bluuebunny/crossref_metadata_2025_split huggingface dataset:
JD6 - The Connection between Radio Properties and High Energy Emission in AGNs
Authors: Giovannini Gabriele , Cheung Teddy 
Published: March 2015

AbstractWhile observations in the radio band are providing essential information on the innermost structures of relativistic jets in active galactic nuclei (AGN), the recent detection byFermiof gamma-ray emission from many hundreds of blazars shows that the maximum jet power is emitted at high energies. Multi-wavelength monitoring observations further allow variability studies of the AGN spectral energy distributions over 13 orders of magnitude in frequency. The Joint Discussion offered the possibility for a comprehensive discussion of advances in the observational domain and stimulated theoretical discussion about our current understanding of jet physics.
Linking the planetary ephemeris to the International Celestial Reference Frame
Authors: Folkner W. M. , Border J. S. 
Published: March 2015

AbstractThe largest uncertainty in the ephemerides for the inner planets is in the orientation of the dynamical system to the celestial reference frame. A program of VLBI measurements of spacecraft in orbit about Venus and Mars has been performed to reduce the orientation uncertainty to 0.2 milliarcseconds.
LAE Galaxies at High Redshift: Formation Sites for Low-Metal Globular Clusters
Authors: Elmegreen Bruce G. , Malhotra Sangeeta , Rhoads James 
Published: March 2015

AbstractLyman-α emitting (LAE) galaxies observed at intermediate to high redshift have the correct size, mass, star formation rate, metallicity, and space density to have been the formation sites of metal-poor globular clusters. LAEs are typically small galaxies with transient starbursts. They should accrete onto spiral and elliptical galaxies over time, delivering metal-poor clusters into the larger galaxies' halos as they themselves get dispersed by tidal forces. The galaxy WLM is a good example of a dwarf remnant from a very early starburst that contains a metal-poor globular cluster but failed to get incorporated into the Milky Way or M31 because of its remote location in the local group.
A longslit spectroscopic survey of bulges in disc galaxies
Authors: Fabricius Maximilian , Saglia Roberto , Fisher David , Drory Niv , Bender Ralf , Hopp Ulrich 
Published: March 2015

AbstractWe use the Marcario Low Resolution Spectrograph (LRS) at the Hobby-Eberly-Telescope (HET) to study the kinematics of pseudobulges and classical bulges in 45 S0-Sc type galaxies in the nearby universe. Our high-resolution (instrumental σ ≈ 39 km s−1) spectra allo only to resolve the typical velocity dispersions of our targets but also to derive the h3 and h4 Gauss-Hermite moments. We demonstrate for the first time that purely kinematic diagnostics of the bulge dichotomy agree systematically with those based on Sérsic index. Low Sérsic index bulges have both increased rotational support (higher v/σ values) and on average lower central velocity dispersions. Pseudobulges have systematically shallower velocity dispersion profiles. The same correlation also holds when visual morphologies are used to diagnose bulge type. Finally, we present evidence for formerly undetected counter rotation in the two systems NGC 3945 and NGC 4736. With these, a total of 16% of the systems in or sample show signs for stellar counter rotation.
Frequency maps as a probe of secular evolution in the Milky Way
Authors: Valluri Monica 
Published: March 2015

AbstractThe frequency analysis of the orbits of halo stars and dark matter particles from a cosmological hydrodynamical simulation of a disk galaxy from the MUGS collaboration (Stinson et al. 2010) shows that even if the shape of the dark matter halo is nearly oblate, only about 50% of its orbits are on short-axis tubes, confirming a previous result: under baryonic condensation all orbit families can deform their shapes without changing orbital type (Valluri et al. 2010). Orbits of dark matter particles and halo stars are very similar reflecting their common accretion origin and the influence of baryons. Frequency maps provide a compact representation of the 6-D phase space distribution that also reveals the history of the halo (Valluri et al. 2012). The 6-D phase space coordinates for a large population of halo stars in the Milky Way that will be obtained from future surveys can be used to reconstruct the phase-space distribution function of the stellar halo. The similarity between the frequency maps of halo stars and dark matter particles (Fig. 1) implies that reconstruction of the stellar halo distribution function can reveal the phase space distribution of the unseen dark matter particles and provide evidence for secular evolution. MV is supported by NSF grant AST-0908346 and the Elizabeth Crosby grant.
Star formation history: secular processes in “main sequence“ galaxies versus merger-driven starbursts
Authors: Bethermin Matthieu 
Published: March 2015

AbstractSome recent works indicate that most star-forming galaxies follow a main sequence in the SFR-stellar mass plane with a surprisingly low scatter of ≈0.2 dex, suggesting that the star formation in these objects is driven by secular processes. Nevertheless, Herschel identified a population of starbursting galaxies, probably triggered by mergers, which display a large excess of specific star formation rate (sSFR=SFR/Mstar) compared to the main sequence. We will present a new set of models for the contribution of these two populations to the IR/sub-mm luminosity function, but also to source counts selected at various wavelengths.Our model is based on the stellar mass function of star-forming galaxies, the distribution of sSFR measured at z=2 and its double-Gaussian decomposition, and the observed evolution of the main sequence in the sSFR-Mass plane as a function of redshift. We found that the non-Schechter bright-end of the LF is due to the starbursting galaxies, which represent only 4% in number density and 15% in luminosity density. This fraction of starbursts is remarkably constant with the redshift at 0<z<2, contrary to naive expectation from hierarchical merging. It thus suggests that the majority of stars in the Universe were formed through secular processes. We will then discuss the contribution of starbursting and main sequence galaxies to the number counts and the selection effects towards starbursts sources for various flux-limited IR/sub-mm samples.We will also present studies of the clustering properties of the main sequence and starburst galaxies at z 2. These measurements suggest strong links between star formation rate, stellar mass and halo mass in the main sequence galaxies. In addition, we will present some clues suggesting that main sequence and starbursting galaxies follows the same M*-Mhalo relation.”
Magnetic field components analysis of the SCUPOL 850 microns polarization data catalog
Authors: Poidevin Frédérick , Falceta-Gonçalves Diego , Kowal Grzegorz , Pino Elisabete De Gouveia Dal , Magalhães Antonio-Mário 
Published: March 2015

AbstractThe SCUPOL catalog is a compilation of 83 regions that were observed at the JCMT between 1997 and 2005. For sufficiently sampled maps, we conduct an analysis for characterizing the polarization and magneto-turbulent properties of the observed regions. The same analysis is done on 2D polarization maps produced by 3D MHD 1024 pixel grid simulations that have been scaled on a sample of observed maps. Each scaled MHD cube of simulated data is used to calculate the mean turbulent regime of each observed regions.
CGPS studies of the Galactic Magnetic Field
Authors: Geisbuesch Joern , Kothes R. , Landecker T. L. 
Published: March 2015

AbstractThe Canadian Galactic Plane Survey (CGPS) is the largest effort of its kind to study and understand the Galactic Magnetic Field (GMF) and Interstellar Medium (ISM) in our Galaxy (see e.g. Taylor et al.2003). The CGPS has mapped the Galactic plane visible from DRAO on all spatial scales down to arcminute resolution in total intensity and polarized emission at νobs=1.4 GHz (see Landecker et al.2010). The latest results invoking Faraday rotation and polarization gradient studies of the CGPS are discussed.
Multiwavelength Magnetic Field Modeling
Authors: Jaffe T. R. 
Published: March 2015

AbstractWe model the large-scale Galactic magnetic fields, including a spiral arm compression to generate anisotropic turbulence, by comparing polarized synchrotron and thermal dust emission. Preliminary results show that in the outer Galaxy, the dust emission comes from regions where the fields are more ordered than average while the situation is reversed in the inner Galaxy. We will attempt in subsequent work to present a more complete picture of what the comparison of these observables tells us about the distribution of the components of the magnetized ISM and about the physics of spiral arm shocks and turbulence.
SpS5 - II. Stellar and wind parameters
Authors: Martins F. , Bergemann M. , Bestenlehner J. M. , Crowther P. A. , Hamann W. R. , Najarro F. , Nieva M. F. , Przybilla N. , Freimanis J. , Hou W. , Kaper L. 
Published: March 2015

AbstractThe development of infrared observational facilities has revealed a number of massive stars in obscured environments throughout the Milky Way and beyond. The determination of their stellar and wind properties from infrared diagnostics is thus required to take full advantage of the wealth of observations available in the near and mid infrared. However, the task is challenging. This session addressed some of the problems encountered and showed the limitations and successes of infrared studies of massive stars.
Probing the interior of asteroid Apophis: a unique opportunity in 2029
Authors: Michel Patrick , Prado J. Y. , Barucci M. A. , Groussin O. , Hérique A. , Hinglais E. , Mimoun D. , Thuillot W. , Hestroffer D. 
Published: March 2015

AbstractThe near Earth asteroid (99942) Apophis, discovered in 2004, (with a diameter of about 270 meters) will come back very close to the Earth on April 13, 2029.The close approach of Apophis to the Earth in 2029 will present an unique opportunity for characterizing this object, serving both science and mitigation purposes. The object will be easily visible from the Earth and it can be expected that its shape and thermal properties will be well determined from ground based observations. However, the characterization of its interior will not be achievable from purely terrestrial observations. Such a characterization, beyond its high scientific value, is essential for planning any mitigation operation, should it be necessary in the future.Near Earth objects are a precious source of information as they represent a mixture of different populations of small bodies containing fundamental information on the origin and early evolution of the solar system.Monitoring the response of Apophis to the gravitational constraints induced by its close approach to the Earth may provide a way to access information on its internal structure.A study to identify some affordable mission scenarii for such a mission is presently underway at CNES (the French Space Agency).We will present the scientific and mitigation objectives of such a mission as well as the preliminary results of the mission analysis and the main system characteristics.
NAO and SHAO participation in the near-Earth space observations
Authors: Shulga A. , Kozyryev Y. , Sybiryakova Y. , Tang Z. , Mao Y. , Li Y. , Yu Y. 
Published: March 2015

AbstractThe joint observations of space debris are conducted by NAO and SHAO. The main task of observations is precise estimation of the hazard collisions of SD with operating satellites. Observations of the near earth asteroids (NEA) on the distance of less than 0.05 AU, according to the NEODyS program, are conducted in NAO. The main task is to obtain the large number of precise observations of the NEAs during their closest approach to the Earth.
IAU Office of Astronomy for Development: Task Force Children and School Education
Authors: Russo Pedro , Gomez Edward 
Published: March 2015

AbstractThe main mission of the IAU OAD Task Force on Children and School Education is to support the implementation of the pre-tertiary education part of the IAU Strategic Plan ‘Astronomy for Development’. In this presentation we will give an overview of the role and programme of the task force as well as a general discussion about the past, present and future IAU education activities and programmes.
An exemplary developing astronomy movement in Nepal
Authors: Neupane Sudeep 
Published: March 2015

AbstractAstronomy and space science education had been given least importance by Nepalese government in the past. The modern astronomy movement is believed to have started when an official observation programme of Haley's comet was organized by Royal Nepal Academy of Science and Technology (RONAST) in 1986. Following the huge pressure from the scientific community, the Nepal government (Kingdom of Nepal at that time) established B.P. Koirala Memorial Planetarium, Observatory and Science Museum Development Board in 1992. Initiatives of the project started with observatory set up and the development of astrophysics syllabus for university students. Astrophysics is included as an elective paper in the Physics masters course. The lead astrophysicist of Nepal Dr. Binil Aryal is running a research group in Tribhuvan University since 2005 which has a significant number of international publications. The developing government initiatives and achievements will be discussed.In 2007, a group of astronomy enthusiastic students along with amateurs working independently in past established Nepal Astronomical Society (NASO), which surprisingly increased the amateur activities and inspired other amateur groups to revive. During IYA 2009, more than 80 outreach and observation events were organized solely by NASO. NASO was able to collaborate with many international programmes and projects like GHOU/GTTP, EurAstro, AWB, UNAWE, SGAC, Star Peace, TWAN etc during and beyond IYA2009. Currently Nepal is recognized as the most eventful country of outreach and astronomy education among the amateur community. The success story of the astronomy movement and the local difficulties while organizing the events will be explained.
Developing Astronomy Research and Education in the Philippines
Authors: Sese R. M. D. , Kouwenhoven M. B. N. (Thijs) 
Published: March 2015

AbstractIn the past few years, the Philippines has been gradually developing its research and educational capabilities in astronomy and astrophysics. In terms of astronomy development, it is still lagging behind several neighboring Southeast Asian countries such as Indonesia, Thailand and Malaysia, while it is advanced with respect to several others. One of the main issues hampering progress is the scarcity of trained professional Filipino astronomers, as well as long-term visions for astronomy development. Here, we will be presenting an overview of astronomy education and research in the country. We will discuss the history and current status of astronomy in the Philippines, including all levels of education, outreach and awareness activities, as well as potential areas for research and collaborations. We also discuss issues that need to be addressed to ensure sustainable astronomy development in the Philippines. Finally, we discuss several ongoing and future programs aimed at promoting astronomy research and education. In essence, the work is a precursor of a possible white paper which we envision to submit to the Department of Science and Technology (DOST) in the near future, with which we aim to further convince the authorities of the importance of astrophysics. With the support of the International Astronomical Union (IAU), this may eventually lead to the creation of a separate astronomy agency in the Philippines.
Different structures formed at HII boundaries
Authors: Miao Jingqi , Cornwall Paul , Kinnear Tim 
Published: March 2015

AbstractHydrodynamic simulations on the evolution of molecular clouds (MCs) at HII boundaries are used to show that radiation driven implosion (RDI) model can create almost all of the different morphological structures, such as a single bright-rimmed cloud (BRC), fragment structure and multiple elephant trunk (ET) structures.
A kinematical catalogue of HII regions and superbubbles in the LMC
Authors: Ambrocio-Cruz P. , Le Coarer E. , Rosado M. , Russeil D. , Amram P. , Laval A. , Epinat B. , Ramírez M. , Odonne M. , Goldes G. 
Published: March 2015

AbstractWe report the results of a kinematic Hα survey of the Large Magellanic Cloud (LMC) in the form of a kinematic and photometric catalogue of 210 HII regions, the radial velocity field of the ionized hydrogen in this galaxy, and the LMC Rotation Curve obtained from the velocity field. These data aim at understanding the LMC HII regions, bubbles and superbubbles in a global (galactic) scale so that we could have a 3D view and separate the rotation due to gravitational potential from other motions such as expansions.
Communicating Astronomy in a Metropolis and Disaster Area – Activities of the Tenpla Project
Authors: Kamegai K. , Takanashi N. , Hiramatsu M. , Naito S. 
Published: March 2015

AbstractWe present recent activities delivering astronomy to the public by the Tenpla project in Japan. One is voluntary activities in the disaster area of the Great East Japan Earthquake. The other is holding tens of star parties and public lectures in the central area of Tokyo.
School Workshops on Astronomy
Authors: Molenda-Żakowicz J. , Żakowicz G. 
Published: March 2015

AbstractDo you want to know how to make students volunteer to stay all night long watching the stars with their telescopes freezing? Or how to inspire decent adults to prepare a ‘queue-list to Jupiter’, wait for their turn for hours, and control that no one approaches the telescope bypassing the line? Or how to attract people of all age to forget their laziness and duties, and to get up at 3 a.m. to watch the transit of Venus? If your answer is ‘yes’, then come and see what can be done at the School Workshops on Astronomy.
Las Cumbres Observatory: Building a global telescope network from the ground up
Authors: Gomez E. L. 
Published: March 2015

AbstractLas Cumbres Observatory Global Telescope Network (LCOGT) are building a global network of telescopes which will be available to both professional scientists and the science curious public. This telescope network will be global and so will the community, therefore all aspects of the endeavour must be online and self-sustaining - from the observing software to the analysis tools. During 2012 LCOGT have deployed the first 1-meter telescopes, and launched a citizen science project using LCOGT data, Agent Exoplanet, as well as many other online resources for anyone to use as they explore astronomy.
Radio Surveys: an Overview
Authors: Morganti Raffaella 
Published: March 2015

AbstractRadio astronomy has provided important surveys that have made possible key (and sometimes serendipitous) discoveries. I will briefly mention some of the past continuum and line (HI) radio surveys as well as new, on-going surveys and surveys planned for the near future. This new generation of large radio surveys is bringing extra challenges in terms of data handling but also great new possibilities thanks to the wider range of data products that they will provide.
The Role of Wide Field X-ray Surveys in Astronomy
Authors: Saxton Richard D. 
Published: March 2015

AbstractWe review the history of X-ray sky surveys from the early experiments to the catalogues of 105 sources produced by ROSAT, Chandra and XMM-Newton. At bright fluxes the X-ray sky is shared between stars, accreting binaries and extragalactic sources while deeper surveys are dominated by AGN and clusters of galaxies. The X-ray background, found by the earliest missions, has been largely resolved into discrete sources at soft (0.3-2 keV) energies but at higher energies an important fraction still escapes detection. The possible identification of the missing flux with Compton-thick AGN has been probed in recent years by Swift and Integral.Variability seen in objects observed at different epochs has proved to be an excellent discriminator for rare classes of objects. The comparison of ROSAT All Sky Survey (RASS) and ROSAT pointed observations identified several Novae and high variability AGN as well as initiating the observational study of Tidal Disruption events. More recently the XMM-Newton slew survey, in conjunction with archival RASS data, has detected further examples of flaring objects which have been followed-up in near-real time at other wavelengths.
Taming the ALMA Data Avalanche
Authors: Stoehr Felix 
Published: March 2015

AbstractThe Atacama Large Millimeter/submillimeter Array (ALMA) is nearing its phase of full operations. ALMA will collect about 200TB/year of astronomical data which will be reduced by an automatic pipeline and turned into fully calibrated science-ready data products. We present design choices, challenges and solutions from data capturing over data reduction and data distribution to archival research, that allow to deal with the large amounts of data and, hopefully, achieve the maximum amount of science return.
Data Intensive Radio Astronomy en route to the SKA: The Rise of Big Radio Data
Authors: Taylor A. R. 
Published: March 2015

AbstractAdvances in both digital processing devices and in technologies to sample the focal and aperture planes of radio antennas is enabling observations of the radio sky with high spectral and spatial resolution combined with large bandwidth and field of view. As a consequence, survey mode radio astronomy generating vast amounts of data and involving globally distributed collaborations is fast becoming a primary tool for scientific advance. The Square Kilometre Array (SKA) will open up a new frontier in data intensive astronomy. Within the next few years SKA precursor telescopes will demonstrate new technologies and take the first major steps toward the SKA. Projects that path find the scientific journey to the SKA with these and other telescopes are currently underway and being planned. The associated exponential growth in data require us to explore new methodologies for collaborative end-to-end execution of data intensive observing programs.
Real-time Visualisation and Analysis of Tera-scale Datasets
Authors: Fluke Christopher J. 
Published: March 2015

AbstractAs we move ever closer to the Square Kilometre Array era, support for real-time, interactive visualisation and analysis of tera-scale (and beyond) data cubes will be crucial for on-going knowledge discovery. However, the data-on-the-desktop approach to analysis and visualisation that most astronomers are comfortable with will no longer be feasible: tera-scale data volumes exceed the memory and processing capabilities of standard desktop computing environments. Instead, there will be an increasing need for astronomers to utilise remote high performance computing (HPC) resources. In recent years, the graphics processing unit (GPU) has emerged as a credible, low cost option for HPC. A growing number of supercomputing centres are now investing heavily in GPU technologies to provide O(100) Teraflop/s processing. I describe how a GPU-powered computing cluster allows us to overcome the analysis and visualisation challenges of tera-scale data. With a GPU-based architecture, we have moved the bottleneck from processing-limited to bandwidth-limited, achieving exceptional real-time performance for common visualisation and data analysis tasks.
Fullerenes in Circumstellar and Interstellar Environments
Authors: Cami Jan 
Published: March 2015

AbstractIn recent years, the fullerene species C60 (and to a lesser extent also C70) has been reported in the mid-IR spectra of various astronomical objects. Cosmic fullerenes form in the circumstellar material of evolved stars, and survive in the interstellar medium (ISM). It is not entirely clear how they form or what their excitation mechanism is.