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An Extreme X-ray Disk Wind in the Black Hole Candidate IGR J17091-3624Chandra spectroscopy of transient stellar-mass black holes in outburst has clearly revealed accretion disk winds in soft, disk-dominated states, in apparent anti-correlation with relativistic jets in low/hard states. These disk winds are observed to be highly ionized. dense. and to have typical velocities of approx 1000 km/s or less projected along our line of sight. Here. we present an analysis of two Chandra High Energy Transmission Grating spectra of the Galactic black hole candidate IGR J17091-3624 and contemporaneous EVLA radio observations. obtained in 2011. The second Chandra observation reveals an absorption line at 6.91+/-0.01 keV; associating this line with He-like Fe XXV requires a blue-shift of 9300(+500/-400) km/ s (0.03c. or the escape velocity at 1000 R(sub schw)). This projected outflow velocity is an order of magnitude higher than has previously been observed in stellar-mass black holes, and is broadly consistent with some of the fastest winds detected in active galactic nuclei. A potential feature at 7.32 keV, if due to Fe XXVI, would imply a velocity of approx 14600 km/s (0.05c), but this putative feature is marginal. Photoionization modeling suggests that the accretion disk wind in IGR J17091-3624 may originate within 43,300 Schwarzschild radii of the black hole, and may be expelling more gas than accretes. The contemporaneous EVLA observations strongly indicate that jet activity was indeed quenched at the time of our Chandra observations. We discuss the results in the context of disk winds, jets, and basic accretion disk physics in accreting black hole systems
Document ID
20120015188
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
King, A. L.
(Michigan Univ. Ann Arbor, MI, United States)
Miller, J. M.
(Michigan Univ. Ann Arbor, MI, United States)
Raymond, J.
(Smithsonian Astrophysical Observatory Cambridge, MA, United States)
Fabian, A. C.
(Cambridge Univ. Cambridge, United Kingdom)
Reynolds, C. S.
(Maryland Univ. College Park, MD, United States)
Kallman, T. R.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Maitra, D.
(Michigan Univ. Ann Arbor, MI, United States)
Cackett, E. M.
(Cambridge Univ. Cambridge, United Kingdom)
Rupen, M. P.
(National Radio Astronomy Observatory Socorro, NM, United States)
Date Acquired
August 26, 2013
Publication Date
January 1, 2012
Subject Category
Astrophysics
Report/Patent Number
GSFC.JA.6983.2012
Distribution Limits
Public
Copyright
Public Use Permitted.
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