Volume 646, February 2021
|Number of page(s)||10|
|Published online||22 February 2021|
Resolving the inner accretion flow towards the central supermassive black hole in SDSS J1339+1310⋆
Departamento de Física Moderna, Universidad de Cantabria, Avda. de Los Castros s/n, 39005 Santander, Spain
e-mail: firstname.lastname@example.org; email@example.com
2 O.Ya. Usikov Institute for Radiophysics and Electronics, National Academy of Sciences of Ukraine, 12 Acad. Proscury St., 61085 Kharkiv, Ukraine
3 Institute of Astronomy of V.N. Karazin Kharkiv National University, Svobody Sq. 4, 61022 Kharkiv, Ukraine
4 Department of Physics, United States Naval Academy, 572C Holloway Rd., Annapolis, MD 21402, USA
5 Institute of Radio Astronomy of the National Academy of Sciences of Ukraine, 4 Mystetstv St., 61002 Kharkiv, Ukraine
Accepted: 25 December 2020
We studied the accretion disc structure in the doubly imaged lensed quasar SDSS J1339+1310 using r-band light curves and UV-visible to near-IR spectra from the first 11 observational seasons after its discovery. The 2009−2019 light curves displayed pronounced microlensing variations on different timescales, and this microlensing signal permitted us to constrain the half-light radius of the 1930 Å continuum-emitting region. Assuming an accretion disc with an axis inclined at 60° to the line of sight, we obtained log(r1/2/cm) = 15.4−0.4+0.93. We also estimated the central black hole mass from spectroscopic data. The width of the C IV, Mg II, and Hβ emission lines, and the continuum luminosity at 1350, 3000, and 5100 Å, led to log(MBH/M⊙) = 8.6 ± 0.4. Thus, hot gas responsible for the 1930 Å continuum emission is likely orbiting a 4.0 × 108 M⊙ black hole at an r1/2 of only a few tens of Schwarzschild radii.
Key words: accretion / accretion disks / gravitational lensing: micro / gravitational lensing: strong / quasars: individual: SDSS J1339+1310 / quasars: supermassive black holes
Tables 1, 3 and 4 are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (188.8.131.52) or via http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/646/A165
© ESO 2021
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