The Satellite Luminosity Functions of Galaxies in SDSS

Understand

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 $\sim\negthinspace 20,000$ galaxy systems to obtain robust statistical results.
• We derive the satellite luminosity function extending almost 8 magnitudes fainter than the primary galaxy.