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Using data from the WISE mission, we have measured near infra-red (NIR) photometry of a diverse sample of dust-free stellar systems (globular clusters, dwarf and giant early-type galaxies) which have metallicities that span the range -2.2 <…

Astrophysics of Galaxies · Physics 2015-06-22 Mark A. Norris , Sharon Meidt , Glenn Van de Ven , Eva Schinnerer , Brent Groves , Miguel Querejeta

We develop a new empirical methodology to study the relation between the stellar mass of galaxies and the mass of their host subhaloes. Our approach is similar to abundance matching, and is based on assigning a stellar mass to each subhalo…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-27 Eyal Neistein , Cheng Li , Sadegh Khochfar , Simone M. Weinmann , Francesco Shankar , Michael Boylan-Kolchin

The majority of observed mass-to-light ratios of globular clusters are too low to be explained by `canonical' cluster models, in which dynamical effects are not accounted for. Moreover, these models do not reproduce a recently reported…

Astrophysics · Physics 2009-11-13 J. M. Diederik Kruijssen

We introduce a model Galactic field low-mass stellar population that has a proportion of binary systems as observed, with a mass ratio distribution consistent with observational constraints. The model single star and system luminosity…

Astrophysics · Physics 2009-10-28 Pavel Kroupa

We use a large sample of galaxies from the Two Micron All Sky Survey (2MASS) and the Sloan Digital Sky Survey (SDSS) to calculate galaxy luminosity and stellar mass functions in the local Universe. We estimate k-corrections, evolution…

Astrophysics · Physics 2011-05-05 Eric F. Bell , Daniel H. McIntosh , Neal Katz , Martin D. Weinberg

(Abridged) We introduce a novel technique to construct spatially resolved maps of stellar mass surface density in galaxies based on optical and near IR imaging. We use optical/NIR colour(s) to infer effective stellar mass-to-light ratios…

Cosmology and Nongalactic Astrophysics · Physics 2011-03-28 Stefano Zibetti , Stephane Charlot , Hans-Walter Rix

We have obtained near-infrared imaging of 58 galaxy groups, in the redshift range 0.1<z<0.6, from the William Herschel Telescope and from the Spitzer IRAC data archive. The groups are selected from the CNOC2 redshift survey, with additional…

The current status of both the observational evidence and the theory of the stellar initial mass function (IMF) is reviewed, with particular attention to the two basic, apparently universal features shown by all observations of nearby…

Astrophysics · Physics 2007-05-23 Richard B. Larson

The relationship between stellar populations and the ionizing flux with which they irradiate their surroundings has profound implications for the evolution of the intergalactic medium. We quantify the ionizing flux arising from synthetic…

Astrophysics of Galaxies · Physics 2015-12-23 E. R. Stanway , J. J. Eldridge , G. D. Becker

The variation of the mass-to-light ratios M/L of early type galaxies as function of their luminosities L is investigated. It is shown that the tilt beta=0.27 (in the B--band) of the fundamental plane relation M/L ~ L^{beta} can be…

Astrophysics · Physics 2009-11-10 I. Trujillo , A. Burkert , Eric. F. Bell

The amount of mass contained in low-mass objects is investigated anew. Instead of using a mass-luminosity relation to convert a luminosity function to a mass function, I predict the mass-luminosity relation from assumed mass functions and…

Astrophysics · Physics 2009-10-30 James Binney

Total mass-to-light ratio M/L_B for S0 - Irr galaxies, where M is the dynamical mass within the optical radius R_25, increases systematically with (B-V)_0 color, but slower than that is predicted by stellar population evolution models. It…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-13 A. S. Saburova , E. S. Shaldenkova , A. V. Zasov

The purpose of this letter is to compare the quality of different methods for estimating stellar masses of galaxies. We compare the results of (a) fitting stellar population synthesis models to broad band colors from SDSS and 2MASS, (b) the…

Astrophysics · Physics 2009-11-10 N. Drory , R. Bender , U. Hopp

We determine the importance of redshift-dependent systematic effects in the determination of stellar masses from broad band spectral energy distributions (SEDs), using high quality kinematic and photometric data of early-type galaxies at…

Alternative gravitations of Milgrom (MOND), Moffat (MOG), and CDM scenarios all simulate rotation curves of spirals with reasonable details. They display significant disparities however in predicting the stellar mass-to-light ($M_*/L$)…

Astrophysics of Galaxies · Physics 2015-05-19 Akram Hasani Zonoozi , Hosein Haghi

In this letter we describe how we use stellar dynamics information to constrain the shape of the stellar IMF in a sample of 27 early-type galaxies from the CALIFA survey. We obtain dynamical and stellar mass-to-light ratios,…

We present a simple technique to estimate mass-to-light (M/L) ratios of stellar populations based on two broadband photometry measurements, i.e. a color-M/L relation. We apply the color-M/L relation to galaxy rotation curves, using a large…

Astrophysics · Physics 2007-05-23 Roelof S. de Jong , Susan Kassin , Eric F. Bell , Stephane Courteau

We compare estimates of stellar mass, Mstar, and dynamical mass,Mdyn,for a sample of galaxies from the Sloan Digital Sky Survey (SDSS). We assume dynamical homology (i.e., Mdyn = dispersion**2 * Reff, and we find a tight but strongly…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-19 Edward N Taylor , Marijn Franx , Jarle Brinchmann , Arjen van der Wel , Pieter G. van Dokkum

We present the results of a comprehensive analysis of the structure and kinematics of six Galactic globular clusters. By comparing the results of the most extensive photometric and kinematical surveys available to date with suited dynamical…

Astrophysics of Galaxies · Physics 2015-06-05 A. Sollima , M. Bellazzini , J. -W. Lee

Using a sample of nine massive compact galaxies at z ~ 2.3 with rest-frame optical spectroscopy and comprehensive U through 8um photometry we investigate how assumptions in SED modeling change the stellar mass estimates of these galaxies,…

Astrophysics of Galaxies · Physics 2014-11-20 Adam Muzzin , Pieter van Dokkum , Marijn Franx , Danilo Marchesini , Mariska Kriek , Ivo Labbé