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Low Luminosity Galaxies in Large Surveys

Published online by Cambridge University Press:  12 April 2016

John P. Huchra
John P. Huchra*
Affiliation:
Harvard-Smithsonian center for Astrophysics, 60 Garden Street, Cambridge, MA 02138-1516USA

Abstract

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The debate about the slope and amplitude of the galaxy luminosity function at the faint end is discussed w.r.t. faint galaxies in large surveys, in particular the second CfA (CfA2) and the Las Campanas (LCRS) redshift surveys. Large surveys are necessary to determine the statistics of rare objects or objects that can only be seen out to limited volumes. Both surveys show excesses of faint galaxies over Schechter function fits, but the parent sample for the LCRS survey generally does not contain large or low surface brightness galaxies which do appear in the CfA2 survey. The objects that comprise the relatively large excess of faint galaxies in the CfA2 survey are shown to be primarily of low surface brightness and late morphological type and are generally emission line galaxies. Galaxy samples constructed like the LCRS will generally always be deficient in low luminosity galaxies and thus are not useful for constraining the faint end of the galaxy luminosity function.

Type
Luminosity and surface brightness distributions
Information
International Astronomical Union Colloquium , Volume 171: The Low Surface Brightness Universe , 1999 , pp. 45 - 51
Copyright
Copyright © Astronomical Society of the Pacific 1999

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