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We present results of deep radio continuum observations of two galacticglobular clusters 47 Tucanae (47 Tuc) and Omega Centauri (Omega Cen) withAustralia Telescope Compact Array (ATCA). No statistically significant evidencefor radio emission was found from the central region for the two clusters.However, both clusters show a 2.5-sigma detection near the center that may beconfirmed by future deeper radio observations. The 3-sigma upper limits of theradio observations is 20 and 40 microJy/beam for Omega Cen and 47 Tuc,respectively. By using the fundamental plane of accreting black holes whichdescribes the relationship between radio luminosity, X-ray luminosity and blackhole mass, we constrain the mass of a possible intermediate-mass black hole(IMBH) in the globualar clusters. We also compare our results with otherglobular clusters and discuss the existence of IMBHs in globular clusters.

Radio Continuum Observations of 47 Tucanae and Omega Centauri: Hints for Intermediate-mass Black Holes?