Mathematics – Logic
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21333506m&link_type=abstract
American Astronomical Society, AAS Meeting #213, #335.06; Bulletin of the American Astronomical Society, Vol. 41, p.397
Mathematics
Logic
Scientific paper
We study internal kinematics (velocity dispersion, σ) and properties of underlying stellar populations of the dwarf early-type galaxies (dE/dS0s) in the Coma cluster. Our data include a total of 140 dwarf and intermediate early-type galaxies in the center of the cluster and a region of lower density believed to be infalling into the cluster. We determine that the L-velocity dispersion relation for the dE/dS0 galaxies is different from the canonical Faber-Jackson relation, L σ^4, followed by massive elliptical galaxies. We find that dE/dS0 galaxies in the Coma cluster follow a relation where L σ^2. We also show that this change of slope cannot be explained by rotation, or with inclusion of other morphological types. We used stellar population models and line strengths to derive ages, metallicities and abundances of α-elements, of the Coma cluster dEs/dS0s. We confirm that dE/dS0 galaxies in the center of Coma show a wide range in ages, relatively low metallicities and solar to sub-solar α-ratios. On the other hand, dE/dS0s in the region of lower density within the cluster are on average younger, have lower metallicities and surprisingly higher α-ratios. High [α/Fe] suggests short time scales for the star formation histories for these galaxies. Further, the dE/dS0s with high α-ratios have a range of ages and metallicities implying multiple formation scenarios where some galaxies have experienced their short star formation bursts at more recent epochs.
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