The Luminosity Function of Galaxies in the Las Campanas Redshift Survey

Abstract

We present the $R$-band luminosity function for a sample of 18678 galaxies, with average redshift $z=0.1$, from the Las Campanas Redshift Survey. The luminosity function may be fit by a Schechter function with $M^{\ast }=-20.29\pm 0.02+5\log h$, $\alpha =-0.70\pm 0.05$, and ${\varphi }^{\ast }=0.019\pm 0.001h^3$~Mpc${}^{-3}$, for absolute magnitudes $-23.0\le M-5\log h\le -17.5$. We compare our luminosity function to that from other redshift surveys; in particular our normalization is consistent with that of the Stromlo-APM survey, and is therefore a factor of two below that implied by the $b_J\approx 20$ bright galaxy counts. Our normalization thus indicates that much more evolution is needed to match the faint galaxy count data, compared to minimal evolution models which normalize at $b_J\approx 20$. Also, we show that our faint-end slope $\alpha =-0.7$, though ``shallower'' than typical previous values $\alpha =-1$, results primarily from fitting the detailed shape of the LCRS luminosity function, rather than from any absence of intrinsically faint galaxies from our survey. Finally, using [OII] 3727 equivalent width $W_{\lambda }=5$~Å\ as the dividing line, we find significant differences in the luminosity functions of emission and non-emission galaxies, particularly in their $\alpha$ values. Emission galaxies have Schechter parameters $M^{\ast }=-20.03\pm 0.03+5\log h$ and $\alpha =-0.9\pm 0.1$, while non-emission galaxies are described by $M^{\ast }=-20.22\pm 0.02+5\log h$ and $\alpha =-0.3\pm 0.1$. (abridged abstract)

arXiv comment41 pages, including 13 postscript figures, uses AASTEX v4.0 style files. Important clarification of R-band definition, plus correction of luminosity densities and updated references. Main conclusions unchanged. Final version to appear in ApJ

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