Globular Clusters as Probes of the Virgo gE NGC 4472

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dc.creatorBridges, Terry
dc.creatorAshman, Keith
dc.creatorBeasley, Mike
dc.creatorSharples, Ray
dc.creatorGeisler, Doug
dc.creatorHanes, Dave
dc.creatorZepf, Steve
dc.date2000-11-23
dc.date.accessioned2026-07-07T01:56:39Z
dc.date.available2026-07-07T01:56:39Z
dc.descriptionWe present radial velocities for 144 globular clusters around the Virgo gE NGC 4472 (M49), and ages and metallicities from co-added spectra of 131 clusters. We confirm our earlier finding that the metal-poor clusters have a significantly higher velocity dispersion than the metal-rich clusters, and we find little or no rotation in the metal-rich clusters. The velocity dispersion profile is consistent with isotropic orbits for the clusters and the NGC 4472 mass distribution inferred from X-ray data. Our sample of clusters spans a metallicity range of -1.6 < [Fe/H] < 0 dex. The metal-poor and metal-rich cluster populations are coeval within the errors, and all clusters are older than 6 Gyr at 95% confidence. Our findings are consistent with a merger origin for NGC 4472, but other elliptical formation models cannot be ruled out.
dc.description3 pages, 3 figures. Slightly expanded version of paper to appear in IAU Symposium 201, New Cosmological Data and the Values of the Fundamental Parameters, August 2000 (eds. A. Lasenby and A. Wilkinson)
dc.identifierhttps://arxiv.org/abs/astro-ph/0011423
dc.identifierhttp://arxiv.org/abs/astro-ph/0011423
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/2077
dc.subjectAstrophysics
dc.titleGlobular Clusters as Probes of the Virgo gE NGC 4472
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