UCDS IN THE COMA CLUSTER

K. Chiboucas*, R. Brent Tully, R. O. Marzke, S. Phillipps, J. Price, E. W. Peng, N. Trentham, D. Carter, D. Hammer

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

Abstract

As part of the HST/ACS Coma Cluster Treasury Survey, we have undertaken a Keck/LRIS spectroscopic campaign to determine membership for faint dwarf galaxies. In the process, we discovered a population of Ultra Compact Dwarf galaxies (UCDs) in the core region of the Coma Cluster. At the distance of Coma, UCDs are expected to have angular sizes 0.01 <R-e <0.2 arcsec. With ACS imaging, we can resolve all but the smallest ones with careful fitting. Candidate UCDs were chosen based on magnitude, color, and degree of resolution. We spectroscopically confirm 27 objects as bona fide UCD members of the Coma Cluster, a 60% success rate for objects targeted with M-R <-12. We attribute the high success rate in part to the high resolution of HST data and to an apparent large population of UCDs in Coma. We find that the UCDs tend to be strongly clustered around giant galaxies, at least in the core region of the cluster, and have a distribution and colors that are similar to globular clusters. These findings suggest that UCDs are not independent galaxies, but rather have a star cluster origin.

Original languageEnglish
Title of host publicationCRAL-2010: A UNIVERSE OF DWARF GALAXIES
EditorsM Koleva, P Prugniel, Vauglin
Place of PublicationCEDEX A
PublisherE D P Sciences
Pages225-230
Number of pages6
ISBN (Print)978-2-7598-0662-1
DOIs
Publication statusPublished - 2011
EventConference on a Universe of Dwarf Galaxies - Lyon, France
Duration: 14 Jun 201018 Jun 2010

Publication series

NameEAS Publications Series
PublisherE D P SCIENCES
Volume48
ISSN (Print)1633-4760

Conference

ConferenceConference on a Universe of Dwarf Galaxies
CountryFrance
Period14/06/1018/06/10

Keywords

  • COMPACT DWARF GALAXIES
  • MASSIVE STAR-CLUSTERS
  • STELLAR-SYSTEMS
  • FORNAX CLUSTER
  • ORIGIN

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