Size of the Accretion Disk in the Graviationally Lensed Quasar SDSS J1004+4112 from the Statistics of Microlensing Magnifications

Fian, C.; Mediavilla, E.; Hanslmeier, A.; Oscoz, A.; Serra-Ricart, M.; Muñoz, J. A.; Jiménez-Vicente, J.
Referencia bibliográfica

The Astrophysical Journal, Volume 830, Issue 2, article id. 149, 6 pp. (2016).

Fecha de publicación:
10
2016
Número de autores
7
Número de autores del IAC
4
Número de citas
27
Número de citas referidas
24
Descripción
We present eight monitoring seasons of the four brightest images of the gravitational lens SDSS J1004+4112 observed between 2003 December and 2010 October. Using measured time delays for the images A, B, and C and the model predicted time delay for image D we have removed the intrinsic quasar variability, finding microlensing events of about 0.5 and 0.7 mag of amplitude in the images C and D. From the statistics of microlensing amplitudes in images A, C, and D, we have inferred the half-light radius (at {λ }{rest}=2407 \mathringA ) for the accretion disk using two different methods, {R}1/2={8.7}-5.5+18.5\sqrt{M/0.3{M}ȯ } (histogram product) and {R}1/2={4.2}-2.2+3.2\sqrt{M/0.3{M}ȯ } lt-days ({χ }2). The results are in agreement within uncertainties with the size predicted from the black hole mass in SDSS J1004+4112 using thin disk theory.