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Effect of Environment on the Underlying Stellar Populations of Dwarf Elliptical Galaxies in the Coma Cluster

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Matkovic, A. and Guzmán, R. and Sánchez Blázquez, P. and Cardiel López, Nicolás and Gorgas García, Francisco Javier (2009) Effect of Environment on the Underlying Stellar Populations of Dwarf Elliptical Galaxies in the Coma Cluster. AIP Conference Proceedings, 1111 . pp. 23-26. ISSN 0094-243X

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Official URL: http://link.aip.org/link/?APCPCS/1111/23/1


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Abstract

We derive ages, metallicities and [alpha/Fe] ratios for dwarf early-type galaxies (dE/dS0) in the center and a region believed to be infalling into the Coma cluster. We find that a set of metallic indices cannot be described by linear relations with velocity dispersion (sigma), while another group of indices exhibits linear index-sigma relations. dE/dS0 galaxies in the core of the cluster are on average younger, and have lower metallicities and lower alpha-ratios (solar to sub-solar) than the more luminous elliptical galaxies. On the other hand, dEs/dSos in the infall region of Coma form a less homogeneous population. We find an unusually high fraction of dE/dS0s with high [alpha/Fe] ratios, suggesting short time scales for the star formation histories for these galaxies. Furthermore, the dE/dS0s with high alpha-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.


Item Type:Article
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© 2009 American Institute of Phiysics. International Conference on Probing Stellar Populations out to the Distant Universe (2008. Cefalu, Italy). I thank the SOC for financial support to attend the conference.

Uncontrolled Keywords:Indexes; Matter
Subjects:Sciences > Physics > Astrophysics
Sciences > Physics > Astronomy
Sciences > Physics > Atmospheric physics
ID Code:28201
Deposited On:06 Feb 2015 09:45
Last Modified:10 Dec 2018 15:05

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