Time Delay and Accretion Disk Size Measurements in the Lensed Quasar SBS 0909+532 from Multiwavelength Microlensing Analysis
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Hainline, Laura J.; Morgan, Christopher W.; MacLeod, Chelsea L.; Landaal, Zachary D.; Kochanek, C. S.; Harris, Hugh C.; Tilleman, Trudy; Goicoechea Santamaría, Luis Julián; Shalyapin, Vyacheslav; Falco, Emilio E.Fecha
2013-09Derechos
© 2013. The American Astronomical Society.
Publicado en
The Astrophysical Journal, 2013, 774(1), 69
Editorial
American Astronomical Society
Institute of Physics
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Palabras clave
Accretion, accretion disks
Gravitational lensing: micro
Gravitational lensing: strong
Quasars: individual (SBS 0909+532)
Resumen/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 ΔtAB = 50+2 −4 days, where the stated uncertainties represent the bounds of the formal 1σ 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{(rs,r/cm)[cos i/0.5]1/2} = 15.3 ± 0.3 and log{(rs,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.
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