Probing the Accretion Geometry of a Quiescent Black Hole

Details Probing the Accretion Geometry of a Quiescent Black Hole Probing the Accretion Geometry of a Quiescent Black Hole

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9686h&link_type=abstract

HST Proposal ID #9686

Physics

Hst Proposal Id #9686

Scientific paper

Advective accretion is invoked to explain low luminosity accretion onto both stellar mass and supermassive black holes. There has been much theoritcal activity, and controversy, but observational constraints are weak. We have found considerable x-ray and optical variability. The similarity of timescales and amplitudes, and the emission line kinematics all suggest that the optical variability is driven by x-ray illumination of the accretion disc. We now propose the first simultaneous x-ray and optical observations to test if the variations are correlated and measure relative amplitudes. Our program will yield new constraints upon the models, as the strength of the optical emission line response is sensitive to the unobservable EUV spectrum, and to the x-ray emission geometry.

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