Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.4222w&link_type=abstract
American Astronomical Society, HEAD meeting #11, #42.22; Bulletin of the American Astronomical Society, Vol. 41, p.728
Astronomy and Astrophysics
Astronomy
Scientific paper
Studies of relativistically broadened iron lines in black hole X-ray binaries (BHXRBs) can provide constraints on the truncation radius of the accretion disk. A common model of the hard state of BHXRBs suggests that the disc becomes more truncated as the source becomes harder. At the same time, frequencies of the Lorentzian features in the Fourier power-spectrum decrease, suggesting that these frequencies are linked to characteristic time-scales in the inner disc. To test this interpretation of hard state behaviour and our understanding of broad iron lines, we recently obtained an XMM-Newton TOO observation of the BHXRB GX 339-4 in its hard state, at a time when the low-frequency Lorentzian timing signature is 5 times lower than observed in a hard state observation of the source obtained in 2004. We present a comparison of these spectra here, focussing on the iron line.
Boeck Moritz
Cassatella Pablo
Diaz Trigo Maria
Hanke Manfred
Pottschmidt Katja
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