Journal Article

Radio observations of NGC 6388: an upper limit on the mass of its central black hole

D. Cseh, P. Kaaret, S. Corbel, E. Körding, M. Coriat, A. Tzioumis and B. Lanzoni

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 406, issue 2, pages 1049-1054
Published in print August 2010 | ISSN: 0035-8711
Published online July 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.16726.x
Radio observations of NGC 6388: an upper limit on the mass of its central black hole

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We present the results of deep radio observations with the Australia Telescope Compact Array (ATCA) of the globular cluster NGC 6388. We show that there is no radio source detected (with an rms noise level of 27 μJy) at the cluster centre of gravity or at the locations of any of the Chandra X-ray sources in the cluster. Based on the fundamental plane of accreting black holes which is a relationship between X-ray luminosity, radio luminosity and black hole mass, we place an upper limit of ∼1500 M on the mass of the putative intermediate-mass black hole located at the centre of NGC 6388. We discuss the uncertainties of this upper limit and the previously suggested black hole mass of based on surface density profile analysis.

Keywords: accretion, accretion disks; black hole physics; globular clusters: general; globular clusters: individual: NGC 6388; radio continuum: general

Journal Article.  4533 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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