Toward Unification of Hysteresis Effects in State Transitions of Binary Black Holes

Details Toward Unification of Hysteresis Effects in State Transitions of Binary Black Holes Toward Unification of Hysteresis Effects in State Transitions of Binary Black Holes

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.1104s&link_type=abstract

American Astronomical Society, HEAD meeting #11, #11.04; Bulletin of the American Astronomical Society, Vol. 41, p.671

Astronomy and Astrophysics

Astrophysics

Scientific paper

Transient black hole x-ray binaries in outburst generally show a hysteresis effect: they start in a hard, power-law-dominated spectral state, transition to a soft state with a strong thermal disk component near maximum brightness (which we may call the "bright transition"), and decay in the soft state, going back to the hard state at low luminosity (the "faint transition"). Two persistent Galactic binaries, GRS 1758-258 and 1E 1740.7-2942, show behavior like the bright transition -- they transition to the soft state when they are ready to fade -- except that the rising/hard phase can last for years, making them appear as persistent hard sources that occasionally undergo episodes of dimming and softening. Another persistent source, LMC X-3, is almost always in the soft spectral state, but makes an occasional faint transition to the hard state. All three persistent sources show repeated partial transitions, with moderate spectral changes; these partial transitions are also seen within outbursts of transients like GX 339-4. We will attempt to empirically categorize these full and partial transitions in a unified framework and survey some of the recent theoretical literature for ingredients that may help explain the entire picture. This work is supported by the NASA Astrophysics Data Analysis program through grant NNX09AC86G.

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