Excess sub-millimetre emission from GRS 1915+105

Details Excess sub-millimetre emission from GRS 1915+105 Excess sub-millimetre emission from GRS 1915+105

2000-04-10

arxiv.org/abs/astro-ph/0004123v1

Mon.Not.Roy.Astron.Soc. 317 (2000) 158

Astronomy and Astrophysics

Astrophysics

5 pages, 3 figures, accepted for publication in MNRAS

Scientific paper

10.1046/j.1365-8711.2000.03609.x

We present the first detections of the black hole X-ray binary GRS 1915+105 at sub-millimetre wavelengths. We clearly detect the source at 350 GHz on two epochs, with significant variability over the 24 hr between epochs. Quasi-simultaneous radio monitoring indicates an approximately flat spectrum from 2 - 350 GHz, although there is marginal evidence for a minimum in the spectrum between 15 - 350 GHz. The flat spectrum and correlated variability imply that the sub-mm emission arises from the same synchrotron source as the radio emission. This source is likely to be a quasi-steady partially self-absorbed jet, in which case these sub-mm observations probe significantly closer to the base of the jet than do radio observations and may be used in future as a valuable diagnostic of the disc:jet connection in this source.

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