Internal Kinematics, Ages and Metallicities of dE/dS0 Galaxies in the Coma Cluster

Details Internal Kinematics, Ages and Metallicities of dE/dS0 Galaxies in the Coma Cluster Internal Kinematics, Ages and Metallicities of dE/dS0 Galaxies in the Coma Cluster

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...207.8906m&link_type=abstract

American Astronomical Society Meeting 207, #89.06; Bulletin of the American Astronomical Society, Vol. 37, p.1317

Astronomy and Astrophysics

Astronomy

Scientific paper

We present velocity dispersion and line strength index measurements for ˜ 70 early--type galaxies in the core of the Coma cluster, including ˜ 40 dwarf galaxies (dE/dS0). The luminosity-velocity dispersion (L--σ ) relation for early--type galaxies in our sample exhibits a change of slope. Luminous early--type galaxies follow the canonical L ∝ σ 4 relation, while the slope of this relation for dE/dS0s is L ∝ σ 2. We investigate rotation as a possible cause for the change of slope, but find its effect to be negligible. Using line index measurements combined with stellar population synthesis models, we find that dE/dS0 galaxies in the center of the Coma cluster span a wide range both in age and in metallicity. We also discuss the presence of a number of old, very metal--poor dwarf galaxies in our sample.

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