Microlensing and the structure of active galactic nucleus accretion disks

Details Microlensing and the structure of active galactic nucleus accretion disks Microlensing and the structure of active galactic nucleus accretion disks

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...381l..39r&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 381, Nov. 10, 1991, p. L39-L42.

Astronomy and Astrophysics

Astrophysics

102

Accretion Disks, Active Galactic Nuclei, Gravitational Lenses, Quasars, Astronomical Models, Brightness Temperature, Electron Scattering, Galactic Structure

Scientific paper

Rapid variability has been reported in two of the four gravitationally lensed images of Q2237 + 0305, and this is attributed to microlensing caused by the intervening stars. The associated constraints on the source size and properties are studied and compared with a variety of stationary accretion disk models. The reported microlensing variation in Q2237 + 0305 requires the disk size to be over 3 times smaller than a blackbody disk of similar luminosity, implying that the optical emission is either nonthermal or optically tin. An exploration of nonstationary disk models including orbiting, transient hot spots leads to a similar conclusion. Implications for models of active galactic nucleus optical continua are briefly discussed.

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