Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.2703a&link_type=abstract
American Astronomical Society, 193rd AAS Meeting, #27.03; Bulletin of the American Astronomical Society, Vol. 30, p.1286
Astronomy and Astrophysics
Astronomy
Scientific paper
The Einstein Cross is a gravitationally lensed quasar which undergoes variations due to microlensing by stars in the lens galaxy. Microlensing constrains the size of the optical emission region to be less than 2x10(15) cm. Future IR/optical/UV monitoring will allow us to map out the surface brightness of the quasar by inversion of the lightcurve during a high amplification microlensing event. If the quasar is powered by geometrically thin, azimuthally symmetric accretion onto a black hole, then the lightcurve can also be inverted to obtain the surface brightness at the accretion disk. We perform the inversion using a regularization constraint, and find that we can reproduce the surface brightness quite well (to 30% near the peak) for accretion disk models which are consistent with the dereddened data, assuming that we have 1% photometry from K band to near UV at 40 points during a clean high amplification event. We can also constrain the inclination angle and size of the black hole (if the caustic velocity is known). We cannot constrain the black hole spin.
Agol Eric
Krolik Julian
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