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GRS1915+105: a comparison of the plateau state to the canonical hard state

Published online by Cambridge University Press:  24 February 2011

Pieter van Oers  and
Sera Markoff
Pieter van Oers
Affiliation:
School of Physics & Astronomy, University of Southampton, Highfield, Southampton SO17 1BJ, United Kingdom email: [email protected]
Sera Markoff
Affiliation:
Astronomical institute “Anton Pannekoek”, University of Amsterdam, Science Park 904, 1098 XH, The Netherlands email: [email protected]
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Abstract

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GRS 1915+105 is a very peculiar black hole binary that exhibits accretion-related states that are not observed in any other stellar-mass black hole system. One of these states, however – referred to as the plateau state – may be related to the canonical hard state of black hole X-ray binaries. Both the plateau and hard state are associated with steady, relatively lower X-ray emission and flat/inverted radio emission, that is sometimes resolved into compact, self-absorbed jets. To investigate the relationship between the plateau and the hard state, we fit two multi-wavelength observations using a steady-state outflow-dominated model, developed for hard state black hole binaries. The data sets consist of quasi-simultaneous observations in radio, near-infrared and X-ray bands. Interestingly, we find both significant differences between the two plateau states, as well as between the best-fit model parameters and those representative of the hard state. We discuss our interpretation of these results, and the possible implications for GRS 1915+105's relationship to canonical black hole candidates.

Keywords

black hole physicsaccretionaccretion disksradiation mechanisms: generalX-rays: binariesgalaxies: activegalaxies: jets
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S275: Jets at all Scales , September 2010 , pp. 294 - 298
Copyright
Copyright © International Astronomical Union 2011

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