Very deep spectroscopy of the Coma cluster line of sight: exploring new territories - Astrophysics > Cosmology and Nongalactic AstrophysicsReportar como inadecuado




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Abstract: Environmental effects have an important influence on cluster galaxies, butstudies at very faint magnitudes R>21 are almost exclusively based onimaging. We present here a very deep spectroscopic survey of galaxies on theline of sight to Coma, based on redshifts obtained with VLT-VIMOS for 715galaxies in the unprecedented magnitude range 2122 galaxies. This trend is less clearfor field galaxies, suggesting that part of the faint Coma galaxies could havebeen recently injected from the field following the NGC 4911 group infall. Wepresent a list of five Ultra Compact Dwarf galaxy candidates. We also globallyconfirm spectroscopically our previous results on the galaxy luminosityfunctions and find that dwarf galaxies follow a red sequence similar to thatdrawn by bright galaxies. Dwarf galaxies are very abundant in Coma, and arepartly field galaxies that have fallen onto the cluster along filaments.



Autor: C. Adami, V. Le Brun, A. Biviano, F. Durret, F. Lamareille, R. Pello, O. Ilbert, A. Mazure, R. Trilling, M.P. Ulmer

Fuente: https://arxiv.org/



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