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Globular Clusters as Probes of the Virgo gE NGC 4472

Published online by Cambridge University Press:  26 May 2016

Terry Bridges ,
Keith Ashman ,
Mike Beasley ,
Doug Geisler ,
Dave Hanes ,
Ray Sharpies  and
Steve Zepf
Terry Bridges
Affiliation:
1Anglo-Australian Observatory
Keith Ashman
Affiliation:
2University of Kansas
Mike Beasley
Affiliation:
3University of Durham
Doug Geisler
Affiliation:
4Concepcion University
Dave Hanes
Affiliation:
5Queen's University
Ray Sharpies
Affiliation:
3University of Durham
Steve Zepf
Affiliation:
6Yale

Abstract

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We present radial velocities for 144 globular clusters (GCs) around the Virgo gE NGC 4472 (M49), and ages and metallicities for 131 GCs. We confirm our earlier finding that the metal-poor GCs have a significantly higher velocity dispersion than the metal-rich GCs, and we find little or no rotation in the metal-rich GCs. The velocity dispersion profile is consistent with isotropic GC orbits and the mass distribution inferred from X-ray data. Our sample of GCs spans a metallicity range of −1.6 ≤ [Fe/H] ≤ 0 dex. The metal-poor and metal-rich GCs are coeval within the errors, and all GCs older than 6 Gyr at 95% confidence.

Type
Part XII: Poster Papers
Information
Symposium - International Astronomical Union , Volume 201: New Cosmological Data and the Values of the Fundamental Parameters , 2005 , pp. 441 - 442
Copyright
Copyright © Astronomical Society of the Pacific 2005 

References

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