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Two Formation Paths for Cluster Dwarf Galaxies?

Published online by Cambridge University Press:  26 May 2016

Bianca M. Poggianti ,
Nobunari Kashikawa ,
Terry Bridges ,
Bahram Mobasher ,
Yutaka Komiyama ,
Dave Carter ,
Sadanori Okamura  and
Masafumi Yagi
Bianca M. Poggianti
Affiliation:
Osservatorio Astronomico di Padova-INAF, Italy
Nobunari Kashikawa
Affiliation:
National Astronomical Observatory, Mitaka, Tokyo, Japan
Terry Bridges
Affiliation:
Anglo-Australian Observatory, Australia
Bahram Mobasher
Affiliation:
Space Telescope Science Institute, Baltimore, USA
Yutaka Komiyama
Affiliation:
Department of Astronomy, University of Tokyo, Japan
Dave Carter
Affiliation:
Liverpool John Moores University, Birkenhead, Wirral, UK
Sadanori Okamura
Affiliation:
Department of Astronomy, University of Tokyo, Japan
Masafumi Yagi
Affiliation:
National Astronomical Observatory, Mitaka, Tokyo, Japan

Abstract

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A surprising result of our recent spectroscopic survey of galaxies in the Coma cluster has been the discovery of a possible bimodal distribution in the metallicities of faint galaxies at MB > −17. We identified a group of dwarfs with luminosity-weighted metallicities around solar and a group with [M/H] around −1.5. A metallicity bimodality among galaxies of similar luminosities is unexpected and suggests that faint cluster galaxies could be an heterogeneous population that formed through more than one evolutionary path, possibly as a consequence of the cluster environment.

Type
Part 4. Recycling
Information
Symposium - International Astronomical Union , Volume 217: Recycling Intergalactic and Interslettar Matter , 2004 , pp. 562 - 563
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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