Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2012-02-27
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
Accepted for publication in ApJ. 8 pages, 6 figures. Uses emulateapj. Comments welcome
Scientific paper
During its 2005 outburst, GRO J1655-40 was observed twice with the Chandra High Energy Transmission Grating Spectrometer; the second observation revealed a spectrum rich with ionized absorption lines from elements ranging from O to Ni (Miller et al. 2006a, 2008; Kallman et al. 2009), indicative of an outflow too dense and too ionized to be driven by radiation or thermal pressure. To date, this spectrum is the only definitive evidence of an ionized wind driven off the accretion disk by magnetic processes in a black hole X-ray binary. Here we present our detailed spectral analysis of the first Chandra observation, nearly three weeks earlier, in which the only signature of the wind is the Fe XXVI absorption line. Comparing the broadband X-ray spectra via photoionization models, we argue that the differences in the Chandra spectra cannot possibly be explained by the changes in the ionizing spectrum, which implies that the properties of the wind cannot be constant throughout the outburst. We explore physical scenarios for the changes in the wind, which we suggest may begin as a hybrid MHD/thermal wind, but evolves over the course of weeks into two distinct outflows with different properties. We discuss the implications of our results for the links between the state of the accretion flow and the presence of transient disk winds.
Homan Jeroen
Neilsen Joseph
No associations
LandOfFree
A Hybrid Magnetically/Thermally-Driven Wind in the Black Hole GRO J1655-40? does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A Hybrid Magnetically/Thermally-Driven Wind in the Black Hole GRO J1655-40?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A Hybrid Magnetically/Thermally-Driven Wind in the Black Hole GRO J1655-40? will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-605072