output
19922026
Showing 2013 · astro-ph.GAShow all

30 papers · 2 filters

astro-ph.GA2013★ 116 cited

The Atlas3D project -- XXVII. Cold Gas and the Colours and Ages of Early-type Galaxies

L. M. Young, N. Scott, P. Serra +22

We present a study of the cold gas contents of the Atlas3D early-type galaxies, in the context of their optical colours, near-UV colours, and Hβ absorption line strengths. Early-ty…

astro-ph.GA2013★ 177 cited

Planck intermediate results. XVII. Emission of dust in the diffuse interstellar medium from the far-infrared to microwave frequencies

Planck Collaboration, A. Abergel, P. A. R. Ade +196

The dust-HI correlation is used to characterize the emission properties of dust in the diffuse interstellar medium. We cross-correlate sky maps from Planck, WMAP, and DIRBE, at 17…

astro-ph.GA2013★ 827 cited

Planck 2013 results. XI. All-sky model of thermal dust emission

Planck Collaboration, A. Abergel, P. A. R. Ade +244

This paper presents an all-sky model of dust emission from the Planck 857, 545 and 353 GHz, and IRAS 100 micron data. Using a modified black-body fit to the data we present all-sky…

astro-ph.GA2013★ 33 cited

A Direct Stellar Metallicity Determination in the Disk of the Maser Galaxy NGC4258

Rolf-Peter Kudritzki, Miguel A. Urbaneja, J. Zachary Gazak +4

We present the first direct determination of a stellar metallicity in the spiral galaxy NGC4258 (D=7.6 Mpc) based on the quantitative analysis of a low-resolution (~5 AE) Keck LRIS…

astro-ph.GA2013★ 129 cited

Cosmic rays can drive strong outflows from gas-rich high-redshift disk galaxies

Michal Hanasz, Harald Lesch, Thorsten Naab +3

We present simulations of the magnetized interstellar medium (ISM) in models of massive star forming (40 Msun / yr) disk galaxies with high gas surface densities (~100 Msun / pc^2)…

astro-ph.GA2013★ 166 cited

On the evolution of the density pdf in strongly self-gravitating systems

Philipp Girichidis, Lukas Konstandin, Anthony P. Whitworth +1

The time evolution of the probability density function (PDF) of the mass density is formulated and solved for systems in free-fall using a simple appoximate function for the collap…

astro-ph.GA2013★ 45 cited

N-body simulations of globular clusters in tidal fields: Effects of intermediate-mass black holes

Nora Lützgendorf, Holger Baumgardt, J. M. Diederik Kruijssen

Intermediate-mass black holes (IMBHs) may provide the missing link to understanding the growth of supermassive black holes in the early Universe. Some formation scenarios predict t…

astro-ph.GA2013★ 5 cited

Planck intermediate results. XV. A study of anomalous microwave emission in Galactic clouds

Planck Collaboration, P. A. R. Ade, N. Aghanim +180

Anomalous microwave emission (AME) is believed to be due to electric dipole radiation from small spinning dust grains. The aim of this paper is a statistical study of the basic pro…

astro-ph.GA2013★ 314 cited

Gaia FGK Benchmark Stars - Metallicity

Paula Jofre, U. Heiter, C. Soubiran +22

To calibrate automatic pipelines that determine atmospheric parameters of stars, one needs a sample of stars -- ``benchmark stars'' -- with well defined parameters to be used as a…

astro-ph.GA2013★ 102 cited

Studying Galactic interstellar turbulence through fluctuations in synchrotron emission: First LOFAR Galactic foreground detection

M. Iacobelli, M. Haverkorn, E. Orrú +85

The characteristic outer scale of turbulence and the ratio of the random to ordered components of the magnetic field are key parameters to characterise magnetic turbulence in the i…

astro-ph.GA2013★ 54 cited

Strong magnetic fields and large rotation measures in protogalaxies by supernova seeding

Alexander M. Beck, Klaus Dolag, Harald Lesch +1

We present a model for the seeding and evolution of magnetic fields in protogalaxies. Supernova (SN) explosions during the assembly of a protogalaxy provide magnetic seed fields, w…

astro-ph.GA2013★ 90 cited

Galactic abundance gradients from Cepheids: alpha and heavy elements in the outer disk

B. Lemasle, P. Francois, K. Genovali +11

Context: Galactic abundance gradients set strong constraints to chemo-dynamical evolutionary models of the Milky Way. Given the PL relations that provide accurate distances and the…

astro-ph.GA2013★ 282 cited

The AGORA High-Resolution Galaxy Simulations Comparison Project

Ji-hoon Kim, Tom Abel, Oscar Agertz +43

We introduce the AGORA project, a comprehensive numerical study of well-resolved galaxies within the LCDM cosmology. Cosmological hydrodynamic simulations with force resolutions of…

astro-ph.GA2013★ 80 cited

Planck intermediate results. XIV. Dust emission at millimetre wavelengths in the Galactic plane

Planck Collaboration, P. A. R. Ade, N. Aghanim +190

We use Planck HFI data combined with ancillary radio data to study the emissivity index of the interstellar dust emission in the frequency range 10 - 353 GHz, or 3 - 0.8 mm, in the…

astro-ph.GA2013★ 55 cited

Streams in the Aquarius stellar haloes

Facundo A. Gómez, Amina Helmi, Andrew P. Cooper +3

We use the very high resolution, fully cosmological simulations from the Aquarius project, coupled to a semi-analytical model of galaxy formation, to study the phase-space distribu…

astro-ph.GA2013★ 134 cited

Unveiling the corona of the Milky Way via ram-pressure stripping of dwarf satellites

A. Gatto, F. Fraternali, J. I. Read +3

The spatial segregation between dSphs and dIrrs in the Local Group has long been regarded as evidence of an interaction with their host galaxies. In this paper, we assume that ram-…

astro-ph.GA2013★ 94 cited

Clumps and triggered star formation in ionised molecular clouds

S. Walch, A. P. Whitworth, T. G. Bisbas +2

Infrared shells and bubbles are ubiquitous in the Galaxy and can generally be associated with HII regions formed around young, massive stars. In this paper, we use high-resolution…

astro-ph.GA2013★ 56 cited

Numerical simulations of the possible origin of the two sub-parsec scale and counter-rotating stellar disks around SgrA*

C. Alig, M. Schartmann, A. Burkert +1

We present a high resolution simulation of an idealized model to explain the origin of the two young, counter-rotating, sub-parsec scale stellar disks around the supermassive black…

astro-ph.GA2013★ 31 cited

Empirical Constraints on the Star Formation & Redshift Dependence of the Lyman Alpha `Effective' Escape Fraction

Mark Dijkstra, Akila Jeeson-Daniel

We derive empirical constraints on the volume averaged `effective' escape fraction of Lyman Alpha (Lya) photons from star forming galaxies as a function of redshift, by comparing s…

astro-ph.GA2013★ 114 cited

Analytical theory for the initial mass function: III time dependence and star formation rate

Patrick Hennebelle, Gilles Chabrier

The present paper extends our previous theory of the stellar initial mass function (IMF) by including the time-dependence, and by including the impact of magnetic field. The predic…

astro-ph.GA2013★ 143 cited

Candidate super star cluster progenitor gas clouds possibly triggered by close passage to Sgr A*

S. N. Longmore, J. M. D. Kruijssen, J. Bally +8

Super star clusters are the end product of star formation under the most extreme conditions. As such, studying how their final stellar populations are assembled from their natal pr…

astro-ph.GA2013★ 271 cited

Towards a more realistic population of bright spiral galaxies in cosmological simulations

Michael Aumer, Simon White, Thorsten Naab +1

We present an update to the multiphase SPH galaxy formation code by Scannapieco et al. We include a more elaborate treatment of the production of metals, cooling rates based on ind…

astro-ph.GA2013★ 221 cited

Planck 2013 results. XIII. Galactic CO emission

Planck Collaboration, P. A. R. Ade, N. Aghanim +238

Rotational transition lines of CO play a major role in molecular radio astronomy and in particular in the study of star formation and the Galactic structure. Although a wealth of d…

astro-ph.GA2013★ 39 cited

Measuring the slopes of mass profiles for dwarf spheroidals in triaxial CDM potentials

Chervin F. P. Laporte, Matthew G. Walker, Jorge Peñarrubia

We generate stellar distribution functions (DFs) in triaxial haloes in order to examine the reliability of slopes inferred by applying mass es…