6533b821fe1ef96bd127c2f1
RESEARCH PRODUCT
A Robust Determination of the size of quasar accretion disks using gravitational microlensing
Christopher S. KochanekJ. A. MuñozJ. Jiménez-vicenteEvencio MediavillaEvencio Mediavillasubject
PhysicsCosmology and Nongalactic Astrophysics (astro-ph.CO)010308 nuclear & particles physicsMaximum likelihoodFOS: Physical sciencesAstronomy and AstrophysicsQuasarMaximum likelihood analysisAstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsRest frameGravitational microlensing01 natural sciencesAccretion discThin diskSpace and Planetary Science0103 physical sciencesAstrophysics::Earth and Planetary Astrophysics010303 astronomy & astrophysicsAstrophysics::Galaxy AstrophysicsAstrophysics - Cosmology and Nongalactic Astrophysicsdescription
Using microlensing measurements from a sample of 27 image-pairs of 19 lensed quasars we determine a maximum likelihood estimate for the accretion disk size of an {{\em}average} quasar of $r_s=4.0^{+2.4}_{-3.1} $ light days at rest frame $=1736$\AA\ for microlenses with a mean mass of $=0.3M_\odot$. This value, in good agreement with previous results from smaller samples, is roughly a factor of 5 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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2012-01-16 |