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

Abstract

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 a r.m.s. noise level of 27 uJy) at the cluster centre of gravity or at the locations of the 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_sun 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 5700 M_sun based on surface density profile analysis.

6 pages, 2 figures, accepted for publication in MNRAS

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• The MAVERIC Survey: Still No Evidence for Accreting Intermediate-mass Black Holes in Globular Clusters
• The absence of radio emission from the globular cluster G1
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• Widespread presence of shallow cusps in the surface-brightness profile of globular clusters
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• X-ray Binaries in the Ultrahigh Encounter Rate Globular Cluster NGC 6388
• The Candidate Intermediate-Mass Black Hole in the Globular Cluster M54
• The mass budget for intermediate-mass black holes in dense star clusters
• A Stacked Search for Intermediate-Mass Black Holes in 337 Extragalactic Star Clusters
• Ultra-deep ATCA imaging of 47 Tucanae reveals a central compact radio source
• Do Intermediate-Mass Black Holes Exist in Globular Clusters?
• A Chandra Survey of Milky Way Globular Clusters. III. Searching for X-ray Signature of Intermediate-mass Black Holes
• Synthetic extinction maps around intermediate-mass black holes in Galactic globular clusters
• The contribution of supermassive black holes in stripped nuclei to the supermassive black hole population of UCDs and galaxy clusters