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GRS1915+105 is a very peculiar black hole binary (BHB), as it presents us with some states never before seen in other black hole systems. However one of these states, referred to as the plateau or χ state, may be related to the canonical hard state because of its association with steady, relatively lower X-ray emission and flat/inverted radio emission. Compact, self-absorbed jets have also been observed in this state. In order to investigate the relationship between the plateau and the hard state, we fit two multi-wavelength observations using a steady-state outflowdominated model, developed for hard state BHBs. The data sets consist of quasi-simultaneous observations in radio, IR and X-ray. 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 GRS1915+105’s relationship to canonical black hole candidates.

How does the GRS1915+105 plateau state compare to the canonical hard state?