Very deep spectroscopy of the Coma cluster line of sight: exploring new territories

Details Very deep spectroscopy of the Coma cluster line of sight: exploring new territories Very deep spectroscopy of the Coma cluster line of sight: exploring new territories

2009-06-24

arxiv.org/abs/0906.4443v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Accepted for publication in Astronomy & Astrophysics

Scientific paper

Environmental effects have an important influence on cluster galaxies, but studies at very faint magnitudes (R>21) are almost exclusively based on imaging. We present here a very deep spectroscopic survey of galaxies on the line of sight to Coma, based on redshifts obtained with VLT/VIMOS for 715 galaxies in the unprecedented magnitude range 2122 galaxies. This trend is less clear for field galaxies, suggesting that part of the faint Coma galaxies could have been recently injected from the field following the NGC 4911 group infall. We present a list of five Ultra Compact Dwarf galaxy candidates. We also globally confirm spectroscopically our previous results on the galaxy luminosity functions and find that dwarf galaxies follow a red sequence similar to that drawn by bright galaxies. Dwarf galaxies are very abundant in Coma, and are partly field galaxies that have fallen onto the cluster along filaments.

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