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Early-type galaxies in the Coma Cluster: A new piece in the calcium puzzle

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Cenarro, A. J. and Sánchez Blázquez, Patricia and Cardiel López, Nicolás and Gorgas García, Francisco Javier (2004) Early-type galaxies in the Coma Cluster: A new piece in the calcium puzzle. Astrophysical journal, 614 (2). L101-L104. ISSN 0004-637X

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Official URL: http://dx.doi.org/10.1086/425862




Abstract

We present measurements of the Ca II triplet and the Ca4227 Lick index for a sample of early-type galaxies in the Coma Cluster, deriving, for the first time, their corresponding relationships with velocity dispersion. Compared with a similar subsample of elliptical galaxies in the field, Coma galaxies with velocity dispersions in the range approximate to180-270 km s(-1) exhibit significant differences in the strengths of the Ca features, suggesting an influence of the environment on the star formation histories of these galaxies. We argue that the main scenarios previously proposed to explain the relatively low Ca II triplet of galaxies are not able by themselves to simultaneously reconcile the strengths of the two Ca indices in both environments.


Item Type:Article
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© 2004. The American Astronomical Society. All rights reserved. The authors are indebted to the referee, S. M. Faber, for useful comments and suggestions. A. J. C. acknowledges financial support from a Universidad Complutense de Madrid Fundación del Amo Fellowship. The William Herschel Telescope is operated on the island of La Palma by the Royal Greenwich Observatory at the Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias. This work was supported by the Spanish research project AYA2003-01840.

Uncontrolled Keywords:Infrared caII triplet; Stellar population synthesis; Color-magnitude relation; Elliptic galaxies; Empirical calibration; Globular-clusters; II triplet; Absorption; Abundances; Spheroids
Subjects:Sciences > Physics > Astrophysics
Sciences > Physics > Astronomy
Sciences > Physics > Atmospheric physics
ID Code:29351
Deposited On:13 Apr 2015 10:11
Last Modified:10 Dec 2018 15:05

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