A Microlensing Accretion Disk Size Measurement in the Lensed Quasar WFI 2026-4536

被引：24
|
作者：
Cornachione, Matthew A. [1 ]
Morgan, Christopher W. [1 ]
Millon, Martin [2 ]
Bentz, Misty C. [3 ]
Courbin, Frederic [2 ]
Bonvin, Vivien [2 ]
Falco, Emilio E. [4 ]
机构：
[1] US Naval Acad, Dept Phys, 572C Holloway Rd, Annapolis, MD 21402 USA
[2] Ecole Polytech Fed Lausanne EPFL, Observ Sauverny, Inst Phys, Lab Astrophys, CH-1290 Versoix, Switzerland
[3] Georgia State Univ, Dept Phys & Astron, Atlanta, GA 30303 USA
[4] Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA
来源：
ASTROPHYSICAL JOURNAL | 2020年 / 895卷 / 02期
基金：
欧洲研究理事会; 瑞士国家科学基金会; 美国国家科学基金会;
关键词：
ACTIVE GALACTIC NUCLEI; GRAVITATIONAL LENSES; X-RAY; TIME DELAYS; COSMOGRAIL; DECONVOLUTION; VARIABILITY; MODELS; MASSES; GALAXY;
D O I：
10.3847/1538-4357/ab557a
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We use 13 seasons of R-band photometry from the 1.2 m Leonard Euler Swiss Telescope at La Silla to examine microlensing variability in the quadruply imaged lensed quasar WFI 2026-4536. The lightcurves exhibit similar to 0.2 mag of uncorrelated variability across all epochs and a prominent single feature of similar to 0.1 mag within a single season. We analyze this variability to constrain the size of the quasar's accretion disk. Adopting a nominal inclination of 60 degrees, we find an accretion disk scale radius of (r(s)/cm)= 15.74(-0.29)(+0.34) at a rest frame wavelength of 2043 angstrom, and we estimate a black hole mass of log (M-BH/M-circle dot) 9.18(-0.34)(+0.39), based on the C IV line in VLT spectra. This size measurement is fully consistent with the quasar accretion disk size-black hole mass relation, providing another system in which the accretion disk is larger than predicted by thin-disk theory.
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页数：13
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