Hard (State) Problems

Details Hard (State) Problems Hard (State) Problems

2008-12-16

arxiv.org/abs/0812.2980v1

PoS MQW7:004,2008

Astronomy and Astrophysics

Astrophysics

12 pages, 2 figures, invited talk at the VII Microquasar Workshop, 2008 September 1-5, Foca, Turkey

Scientific paper

For microquasars, the one time when these systems exhibit steady and powerful jets is when they are in the hard state. Thus, our understanding of this state is key to learning about the disk/jet connection. Recent observational and theoretical results have led to questions about whether we really understand the physical properties of this state, and even our basic picture of this state is uncertain. Here, I discuss some of the recent developments and possible problems with our understanding of this state. Overall, it appears that the strongest challenge to the standard truncated disk picture is the detection of broad iron features in the X-ray spectra, and it seems that either there is a problem with the truncated disk picture or there is a problem with the relativistic reflection models used to explain the broad iron features.

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