Black Hole Accretion Outbursts in Soft x- Ray Transients

Details Black Hole Accretion Outbursts in Soft x- Ray Transients Black Hole Accretion Outbursts in Soft x- Ray Transients

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8245h&link_type=abstract

HST Proposal ID #8245

Physics

Hst Proposal Id #8245 Binary Stars

Scientific paper

UV observations of soft X-ray transients {SXTs} will be made using STIS. This is part of an extensive multiwavelength target of opportunity campaign to monitor newly discovered SXTs in outburst and throughout the subsequent decline. Recent work establishes that a high proportion of SXTs harbor black holes, so these observations provide an unrivalled opportunity to obtain high quality data from an accreting black hole. UV data is a keystone of our multiwavelength campaign because the disk regions of interest radiate predominantly in the UV. Emission lines will allow us to probe the kinematics of the inner disk region. We will examine the relative strengths of the reprocessed X-ray flux emitted in the UV, and the UV flux generated by viscous heating in the accretion flow. Multiwavelength observations will probe the physics of the accretion flow throughout the outburst. The observations will yield detailed quantitative tests of the models for SXT outbursts. The new STIS/MAMA capability to perform UV spectroscopy with 125 microsecond time resolution will be exploited. A proven HST/RXTE echo-mapping experiment will measure the size of the reprocessing regions in the accretion disk, and thus probe morphology changes as the decline proceeds. It is unknown what rapid UV variability we may find; recent RXTE discoveries suggest this may prove a rich source of information on the dynamics close to the event horizon.

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