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Time delay and accretion disk size measurements in the lensed quasar SBS 0909+532 from multiwavelength microlensing analysis

Abstract: We present three complete seasons and two half-seasons of Sloan Digital Sky Survey (SDSS) r-band photometry of the gravitationally lensed quasar SBS 0909+532 from the U.S. Naval Observatory, as well as two seasons each of SDSS g-band and r-band monitoring from the Liverpool Robotic Telescope. Using Monte Carlo simulations to simultaneously measure the system's time delay and model the r-band microlensing variability, we confirm and significantly refine the precision of the system's time delay to , where the stated uncertainties represent the bounds of the formal 1? confidence interval. There may be a conflict between the time delay measurement and a lens consisting of a single galaxy. While models based on the Hubble Space Telescope astrometry and a relatively compact stellar distribution can reproduce the observed delay, the models have somewhat less dark matter than we would typically expect. We also carry out a joint analysis of the microlensing variability in the r and g bands to constrain the size of the quasar's continuum source at these wavelengths, obtaining log {(r s,r /cm)[cos i/0.5]1/2} = 15.3 ± 0.3 and log {(r s, g /cm)[cos i/0.5]1/2} = 14.8 ± 0.9, respectively. Our current results do not formally constrain the temperature profile of the accretion disk but are consistent with the expectations of standard thin disk theory.

 Fuente: Astrophysical Journal, 2013, 774(1), 69

 Editorial: Institute of Physics Publishing

 Fecha de publicación: 01/09/2013

 Nº de páginas: 11

 Tipo de publicación: Artículo de Revista

 DOI: 10.1088/0004-637X/774/1/69

 ISSN: 0004-637X,1538-4357

 Url de la publicación: https://doi.org/10.1088/0004-637X/774/1/69

Autoría

HAINLINE, LAURA J.

MORGAN, CHRISTOPHER W.

MACLEOD, CHELSEA L.

LANDAAL, ZACHARY D.

KOCHANEK, C. S.

HARRIS, HUGH C.

VYACHESLAV NICKOLAYEVICH SHALYAPIN

FALCO, EMILIO E.