THE STELLAR-SUBHALO MASS RELATION OF SATELLITE GALAXIES

We extend the abundance matching technique (AMT) to infer the satellite-sub-halo and central-halo mass relations (MRs) of local galaxies as well as the corresponding satellite conditional mass functions (CSMFs). We use as inputs the observed galaxy stellar mass function (GSMF) decomposed into centra...

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Bibliographic Details
Published in:The Astrophysical journal 2012-09, Vol.756 (1), p.1-11
Main Authors: Rodriguez-Puebla, A, Drory, N, Avila-Reese, V
Format: Article
Language:English
Subjects:
Abundance
Accretion
Galactic halos
Galaxies
Halos
Satellites
Slopes
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Summary:We extend the abundance matching technique (AMT) to infer the satellite-sub-halo and central-halo mass relations (MRs) of local galaxies as well as the corresponding satellite conditional mass functions (CSMFs). We use as inputs the observed galaxy stellar mass function (GSMF) decomposed into centrals and satellites and the [Lambda]CDM distinct halo and sub-halo mass functions. We explore the effects of defining the sub-halo mass, m[subsub], at the time of (sub) halo accretion (m[[supacc][subsub]]) versus defining it at the time of observation (m[[supobs][subsub]]); we also test the standard assumption that centrals and satellites follow the same Mrs We show that the use of m[[supobs][subsub]] leads to less uncertain MRs than m[[supacc][subsub]] and discuss some implications of the obtained satellite-sub-halo MR. For example, we show that the tension between abundance and dynamics of Milky Way satellites in the [Lambda]CDM cosmogony gives a value of ~ -1.6 in the faint-end slope of the GSMF upturns.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/756/1/2