The radio spectrum of a quiescent stellar mass black hole

Details The radio spectrum of a quiescent stellar mass black hole The radio spectrum of a quiescent stellar mass black hole

2004-10-15

arxiv.org/abs/astro-ph/0410387v1

Mon.Not.Roy.Astron.Soc. 356 (2005) 1017

Astronomy and Astrophysics

Astrophysics

accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2004.08503.x

Observations of V404 Cyg performed with the Westerbork Synthesis Radio Telescope at four frequencies, over the interval 1.4-8.4 GHz, have provided us with the first broadband radio spectrum of a `quiescent' stellar mass black hole. The measured mean flux density is of 0.35 mJy, with a spectral index alpha=+ 0.09\pm0.19$ (such that S_nu \propto nu^{alpha}). Synchrotron emission from an inhomogeneous partially self-absorbed outflow of plasma accounts for the flat/inverted radio spectrum, in analogy with hard state black hole X-ray binaries, indicating that a steady jet is being produced between a few 10^{-6} and a few per cent of the Eddington X-ray luminosity.

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