Journal Article

The satellite luminosity functions of galaxies in Sloan Digital Sky Survey

Quan Guo, Shaun Cole, Vincent Eke and Carlos Frenk

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 417, issue 1, pages 370-381
Published in print October 2011 | ISSN: 0035-8711
Published online October 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.19270.x
The satellite luminosity functions of galaxies in Sloan Digital Sky Survey

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We study the luminosity function of satellite galaxies around isolated primaries using the Sloan Digital Sky Survey (SDSS) spectroscopic and photometric galaxy samples. We select isolated primaries from the spectroscopic sample and search for potential satellites in the much deeper photometric sample. For primaries of similar luminosity to the Milky Way and M31, we are able to stack as many as ∼20 000 galaxy systems to obtain robust statistical results. We derive the satellite luminosity function extending almost 8 mag fainter than the primary galaxy. We also determine how the satellite luminosity function varies with the luminosity, colour and concentration of the primary. We find that, in the mean, isolated primaries of comparable luminosity to the Milky Way and M31 contain about a factor of 2 fewer satellites brighter than MV=−14 than the average of the Milky Way and M31.

Keywords: galaxies: dwarf; galaxies: fundamental parameters; Local Group; galaxies: luminosity function, mass function; galaxies: structure

Journal Article.  8146 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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