The Physics Of Disk Winds, Jets, And Fast X-ray Variability In The Microquasar GRS 1915+105

Details The Physics Of Disk Winds, Jets, And Fast X-ray Variability In The Microquasar GRS 1915+105 The Physics Of Disk Winds, Jets, And Fast X-ray Variability In The Microquasar GRS 1915+105

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21740401n&link_type=abstract

American Astronomical Society, AAS Meeting #217, #404.01; Bulletin of the American Astronomical Society, Vol. 43, 2011

Physics

Scientific paper

I present new insights about accretion and ejection physics based on two high-resolution X-ray studies of strong variability in the microquasar GRS 1915+105. First, we use 10 years of Chandra HETGS observations to probe the long-term connection between the accretion disk wind and the radio jet. We find that the strength of the wind and the jet are anticorrelated, and that the wind carries enough matter away from the black hole to suppress the jet. Thus mass ejection is regulated in GRS 1915+105. Second, we perform the very first fast phase-resolved spectroscopy of a variability class in GRS 1915+105. For the first time, we are able to show that changes in the broadband X-ray spectrum (RXTE) on timescales of seconds are associated with measurable changes in absorption lines (Chandra HETGS) from the accretion disk wind. Our X-ray data thus reveal the black hole as it ejects a portion of the inner accretion flow and then drives a wind from the outer disk in a bizarre cycle that last fewer than 60 seconds but repeats for days. Our results indicate that the accretion disk wind may play an integral role in GRS 1915+105, not only in quenching the jet on long and possibly short timescales, but also in producing or facilitating transitions between classes of X-ray variability.

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