The environmental dependence of the infrared luminosity and stellar mass functions

Citation
Ml. Balogh et al., The environmental dependence of the infrared luminosity and stellar mass functions, ASTROPHYS J, 557(1), 2001, pp. 117-125
Citations number
65
Categorie Soggetti
Space Sciences
Journal title
ASTROPHYSICAL JOURNAL
ISSN journal
0004637X → ACNP
Volume
557
Issue
1
Year of publication
2001
Part
1
Pages
117 - 125
Database
ISI
SICI code
0004-637X(20010810)557:1<117:TEDOTI>2.0.ZU;2-G
Abstract
We investigate the dependence of the galaxy infrared luminosity function (L F) and the associated stellar mass function (SMF) on environment and spectr al type using photometry from the Two Micron All Sky Survey and redshifts f rom the Las Campanas Redshift Survey for galaxies brighter than M-J < -19 5 log h. In the field environment, the LFs of galaxies with emission lines have much steeper faint-end slopes (<alpha>(J) = -1.39) than those of gala xies without emission lines (alpha (J) = -0.59). In the cluster environment , however, even the non-emission-line galaxies have a steep faint-end LF (a lpha (J) = -1.22). There is also a significant (95%) difference between the overall cluster and field LFs, Delta alpha (J) = -0.34 and DeltaM(J)* = -0 .54. All these variations are more pronounced in the SMFs, which we compute by relating the strength of the 4000 Angstrom break in the optical spectra to a stellar mass-to-light ratio.