SIMBAD references

2005MNRAS.362..289M - Mon. Not. R. Astron. Soc., 362, 289-300 (2005/September-1)

Kinematic properties and stellar populations of faint early-type galaxies - I. Velocity dispersion measurements of central Coma galaxies.


Abstract (from CDS):

We present velocity dispersion measurements for 69 faint early-type galaxies in the core of the Coma cluster, spanning -22.0 ≲MR≲-17.5 mag. We examine the L-σ relation for our sample and compare it to that of bright elliptical galaxies (Es) from the literature. The distribution of the the faint early-type galaxies in the L-σ plane follows the relation L∝σ2.01±0.36, which is significantly shallower from L∝σ4 as defined for the bright Es. While increased rotational support for fainter early-type galaxies could account for some of the difference in slope, we show that it cannot explain it. We also investigate the colour-σ relation for our Coma galaxies. Using the scatter in this relation, we constrain the range of galaxy ages as a function of their formation epoch for different formation scenarios. Assuming a strong coordination in the formation epoch of faint early-type systems in Coma, we find that most had to be formed at least 6 Gyr ago and over a short 1-Gyr period.

Abstract Copyright: 2005 RAS

Journal keyword(s): galaxies: clusters: individual: Coma - galaxies: dwarf - galaxies: elliptical and lenticular, cD - galaxies: formation - galaxies: kinematics and dynamics

Simbad objects: 89

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