Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001chfe.sympe...1a&link_type=abstract
Chandra Fellows Symposium 2001, held 15 October, 2001 at Harvard-Smithsonian Center for Astrophysics, meeting abstract.
Astronomy and Astrophysics
Astrophysics
Scientific paper
Accretion disk models for quasars require strong magnetic fields for transport of angular momentum, allowing gas to accrete and creating magnetic activity which may result in X-ray emission. One consequence of near-equipartition fields is that thermal emission from the accretion disk should be unpolarized due to strong Faraday depolarization in the accretion disk atmosphere. We discuss a means to measure the intrinsic disk polarization using microlensing of a quasar to remove contamination of polarized light created exterior to the disk. X-ray emission near a disk can produce fluorescence from the disk, which if microlensed by a caustic, creates a distinctive signature. We describe predictions for the microlensing of a relativistic disk emission line by a caustic, and discuss recent Chandra observations of the lens MG 0414+0534 which show evidence for microlensing of a narrow iron line, which might be the outer edges of a relativistically broadened line.
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