Toward a Unified View of Black Hole High Energy States

Details Toward a Unified View of Black Hole High Energy States Toward a Unified View of Black Hole High Energy States

1995-09-07

arxiv.org/abs/astro-ph/9509046v1

Publ.Astron.Soc.Pac. 107 (1995) 1207

Astronomy and Astrophysics

Astrophysics

12 pages, self-unpacking uuencoded postscript (figures included), to be published in Pub. of the Astro. Society of the Pacific

Scientific paper

10.1086/133679

We present here a review of high energy (> 1 keV) observations of seven black hole candidates, six of which have estimated masses. In this review we focus on two parameters of interest: the ratio of ``non-thermal" to total luminosity as a function of the total luminosity divided by the Eddington luminosity, and the root mean square (rms) variability as a function of the non-thermal to total luminosity ratio. Below $\sim 10\%$ Eddington luminosity, the sources tend to be strictly non-thermal (the so called ``off" and ``low" states). Above this luminosity the sources become mostly thermal (the ``high" state), with the non-thermal component increasing with luminosity (the ``very high" and ``flare" states). There are important exceptions to this behavior, however, and no steady -- as opposed to transient -- source has been observed over a wide range of parameter space. In addition, the rms variability is positively correlated with the ratio of non-thermal to total luminosity, although there may be a minimum level of variability associated with ``thermal'' states. We discuss these results in light of theoretical models and find that currently no single model describes the full range of black hole high energy behavior. In fact, the observations are exactly opposite from what one expects based upon simple notions of accretion disk instabilities.

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