The Luminosity Function of the Coma Cluster Core for -25<M_R<-11

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Submitted to AJ. Self-unpacking version of AASTeX source for 45p text and Postscript for Figures 3--8. Compressed postscript o

Scientific paper

10.1086/117624

We determine the luminosity function (LF) of galaxies in the core of the Coma cluster for M_R<=-11.4 (assuming H_0=75 km/s/Mpc), a magnitude regime previously explored only in the Local Group. Objects are counted in a deep CCD image of Coma having RMS noise of 27.7 R mag~arcsec$^{-2}$. A correction for objects in the foreground or background of the Coma cluster---and the uncertainty in this correction---are determined from images of five other high-latitude fields, carefully matched to the Coma image in both resolution and noise level. Accurate counts of Coma cluster members are obtained as faint as R=25.5, or M_R=-9.4. The LF for galaxies is well fit by a power law dN/dL\propto L^\alpha, with \alpha=-1.42\pm0.05, over the range -19.4

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