Radio Emission from the Intermediate-Mass Black Hole GH 10

Details Radio Emission from the Intermediate-Mass Black Hole GH 10 Radio Emission from the Intermediate-Mass Black Hole GH 10

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.4408w&link_type=abstract

American Astronomical Society, AAS Meeting #211, #44.08; Bulletin of the American Astronomical Society, Vol. 39, p.793

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a single-epoch radio spectrum of GH 10, a broad-lined active galactic nucleus energized by a black hole of mass 800,000 Solar masses. The radio emission from this so-called intermediate-mass black hole has a falling spectrum, with slope -0.85+/-0.06, as measured at 1.4, 4.9 and 8.5 GHz with the NRAO Very Large Array on 2007 Jun 18. This emission is compact, with a 4.9-GHz diameter of less than 0.21 arcsec, corresponding to 320 pc at GH 10's distance of 360 Mpc. These radio properties imply synchrotron emission, which could be driven by the black hole and/or by circumnuclear star formation. The latter process cannot dominate because the required star-formation rate, about 10 Solar masses per year, is inconsistent with the host galaxy's optical traits. If the black hole drives some of the radio emission, then imaging with a resolution of tens of parsecs will reveal the physical connection between the black hole and the synchrotron plasma. GH 10 is radiating close to its Eddington limit and may be a local analog of the starting conditions, or seeds, for supermassive black holes. The NRAO is a facility of the NSF operated under cooperative agreement by AUI.

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