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2dF Spectroscopy of Globular Clusters in M104

Published online by Cambridge University Press:  30 March 2016

Terry Bridges ,
Steve Zepf ,
Katherine Rhode  and
Ken Freeman
Terry Bridges
Affiliation:
Anglo-Australian Observatory; Michigan State University; Yale University; Australian National University
Steve Zepf
Affiliation:
Anglo-Australian Observatory; Michigan State University; Yale University; Australian National University
Katherine Rhode
Affiliation:
Anglo-Australian Observatory; Michigan State University; Yale University; Australian National University
Ken Freeman
Affiliation:
Anglo-Australian Observatory; Michigan State University; Yale University; Australian National University

Abstract

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We have found 56 new globular clusters in M104 from 2dF multi-fiber spectroscopy, doubling the number of confirmed clusters, and extending the spatial coverage to 50 kpc radius. We find no significant rotation in the total sample, or for subsets split by color or radius. However, there are hints that the blue clusters have a higher rotation than the red clusters, and for counter-rotation of clusters at large radius. We find a total mass of M ~ 1 × 1012M⊙ and a (M/L)B =30 out to 50 kpc radius, which is strong evidence for a dark matter halo in M104.

Type
JD6: Extragalactic Globular Clusters & Their Host Galaxies
Information
Highlights of Astronomy , Volume 13 , 2005 , pp. 199
Copyright
Copyright © Astronomical Society of Pacific 2005