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Observational Evidence for Black Holes in Globular Clusters Karl Gebhardt (UT Austin)

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Presentation on theme: "Observational Evidence for Black Holes in Globular Clusters Karl Gebhardt (UT Austin)"— Presentation transcript:

1 Observational Evidence for Black Holes in Globular Clusters Karl Gebhardt (UT Austin)

2 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

3 Current BH/sigma correlation using published results

4 Comparing M15 radial velocities with proper motions (McNamara et al), using distance as measured from Kraft and Ivans 2003 (11.2 kpc )

5 Comparison with Baumgardt et al dispersion profile, including a BH of 1700 Msun.

6 Models with adding a BH to Baumgardt profile for the 100% and 0% ns population

7 G1 with WFPCG1 with HRC

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12 NGC6752 Pulsar Strangeness

13 Rotation in Galactic clusters

14 Central Rotation in Galactic clusters

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20 Central Surface Brightness Profiles

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22 BH/sigma correlation using isotropic models

23 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


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