Intermediate-mass black holes in globular clusters

17 Apr

[2013MmSAI..84..129L] Lützgendorf, N.; Kissler-Patig, M.; Gebhardt, K.; Baumgardt, H.; Noyola, E.; de Zeeuw, P. T.; Neumayer, N.; Jalali, B.; Feldmeier, A.

Screen Shot 2015-04-17 at 10.11.42For a sample of nine Galactic globular clusters we measured the inner kinematic profiles with integral-field spectroscopy that we combined with existing outer kinematic measurements and HST luminosity profiles. With this information we are able to detect the crucial rise in the velocity-dispersion profile which indicates the presence of a central black hole. In addition, N-body simulations compared to our data will give us a deeper insight in the properties of clusters with black holes and stronger selection criteria for further studies. For the first time, we obtain a homogeneous sample of globular cluster integral-field spectroscopy which allows a direct comparison between clusters with and without an intermediate-mass black hole.