The Low/soft State in the Microquasar 1E1740.7-2942

Details The Low/soft State in the Microquasar 1E1740.7-2942 The Low/soft State in the Microquasar 1E1740.7-2942

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001cxo..prop.1110h&link_type=abstract

Chandra Proposal ID #03408104

Physics

Chandra Proposal Id #03408104

Scientific paper

Based on RXTE monitoring, the microquasar 1E1740.7-2942 has faded and softened dramatically, entering a "low/soft" state seen only in its twin microquasar, GRS1758-258. It is unlikely that this state will occur again for a decade. The usual black hole "high/soft" state appears at high luminosity, but this low/soft state appears while the source is dim/fading. We speculate that this is caused by the shutoff of accretion to two simultaneous flows: a thin disk and a hot, radial coronal flow. The transition occurs because the hot flow accretes away rapidly (free-fall timescale) while the disk is consumed on the viscous timescale (weeks). GRS1758-258 showed an exponential flux decay with a timescale of about a month after the transition. We expect similar behavior in 1E1740.7-2942. Chandra will confirm the presence of a simple disk spectrum seen now without a corona. If the corona has been ejected, it may detect jets via extended morphology or Doppler shifted emission lines.

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