Mon. Not. R. Astron. Soc., 409, 763-776 (2010/December-1)
Is the plateau state in GRS 1915+105 equivalent to canonical hard states ?
VAN OERS P., MARKOFF S., RAHOUI F., MAITRA D., NOWAK M., WILMS J., CASTRO-TIRADO A.J., RODRIGUEZ J., DHAWAN V. and HARLAFTIS E.
Abstract (from CDS):
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. However, while generally black hole binaries quench their jets when the luminosity becomes too high, GRS 1915+105 seems to sustain them despite the fact that it accretes at near- or super-Eddington rates. In order to investigate the relationship between the plateau and the hard state, we fit two multiwavelength 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-fitting 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.
© 2010 The Authors. Journal compilation © 2010 RAS
accretion, accretion discs - black hole physics - radiation mechanisms: general - galaxies: active - galaxies: jets - X-rays: binaries
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