bluuebunny/crossref_metadata_2025_split huggingface dataset:
Construction of luminosity function for galaxy clusters
Authors: Godłowski Włodzimierz , Popiela Joanna , Bajan Katarzyna , Biernacka Monika , Flin Piotr , Panko Elena 
Published: February 2015

AbstractThe luminosity function is an important quantity for analysis of large scale structure statistics, interpretation of galaxy counts (Lin & Kirshner 1996). We investigate the luminosity function of galaxy clusters. This is performed by counting the brightness of galaxies belonging to clusters in PF Catalogue. The obtained luminosity function is significantly different than that obtained both for optical and radiogalaxies (Machalski & Godowski 2000). The implications of this result for theories of galaxy formation are discussed as well.
Dust as a tracer of gas in galaxies
Authors: Groves Brent , Schinnerer Eva ,   KINGFISH team
Published: February 2015

AbstractWe use a sample of 36 galaxies to study empirical relations between Herschel infrared (IR) luminosities and the total mass of the interstellar gas (H2 + HI). Such a comparison provides a simple empirical relationship without introducing the uncertainty of dust model fitting. We find tight correlations, and provide fits to these relations, between Herschel luminosities and the total gas mass integrated over entire galaxies, with the tightest, almost linear, correlation found for the longest wavelength data (SPIRE500). However, we find that accounting for the gas-phase metallicity (affecting the dust-to-gas ratio) is crucial when applying these relations to low-mass, and presumably high-redshift, galaxies. When examining these relations as a function of galactocentric radius, we find the same correlations, albeit with a larger scatter, up to radius of r ∼ 0.7r25 (containing most of a galaxy's baryonic mass). The tight relations found for the bulk of the galaxy's baryonic content suggest that total gas masses of disk-like (non-merging/ULIRG) galaxies can be inferred from far-infrared continuum measurements in situations where only the latter are available. This work is to appear in Groves et al. (2014).
The interaction of the outflow with the molecular disk in the Active Galactic Nucleus of NGC 6951
Authors: May D. , Steiner J. E. , Ricci T. V. , Menezes R. B. , Andrade I. S. 
Published: February 2015

AbstractContext: we present a study of the central 200 pc of NGC 6951, in the optical and NIR, taken with the Gemini North Telescope integral field spectrographs, with resolution of ~ 0”.1 Methods: we used a set of image processing techniques, as the filtering of high spatial and spectral frequencies, Richardson-Lucy deconvolution and PCA Tomography (Steiner et al.2009) to map the distribution and kinematics of the emission lines. Results: we found a thick molecular disk, with the ionization cone highly misaligned.
Linking star formation and galaxy kinematics in the massive cluster
Abell 2163
Authors: Menacho Veronica , Verdugo Miguel 
Published: February 2015

AbstractThe origin of the morphology-density relation is still an open question in galaxy
evolution. It is most likely driven by the combination of the efficient star
formation in the highest peaks of the mass distribution at
high-z and the transformation by environmental processes at
later times as galaxies fall into more massive halos. To gain additional
insights about these processes we study the kinematics, star formation and
structural properties of galaxies in Abell 2163 a very massive
(~4×1015 M⊙, Holz &
Perlmutter 2012) merging cluster at
z = 0.2.We use high resolution spectroscopy with VLT/VIMOS to derive rotation curves and
dynamical masses for galaxies that show regular kinematics. Galaxies that show
irregular rotation are also analysed to study the origin of their distortion.
This information is combined with stellar masses and structural parameters
obtained from high quality CFHT imaging. From narrow band photometry (2.2m/WFI),
centered on the redshifted Hα line, we obtain star formation rates.Although our sample is still small, field and cluster galaxies lie in a similar
Tully-Fisher relation as local galaxies. Controlling by additional parameters
like SFRs or bulge-to-disk ratio do not affect this result. We find however that
~50% of the cluster galaxies display irregular kinematics in contrast to what is
found in the field at similar redshifts (~30%, Böhm et al.2004) and in agreement with other
studies in clusters (e.g. Bösch et al.2013, Kutdemir et al.2010) which points out to additional
processes operating in clusters that distort the galaxy kinematics.
Disentangling the stellar populations of the counter-rotating stellar disc in NGC 5719
Authors: Morelli L. , Coccato L. , Corsini E. M. , Bontà E. Dalla , Bertola F. , Vergani D. , Buson L. 
Published: February 2015

AbstractWe present the stellar populations properties of the interacting spiral NGC 5719, which is known to host two cospatial counter-rotating stellar discs.
Gas accretion history of galaxies at z ~ 0 - 2: Comparison of the observational data of molecular gas with the mass evolution model of galaxies
Authors: Morokuma Kana , Baba Junichi , Sorai Kazuo , Kuno Nario 
Published: February 2015

AbstractWe found stellar mass-dependent evolution of galactic molecular gas fractions ($f_{\rm mol}=\frac{M_{\rm mol}}{M_\star+M_{\rm mol}}$, Mmol: molecular gas mass, M*: stellar mass) where less massive galaxies have decreased fmol from z = 1 whereas massive galaxies have already had low fmol until z = 1. Comparison of the observed quantities (fmol, optical and near infra-red [NIR] colors, specific star formation rate [sSFR = SFR/M*]) with mass evolution models suggests that less massive galaxies had high fmol at z = 1 thanks to recent gas accretion.
High-resolution 3D dust radiative transfer in galaxies with DART-Ray
Authors: Natale Giovanni , Popescu Cristina C. , Tuffs Richard. J. , Debattista Victor P. , Grootes Meiert W. 
Published: February 2015

AbstractDART-Ray is a 3D ray-tracing dust radiative transfer (RT) code that can be used to derive stellar and dust emission maps of galaxy models and simulations with arbitrary geometries. In addition to the previously published RT algorithm, we have now included in DART-Ray the possibility of calculating the stocastically heated dust emission from each volume element within a galaxy. To show the capabilities of the code, we performed a high-resolution (26 pc) RT calculation for a galaxy N-body+SPH simulation. The simulated galaxy we considered is characterized by a nuclear disc and a flocculent spiral structure. We analysed the derived galaxy maps for the global and local effects of dust on the galaxy attenuation as well as the contribution of scattered radiation to the predicted observed emission. In addition, by performing an additional RT calculation including only the stellar volume emissivity due to young stellar populations (SPs), we derived the contribution to the total dust emission powered by young and old SPs. Full details of this work will be presented in a forthcoming publication.
Stellar Mass Maps for S4G
Authors: Querejeta Miguel , Meidt Sharon E. , Schinnerer Eva ,   S4G
Published: February 2015

AbstractWe present stellar mass maps for the S4G sample based on imaging at 3.6 μm that we correct for the presence of non-stellar emission using an ICA technique. Our dust-free images can be readily converted into stellar mass maps, and this important legacy dataset will be made public through IRSA.
Gas inflow and AGN-driven outflow in M51
Authors: Querejeta M. , Meidt S. E. , Schinnerer E. , García-Burillo S. , Pety J. , Hughes A. , Meier D. , Bigiel F. , Kreckel K. , Blanc G. 
Published: February 2015

AbstractWe study the feeding and feedback of the nucleus of M51 by considering gravitational torques, responsible for gas inflow, in relation to the local distribution of dense gas.
Near-IR Integral Field Spectroscopy of the central region of NGC 5929
Authors: Riffel Rogemar A. , Storchi-Bergmann Thaisa , Riffel Rogério 
Published: February 2015

AbstractWe present two-dimensional (2D) near-infrared spectra of the inner 300×300 pc2 of the Seyfert 2 galaxy NGC 5929 at a spatial resolution of ~20 pc obtained with the Gemini Near infrared Integral Field Spectrograph (NIFS). We present 2D maps for the emission line flux distributions and kinematics and report the discovery of a linear structure ~300 pc in extent and of ~50 pc in width oriented perpendicular to the radio jet, showing broadened emission-line profiles.While over most of the field the emission-line profiles have full-widths-at-half-maximum (FWHM) of ~210 km/s, at a linear structure perpendicular do the radio jet the emission-line FWHMs are twice this value, and are due to two velocity components, one blueshifted and the other redshifted relative to the systemic velocity. We attribute these velocities to an outflow from the nucleus which is launched perpendicular to the radio jet. We reported the detection of this peculiar outflow in Riffel, Storchi-Bergmann & Riffel (2014a), where more details of the analysis can be found. Since, NGC 5929 has a Type 2 nucleus, this detection implies that: (1) both ionizing radiation and relativistic particles are escaping through holes in the torus perpendicular to the radio jet; and/or (2) the torus is also outflowing, as proposed by recent models of tori as winds from the outer parts of an accretion flow; or (3) the torus is absent in NGC 5929.At other locations the gas kinematics is dominated by rotation in a disk, although some evidences of interaction of the radio jet with the emitting gas are seen as a broadening of the line profiles at the locations of the radio structures.The flux distributions for the [P ii], [Fe ii], H i and H2 emission lines show that the line emission is more extended along the PA = 60/240^, extending to up to 1.5” to both sides of the nucleus, while to the perpendicular direction (PA = -30/150^) the emission is extended to 0.7” from the nucleus. The flux distributions of all emission lines show a good correlation with radio the radio structures, with the two peak of emission associated to the soutwestern and northeastern radio knots. Some differences are observed among distinct emission lines. While the [Fe ii] and H2 emission peak at the location of the soutwestern radio structure at 0.6” from the nucleus, the H i recombination lines present the their highest fluxes at the location of the northeastern radio hotspot at 0.5” from the nucleus. Another difference is that the H2 emission is less collimated than that for other lines, being more extended perpendicularly to the radio jet. A detailed analysis of the line emission and kinematics will be presented in Riffel, Storchi-Bergmann & Riffel (2014b).
Spiral Galaxy in 3D as Seen with SpIOMM
Authors: Rousseau-Nepton Laurie , Robert Carmelle , Drissen Laurent 
Published: February 2015

AbstractUsing the imaging Fourier transform spectrograph (FTS) SpIOMM we study 7 nearby spiral galaxies. The large database of spectra obtained around Hα and Hβ is ideal to study the star forming regions and warm ionized medium (WIM) with a high spatial resolution (∼ 50-150 pc).
Kennicutt-Schmidt relation in the HI dominated regime
Authors: Roychowdhury Sambit , Huang Mei-Ling , Kauffmann Guinevere , Chengalur Jayaram N. 
Published: February 2015

AbstractWe investigate the existence of a Kennicutt-Schmidt type relation between ΣSFR and Σgas, atomic in the HI dominated regions of nearby spirals and dwarf irregulars.
An Infrared Luminous Merger with Two Bipolar Molecular Outflows : ALMA View of NGC 3256
Authors: Sakamoto K. , Aalto S. , Combes F. , Evans A. , Peck A. 
Published: February 2015

AbstractWe found with ALMA 3D spectroscopy two bipolar molecular outflows in the luminous infrared galaxy NGC 3256. Each of the two merger nuclei has its own bipolar outflow.
A strong clustering of FIR-selected galaxies in the AKARI All-Sky Survey
Authors: Suzuki Tomoko , Takeuchi Tsutomu T. , Pollo Agnieszka , Oyabu Shinki 
Published: February 2015

AbstractVarious previous galaxy surveys have revealed that different types of galaxies show different spatial distributions. By comparing their clustering strengths, we can investigate the relationship between the environments where galaxies reside and the properties of galaxies. This provides us vital information on when, where, and how galaxies are formed. In this study, we focus on FIR-selected galaxies from AKARI All-Sky Survey, which are considered to be dusty star-forming galaxies. We measure their power spectrum and compare our final result with previous studies using different galaxy samples detected at other wavelengths. It is found that there is the very clear wavelength dependence of the clustering strength.
NGC 5128's Globular Cluster System: Is There a Dark Side?
Authors: Taylor Matthew , Puzia Thomas , Gomez Matias , Woodley Kristin 
Published: February 2015

AbstractDynamical mass estimates (${\cal M}_{\rm dyn}$) and mass-to-light ratios ($\Upsilon_{\rm dyn}$) were derived for a sample of NGC 5128's globular clusters (GCs). We find two distinct sequences in the $\Upsilon_{\rm dyn}$ − ${\cal M}_{\rm dyn}$ plane, which are well fit by power laws of the forms $\Upsilon_{\rm dyn}\propto {\cal M}_{\rm dyn}^{0.33\pm0.04}$ and $\Upsilon_{\rm dyn}\propto {\cal M}_{\rm dyn}^{0.91\pm0.04}$. The former traces bright “classical” GCs, and the latter represents objects that are dynamically dominated by large dark matter components or by abnormally massive central black holes.
Gaseous environment in LLAGN: modes of interaction with compact star nuclear population
Authors: Zajaček M. , Karas V. , Šubr L. , Kunneriath D. , Eckart A. 
Published: February 2015

AbstractThe Galactic center, which serves as a paradigm of low-luminosity active galactic nuclei (LLAGN), hosts the Nuclear star cluster (NSC) that contains both young and more evolved stars. So far the population of the end-products of stellar evolution has not been observationally confirmed and studied, although there are hints of its presence. We study the distribution of interaction modes of a hypothetical population of neutron stars within the sphere of influence of the Sgr A* supermassive black hole (SMBH). The comparison of our models with future observations could be used to constrain the 3D structure of the Galactic center.
Galaxy population study of the 26 most massive galaxy clusters within the SPT footprint
Authors: Zenteno Alfredo 
Published: February 2015

AbstractWe present optical properties of the 26 most massive galaxy clusters in the South Pole Telescope 2500 sq-deg footprint. We find a general consistency between our results and results found in the literature on samples built with different selection techniques. Most interesting, we find a preference for an evolution in the slope of the Schechter function, α, with its value increasing at higher redshift.
Bar effects on ionized gas properties and dust content in galaxy centers
Authors: Zurita A. , Florido E. , Pérez I. , Coelho P. , Gadotti D. A. 
Published: February 2015

AbstractObservations and simulations indicate that bars are important agents to transfer material towards galaxy centers. However, observational studies devoted to investigate the effects of bars in galaxy centers are not yet conclusive. We have used a sample (Coelho & Gadotti 2011) of nearby face–on galaxies with available spectra (SDSS database) to investigate the footprints of bars in galaxy centers by analysing the central ionized gas properties of barred and unbarred galaxies separately. We find statistically significant differences in the Hβ Balmer extinction, star formation rate per unit area, in the [S ii]λ6717/[S ii]λ6731 line ratio, and notably in the N2 parameter (N2 = log([N ii]λ6583/Hα)). A deeper analysis reflects that these differences are only relevant for the less massive bulges (≲1010M⊙). These results have important consequences for studies on bulge formation and galaxy evolution.
A 3D analysis of the metal distribution in the compact group of galaxies HCG 31
Authors: Torres-Flores Sergio , Mendes de Oliveira Claudia , Alfaro-Cuello Mayte , Carrasco Eleazar Rodrigo , de Mello Duilia , Amram Philippe 
Published: February 2015

AbstractWe present new Gemini/GMOS integral field unit observations of the central region of the merging compact group of galaxies HCG 31. Using this data set, we derive the oxygen abundances for the merging galaxies HCG 31A and HCG 31C. We found a smooth metallicity gradient between the nuclei of these galaxies, suggesting a mixing of metals between these objects. These results are confirmed by high-resolution Fabry-Perot data, from which we infer that gas is flowing between HCG 31A and HCG 31C.
Magnetic Resonance Imaging of Electrolysis.
Authors: Meir Arie , Hjouj Mohammad , Rubinsky Liel , Rubinsky Boris 
Published: February 2015

AbstractThis study explores the hypothesis that Magnetic Resonance Imaging (MRI) can image the process of electrolysis by detecting pH fronts. The study has relevance to real time control of cell ablation with electrolysis. To investigate the hypothesis we compare the following MR imaging sequences: T1 weighted, T2 weighted and Proton Density (PD), with optical images acquired using pH-sensitive dyes embedded in a physiological saline agar solution phantom treated with electrolysis and discrete measurements with a pH microprobe. We further demonstrate the biological relevance of our work using a bacterialE. Colimodel, grown on the phantom. The results demonstrate the ability of MRI to image electrolysis produced pH changes in a physiological saline phantom and show that these changes correlate with cell death in theE. Colimodel grown on the phantom. The results are promising and invite further experimental research.
Electronic excitation induced amorphization in titanate pyrochlores: an ab initio molecular dynamics study
Authors: Xiao H. Y. , Weber W. J. , Zhang Y. , Zu X. T. , Li S. 
Published: February 2015

AbstractThe response of titanate pyrochlores (A2Ti2O7, A = Y, Gd and Sm) to electronic excitation is investigated utilizing an ab initio molecular dynamics method. All the titanate pyrochlores are found to undergo a crystalline-to-amorphous structural transition under a low concentration of electronic excitations. The transition temperature at which structural amorphization starts to occur depends on the concentration of electronic excitations. During the structural transition, O2-like molecules are formed and this anion disorder further drives cation disorder that leads to an amorphous state. This study provides new insights into the mechanisms of amorphization in titanate pyrochlores under laser, electron and ion irradiations.
The Molecular Photo-Cell: Quantum Transport and Energy Conversion at Strong Non-Equilibrium
Authors: Ajisaka Shigeru , Žunkovič Bojan , Dubi Yonatan 
Published: February 2015

AbstractThe molecular photo-cell is a single molecular donor-acceptor complex attached to electrodes and subject to external illumination. Besides the obvious relevance to molecular photo-voltaics, the molecular photo-cell is of interest being a paradigmatic example for a system that inherently operates in out-of-equilibrium conditions and typically far from the linear response regime. Moreover, this system includes electrons, phonons and photons and environments which induce coherent and incoherent processes, making it a challenging system to address theoretically. Here, using an open quantum systems approach, we analyze the non-equilibrium transport properties and energy conversion performance of a molecular photo-cell, including both coherent and incoherent processes and treating electrons, photons and phonons on an equal footing. We find that both the non-equilibrium conditions and decoherence play a crucial role in determining the performance of the photovoltaic conversion and the optimal energy configuration of the molecular system.
Building Damage-Resilient Dominating Sets in Complex Networks against Random and Targeted Attacks
Authors: Molnár F. , Derzsy N. , Szymanski B. K. , Korniss G. 
Published: February 2015

AbstractWe study the vulnerability of dominating sets against random and targeted node removals in complex networks. While small, cost-efficient dominating sets play a significant role in controllability and observability of these networks, a fixed and intact network structure is always implicitly assumed. We find that cost-efficiency of dominating sets optimized for small size alone comes at a price of being vulnerable to damage; domination in the remaining network can be severely disrupted, even if a small fraction of dominator nodes are lost. We develop two new methods for finding flexible dominating sets, allowing either adjustable overall resilience, or dominating set size, while maximizing the dominated fraction of the remaining network after the attack. We analyze the efficiency of each method on synthetic scale-free networks, as well as real complex networks.
Precise positioning with current multi-constellation Global Navigation Satellite Systems: GPS, GLONASS, Galileo and BeiDou
Authors: Li Xingxing , Zhang Xiaohong , Ren Xiaodong , Fritsche Mathias , Wickert Jens , Schuh Harald 
Published: February 2015

AbstractThe world of satellite navigation is undergoing dramatic changes with the rapid development of multi-constellation Global Navigation Satellite Systems (GNSSs). At the moment more than 70 satellites are already in view and about 120 satellites will be available once all four systems (BeiDou + Galileo + GLONASS + GPS) are fully deployed in the next few years. This will bring great opportunities and challenges for both scientific and engineering applications. In this paper we develop a four-system positioning model to make full use of all available observations from different GNSSs. The significant improvement of satellite visibility, spatial geometry, dilution of precision, convergence, accuracy, continuity and reliability that a combining utilization of multi-GNSS brings to precise positioning are carefully analyzed and evaluated, especially in constrained environments.
Sensory afferent segregation in three-eared frogs resemble the dominance columns observed in three-eyed frogs
Authors: Elliott Karen L. , Houston Douglas W. , Fritzsch Bernd 
Published: February 2015

AbstractThe formation of proper sensory afferent connections during development is essential for brain function. Activity-based competition is believed to drive ocular dominance columns (ODC) in mammals and in experimentally-generated three-eyed frogs. ODC formation is thus a compromise of activity differences between two eyes and similar molecular cues. To gauge the generality of graphical map formation in the brain, we investigated the inner ear projection, known for its well-defined and early segregation of afferents from vestibular and auditory endorgans. In analogy to three eyed-frogs, we generated three-eared frogs to assess to what extent vestibular afferents from two adjacent ears could segregate. Donor ears were transplanted either in the native orientation or rotated by 90 degrees. These manipulations should result in either similar or different induced activity between both ears, respectively. Three-eared frogs with normal orientation showed normal swimming whereas those with a rotated third ear showed aberrant behaviors. Projection studies revealed that only afferents from the rotated ears segregated from those from the native ear within the vestibular nucleus, resembling the ocular dominance columns formed in three-eyed frogs. Vestibular segregation suggests that mechanisms comparable to those operating in the ODC formation of the visual system may act on vestibular projection refinements.