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Title:
The Nature of the Density Clump in the Fornax Dwarf Spheroidal Galaxy
Authors:
Olszewski, Edward W.; Mateo, Mario; Harris, Jason; Walker, Matthew G.; Coleman, Matthew G.; Da Costa, G. S.
Affiliation:
AA(Steward Observatory, The University of Arizona, Tucson, AZ 85721; ), AB(Department of Astronomy, University of Michigan, 830 Dennison Building, Ann Arbor, MI 48109-1090 ), AC(Steward Observatory, The University of Arizona, Tucson, AZ 85721; ), AD(Department of Astronomy, University of Michigan, 830 Dennison Building, Ann Arbor, MI 48109-1090 ), AE(Research School of Astronomy and Astrophysics, Institute of Advanced Studies, Australian National University, Cotter Road, Weston Creek, ACT 2611, Australia; , ), AF(Research School of Astronomy and Astrophysics, Institute of Advanced Studies, Australian National University, Cotter Road, Weston Creek, ACT 2611, Australia; , )
Publication:
The Astronomical Journal, Volume 131, Issue 2, pp. 912-921. (AJ Homepage)
Publication Date:
02/2006
Origin:
UCP
AJ Keywords:
Galaxies: Dwarf, galaxies: individual (Fornax dSph), Galaxies: Stellar Content, Galaxies: Local Group
DOI:
10.1086/498895
Bibliographic Code:
2006AJ....131..912O

Abstract

We have imaged the recently discovered stellar overdensity located approximately one core radius from the center of the Fornax dwarf spheroidal galaxy using the Magellan Clay 6.5 m telescope with the Magellan Instant Camera. Superb seeing conditions allowed us to probe the stellar populations of this overdensity and of a control field within Fornax to a limiting magnitude of R=26. The color-magnitude diagram of the overdensity field is virtually identical to that of the control field, with the exception of the presence of a population arising from a very short (less than 300 Myr in duration) burst of star formation 1.4 Gyr ago. Coleman et al. have argued that this overdensity might be related to a shell structure in Fornax that was created when Fornax captured a smaller galaxy. Our results are consistent with this model, but we argue that the metallicity of this young component favors a scenario in which the gas was part of Fornax itself.
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