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Intermediate-mass black holes in globular clusters: observations and simulations - Update

Published online by Cambridge University Press:  31 March 2017

Nora Lützgendorf ,
Markus Kissler-Patig ,
Karl Gebhardt ,
Holger Baumgardt ,
Diederik Kruijssen ,
Eva Noyola ,
Nadine Neumayer ,
Tim de Zeeuw ,
Anja Feldmeier-Krause  and
Edwin van der Helm
...Show all authors
Nora Lützgendorf
Affiliation:
ESA, Space Science Department, Keplerlaan 1, NL-2200 AG Noordwijk, The Netherlands email: nluetzge@cosmos.esa.int
Markus Kissler-Patig
Affiliation:
Gemini Observatory, Northern Operations Center, 670 N. A’ohoku Place, Hilo, Hawaii, 96720, USA
Karl Gebhardt
Affiliation:
Department of Astronomy, University of Texas at Austin, Austin, TX 78712, USA
Holger Baumgardt
Affiliation:
School of Mathematics and Physics, University of Queensland, Brisbane, QLD 4072, Australia
Diederik Kruijssen
Affiliation:
Max-Planck Institut für Astrophysik, Karl-Schwarzschild-Straße 1, D-85748, Garching, Germany
Eva Noyola
Affiliation:
Department of Astronomy, University of Texas at Austin, Austin, TX 78712, USA
Nadine Neumayer
Affiliation:
Max-Planck-Institute for Astronomy, Königstuhl 17, 69117, Heidelberg, Germany
Tim de Zeeuw
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Straße 2, D-85748 Garching, Germany Leiden Observatory, Leiden University, PO Box 9513, NL-2300 RA, Leiden, The Netherlands
Anja Feldmeier-Krause
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Straße 2, D-85748 Garching, Germany
Edwin van der Helm
Affiliation:
Leiden Observatory, Leiden University, PO Box 9513, NL-2300 RA, Leiden, The Netherlands
Inti Pelupessy
Affiliation:
Leiden Observatory, Leiden University, PO Box 9513, NL-2300 RA, Leiden, The Netherlands
Simon Portegies Zwart
Affiliation:
Leiden Observatory, Leiden University, PO Box 9513, NL-2300 RA, Leiden, The Netherlands
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Abstract

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The study of intermediate-mass black holes (IMBHs) is a young and promising field of research. If IMBH exist, they could explain the rapid growth of supermassive black holes by acting as seeds in the early stage of galaxy formation. Formed by runaway collisions of massive stars in young and dense stellar clusters, intermediate-mass black holes could still be present in the centers of globular clusters, today. We measured the inner kinematic profiles with integral-field spectroscopy for 10 Galactic globular cluster and determined masses or upper limits of central black holes. In combination with literature data we further studied the positions of our results on known black-hole scaling relations (such as M• − σ) and found a similar but flatter correlation for IMBHs. Applying cluster evolution codes, the change in the slope could be explained with the stellar mass loss occurring in clusters in a tidal field over its life time. Furthermore, we present results from several numerical simulations on the topic of IMBHs and integral field units (IFUs). N-body simulations were used to simulate IFU data cubes. For the specific case of NGC 6388 we simulated two different IFU techniques and found that velocity dispersion measurements from individual velocities are strongly biased towards lower values due to blends of neighbouring stars and background light. In addition, we use the Astrophysical Multipurpose Software Environment (AMUSE) to combine gravitational physics, stellar evolution and hydrodynamics to simulate the accretion of stellar winds onto a black hole. We find that the S-stars need to provide very strong winds in order to explain the accretion rate in the galactic center.

Keywords

stars: kinematics and dynamicsmethods: numericalblack hole physics
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S316: Formation, evolution, and survival of massive star clusters , August 2015 , pp. 240 - 245
Copyright
Copyright © International Astronomical Union 2017 

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