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Is the plateau state in GRS 1915+105 equivalent to canonical hard states?

Abstract : 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.
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Submitted on : Thursday, March 31, 2022 - 7:48:24 AM
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Pieter van Oers, Sera Markoff, Farid Rahoui, Dipankar Maitra, Michael Nowak, et al.. Is the plateau state in GRS 1915+105 equivalent to canonical hard states?. Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2010, 409, pp.763-776. ⟨10.1111/j.1365-2966.2010.17339.x⟩. ⟨insu-03625619⟩

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