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Excess submillimetre emission from GRS 1915+105 |
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| Authors: | R N Ogley S J Bell Burnell R P Fender G G Pooley E B Waltman |
| Institution: | Service d'Astrophysique, C. E. A. Saclay, Orme des Merisiers –Bât 709, F-91191 Gif-sur-Yvette Cedex, France;Department of Physics, The Open University, Milton Keynes MK7 6AA;Princeton University, Physics Department, Jadwin Hall, PO Box 708, Princeton, NJ 08544-0708, USA;Astronomical Institute 'Anton Pannekoek' and Center for High-Energy Astrophysics, University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, the Netherlands;MRAO, Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE;Remote Sensing Division, Naval Research Laboratory, Code 7210, Washington, DC 20375-5351, USA |
| Abstract: | We present the first detections of the black hole X-ray binary GRS 1915+105 at submillimetre (submm) wavelengths. We clearly detect the source at 350 GHz in two epochs, with significant variability over the 24 h between epochs. Quasi-simultaneous radio monitoring indicates an approximately flat spectrum from 2 to 350 GHz, although there is marginal evidence for a minimum in the spectrum between 15 and 350 GHz. The flat spectrum and correlated variability imply that the submm 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 submm 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. |
| Keywords: | binaries: close stars: individual: GRS 1915+105 stars: variables: other radio continuum: stars X-rays: stars |