observational evidence for black holes in globular clusters karl gebhardt (ut austin)
Post on 21-Dec-2015
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![Page 1: Observational Evidence for Black Holes in Globular Clusters Karl Gebhardt (UT Austin)](https://reader035.vdocument.in/reader035/viewer/2022062421/56649d575503460f94a357f7/html5/thumbnails/1.jpg)
Observational Evidence for Black Holes in Globular Clusters
Karl Gebhardt (UT Austin)
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Results to Date from Dynamical Studies
• M15 has been painful for many years
Gerssen et al. 2003 claim a 2000 Msun BH from radial vels
Baumgardt et al. 2003 say no evidence
McNamara et al. 2003 say no evidence from proper motions
• G1
Gebhardt, Rich, & Ho claim 2e4 Msun BH
Baumgardt et al. 2003 say no evidence
New data being analyzed
• NGC 6752
Drukkier et al. 2003 claim large M/L increase from pm’s
Xie et al. 2003 claim little M/L increase from radial vels
Colpi et al. 2003 use pulsars to argue for something massive
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Current BH/sigma correlation using published results
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Comparing M15 radial velocities with proper motions (McNamara et al), using distance as
measured from Kraft and Ivans 2003 (11.2 kpc)
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Comparison with Baumgardt et al dispersion profile, including a BH of 1700 Msun.
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Models with adding a BH to Baumgardt profilefor the 100% and 0% ns population
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G1 with WFPC G1 with HRC
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NGC6752 Pulsar Strangeness
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Rotation in Galactic clusters
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Central Rotation in Galactic clusters
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Central Surface Brightness Profiles
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BH/sigma correlation using isotropic models
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Conclusions
• M15 and G1 still have black holes as the best fitting model
• central light profiles for clusters show a range of slopes
• rotation in clusters is important to consider
• many clusters show a statistically significant increase in the central rotation, which has a PA that is not correlated with that of the main body rotation