Journal
ASTRONOMICAL JOURNAL
Volume 133, Issue 1, Pages 177-185Publisher
UNIV CHICAGO PRESS
DOI: 10.1086/509733
Keywords
cosmology : observations; galaxies : clusters : individual (Coma); galaxies : dwarf; galaxies : formation; galaxies : individual (NGC 4874); galaxies : luminosity function, mass function
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We present optical measurements of the faint end of the luminosity function in the core of the Coma Cluster. Dwarf galaxies are detected down to a limiting magnitude of R similar to 25: 75 in images taken with the Hubble Space Telescope. This represents the faintest determination of the Coma luminosity function to date. With the assumption that errors due to cosmic variance are small, evidence is found for a steep faint-end slope with alpha less than or similar to -2. Such a value is expected in theories in which reionization and other feedback processes are dependent on density.
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