Ultracompact dwarf galaxies in the Fornax Cluster

Phillipps, S., Drinkwater, M. J., Gregg, M. D. and Jones, J. B. (2001) Ultracompact dwarf galaxies in the Fornax Cluster. Astrophysical Journal, 560 1: 201-206. doi:10.1086/322517

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Author Phillipps, S.
Drinkwater, M. J.
Gregg, M. D.
Jones, J. B.
Title Ultracompact dwarf galaxies in the Fornax Cluster
Journal name Astrophysical Journal   Check publisher's open access policy
ISSN 0004-637X
Publication date 2001
Sub-type Article (original research)
DOI 10.1086/322517
Open Access Status File (Publisher version)
Volume 560
Issue 1
Start page 201
End page 206
Total pages 6
Place of publication Philadelphia, PA, United States
Publisher Institute of Physics Publishing
Language eng
Abstract By utilizing the large multiplexing advantage of the Two-degree Field spectrograph on the Anglo-Australian Telescope, we have been able to obtain a complete spectroscopic sample of all objects in a predefined magnitude range, 16.5 < b(j) < 19.7 regardless of morphology, in an area toward the center of the Fornax Cluster of galaxies. Among the unresolved or marginally resolved targets, we have found five objects that are actually at the redshift of the Fornax Cluster; i.e., they are extremely compact dwarf galaxies or extremely large star clusters. All five have absorption-line spectra. With intrinsic sizes of less than 1.1 HWHM (corresponding to approximately 100 pc at the distance of the cluster), they are more compact and significantly less luminous than other known compact dwarf galaxies, yet much brighter than any globular cluster. In this paper we present new ground-based optical observations of these enigmatic objects. In addition to having extremely high central surface brightnesses, these objects show no evidence of any surrounding low surface brightness envelopes down to much fainter limits than is the case for, e.g., nucleated dwarf elliptical galaxies. Thus, if they are not merely the stripped remains of some other type of galaxy, then they appear to have properties unlike any previously known type of stellar system.
Keyword Astronomy & Astrophysics
Virgo Cluster
Spectroscopic Survey
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Physical Sciences Publications
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Citation counts: TR Web of Science Citation Count  Cited 120 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 115 times in Scopus Article | Citations
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Created: Mon, 13 Aug 2007, 12:36:02 EST