Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21537104n&link_type=abstract
American Astronomical Society, AAS Meeting #215, #371.04; Bulletin of the American Astronomical Society, Vol. 42, p.580
Astronomy and Astrophysics
Astronomy
Scientific paper
The microquasar GRS 1915+105 is well known for its superluminal ejections and bizarre X-ray variability: its X-ray lightcurve exhibits at least 14 distinct types of variability, many of which show evidence of accretion-ejection limit cycles. We have used eleven Chandra HETGS observations of GRS 1915+105 to study the details of this disk-jet connection. We report the presence of a broad iron emission line in fainter, spectrally hard states and narrow, blueshifted absorption lines in spectrally softer states. We argue that the broad line can be associated with the illumination of the inner accretion disk by the jet, while the absorption lines originate in an accretion disk wind. Our results, cast in terms of the relative importance of hard X-rays (i.e. the power law component), reveal direct competition between the disk wind and the radio jet that is mediated by Comptonization and photoionization. It appears that this stellar-mass black hole can effectively regulate its accretion rate via feedback into its environment, just like its supermassive counterparts.
Lee Jae-Chul
Neilsen Joseph
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