A ROBUST DETERMINATION OF THE SIZE OF QUASAR ACCRETION DISKS USING GRAVITATIONAL MICROLENSING

作者：Jimenez Vicente J^*; Mediavilla E; Munoz J A; Kochanek C S

来源：Astrophysical Journal, 2012, 751(2): 106.

DOI：10.1088/0004-637X/751/2/106

• accretion, accretion disks
• gravitational lensing: micro
• quasars: general

Using microlensing measurements for a sample of 27 image pairs of 19 lensed quasars we determine a maximum likelihood estimate for the accretion disk size of an average quasar of r(s) = 4.0(-3.1)(+2.4) lt-day at rest frame %26lt;lambda %26gt; = 1736 angstrom for microlenses with a mean mass of %26lt; M %26gt; = 0.3 M-circle dot. This value, in good agreement with previous results from smaller samples, is roughly a factor of five greater than the predictions of the standard thin disk model. The individual size estimates for the 19 quasars in our sample are also in excellent agreement with the results of the joint maximum likelihood analysis.

• 出版日期2012-6-1