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Searching for IMBHs in Galactic globular clusters through radial velocities of individual stars

Published online by Cambridge University Press:  07 March 2016

Barbara Lanzoni
Barbara Lanzoni*
Affiliation:
Department of Physics and Astronomy, University of Bologna, Viale Berti Pichat 6/2, 40127 Bologna, Italy email: [email protected]
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Abstract

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I present an overview of our ongoing project aimed at building a new generation of velocity dispersion profiles ad rotation curves for a representative sample of Galactic globular clusters, from the the radial velocity of hundreds of individual stars distributed at different distances from the cluster center. The innermost portion of the profiles will be used to constrain the possible presence of intermediate-mass black holes. The adopted methodology consists of combining spectroscopic observations acquired with three different instruments at the ESO-VLT: the adaptive-optics assisted, integral field unit (IFU) spectrograph SINFONI for the innermost and highly crowded cluster cores, the multi-IFU spectrograph KMOS for the intermediate regions, and the multi-fiber instrument FLAMES/GIRAFFE-MEDUSA for the outskirts. The case of NGC 6388, representing the pilot project that motivated the entire program, is described in some details.

Keywords

globular clusters: generalglobular clusters: individual (NGC 6388)stars: kinematicstechniques: spectroscopicinstrumentation: adaptive opticsblack hole physics
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Issue S312: Star Clusters and Black Holes in Galaxies across Cosmic Time , August 2014 , pp. 189 - 196
Copyright
Copyright © International Astronomical Union 2016 

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