Ultraviolet color-magnitude relation of early-type dwarf galaxies in the Virgo cluster

✍ Scribed by S. Kim; S.-C. Rey; T. Lisker

• Publisher: John Wiley and Sons
• Year: 2009
• Tongue: English
• Weight: 76 KB
• Volume: 330
• Category: Article
• ISSN: 0004-6337
• DOI: 10.1002/asna.200911286

✦ Synopsis

Abstract

We present ultraviolet (UV) color‐magnitude relations (CMRs) for dwarf ellipticals (dEs) and dwarf lenticulars (dS0s) in the Virgo cluster. We used the Galaxy Evolution Explorer (GALEX) GR3 photometric data in far‐ultraviolet (FUV) and near‐ultraviolet (NUV) passbands combined with SDSS DR5 data. We found that dS0s as well as peculiar dEs (dEs with blue center and disk) found by Lisker et al. (2006a, b) show distinct locus from that of ordinary dEs in UV CMRs. The dS0s and peculiar dEs have bluer UV colors than ordinary dEs at a fixed optical luminosity. Furthermore, UV colors of dEs in outer region of the cluster are systematically bluer than those in inner region. Since UV flux is sensitive to the presence of young stellar population from recent star formation activity, our results suggest that there are different star formation histories among different subsample of early‐type dwarf galaxies in Virgo cluster concerning their morphology and environmental effect (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)