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LINER-like emission in red galaxies: evolutionary phase or recurring phenomenon?

Published online by Cambridge University Press:  01 July 2007

Genevieve J. Graves
Genevieve J. Graves*
Affiliation:
UCO/Lick Observatory, 1156 High Street, Santa Cruz, CA 95060, USA email: graves@ucolick.org
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Abstract

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We present recent results showing that a large fraction of red sequence galaxies contain ionized gas with LINER-like optical emission line ratios. This emission is more frequently found in galaxies with lower central velocity dispersion (σ) and these galaxies typically have younger mean ages than galaxies at the same σ which do not host emission. We suggest that the presence of LINER-like emission may be determined by the quantity of interstellar material in these galaxies and may be associated with the recent accretion of a gas-rich satellite galaxy or alternatively with stellar mass loss that declines as the galaxy stellar population ages.

Keywords

galaxies: stellar contentgalaxies: activegalaxies: bulges
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S245: Formation and Evolution of Galaxy Bulges , July 2007 , pp. 181 - 184
Copyright
Copyright © International Astronomical Union 2008

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