Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-04-03
Astronomy and Astrophysics
Astrophysics
14 pages, 13 figures, emulateapj style ApJ, post-referee. Very minor changes, mostly typographical in nature
Scientific paper
10.1086/321670
We investigate the dependence of the galaxy infrared luminosity function (LF) and the associated stellar mass function (SMF) on environment and spectral type using photometry from the Two Micron All Sky Survey and redshifts from the Las Campanas Redshift Survey for galaxies brighter than M_J<-19+5 log h. In the field environment, galaxies with emission lines have LFs with much steeper faint end slopes (alpha_J=-1.39) than galaxies without emission lines (alpha_J=-0.59). In the cluster environment, however, even the non-emission line galaxies have a steep faint-end LF (alpha_J=-1.22). There is also a significant (95%) difference between the overall cluster and field LFs, $\Delta \alpha_J=-0.34, \Delta M_J^\ast=-0.54$. All of these variations are more pronounced in the SMFs, which we compute by relating the strength of the 4000 A break in the optical spectra to a mass-to-light ratio.
Balogh Michael
Christlein Daniel
Zabludoff Ann
Zaritsky Dennis
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