very Low Mass Binary
Population and its Implications for Brown Dwarf and VLM Star Formation
Use of the highly sensitive Hokupa'a/Gemini curvature wavefront sensor has
allowed direct adaptive optics (AO) guiding on very low mass (VLM) stars with
SpT=M8.0-L0.5. A survey of 39 s... | 465 | academic |
arxiv_abstracts_gfissore | 2,003 | The Discovery of Two Lyman Emitters Beyond Redshift 6 in the
Subaru Deep Field
We have performed a deep optical imaging survey using a narrowband filter
( NB921 ) centered at = 9196 together with i^ and
z^ broadband filters covering an 814 arcmin ^2 area of the Subaru Deep
Field. We obtained a sample of 73 strong NB... | 314 | academic |
arxiv_abstracts_gfissore | 2,003 | The MAHOROBA Project -- Deep Survey with an Optical Intermediate-Band
Filter System on the Subaru Telescope
We present a summary of the new optical intermediate-band filter system for
the prime-focus camera, Suprime-Cam, on the Subaru telescope at Mauna Kea
Observatories. We also discuss a future plan to promote a ne... | 88 | academic |
arxiv_abstracts_gfissore | 2,003 | Quasars are more luminous than radio galaxies - so what?
Surveys to find high-redshift radio galaxies deliberately exclude
optically-bright objects, which may be distant radio-loud quasars. In order to
properly determine the space density of supermassive black holes, the fraction
of such objects missed must be determi... | 141 | academic |
arxiv_abstracts_gfissore | 2,003 | Separability of Rotational Effects on a Gravitational Lens
We derive the deflection angle up to O(m^2a) due to a Kerr gravitational
lens with mass m and specific angular momentum a . It is known that at the
linear order in m and a the Kerr lens is observationally equivalent to the
Schwarzschild one because of the inva... | 204 | academic |
arxiv_abstracts_gfissore | 2,003 | Current Uncertainties in the Use of Cepheids as Distance Indicators
The methods of calibrating the luminosities of galactic Cepheids and
determining Cepheid reddenings are considered in some detail. Together with
work on NGC4258 this suggests that the calibration presented is valid to about
0.1mag (s.e.) at least for ... | 180 | academic |
arxiv_abstracts_gfissore | 2,003 | Miras and Other Cool Variables with GAIA
A general review is given of Mira and other cool variable stars,
concentrating on those aspects on which GAIA, and more particularly GAIA
spectroscopy and radial velocities, will have a major impact. | 54 | academic |
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