Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-09-15
Astronomy and Astrophysics
Astrophysics
To appear in Astron. Nachr. in the proceedings of the XMM-Newton workshop "Variable and Broad Iron Lines Around Black Holes",
Scientific paper
10.1002/asna.200610680
In this contribution, I briefly review recent progress in detecting and measuring the properties of relativistic iron lines observed in stellar-mass black hole systems, and the aspects of these lines that are most relevant to studies of similar lines in Seyfert-1 AGN. In particular, the lines observed in stellar-mass black holes are not complicated by complex low-energy absorption or partial-covering of the central engine, and strong lines are largely independent of the model used to fit the underlying broad-band continuum flux. Indeed, relativistic iron lines are the most robust diagnostic of black hole spin that is presently available to observers, with specific advantages over the systematics-plagued disk continuum. If accretion onto stellar-mass black holes simply scales with mass, then the widespread nature of lines in stellar-mass black holes may indicate that lines should be common in Seyfert-1 AGN, though perhaps harder to detect.
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