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Title: Quasar Accretion Disk Sizes from Continuum Reverberation Mapping in the DES Standard-star Fields

Journal Article · · The Astrophysical Journal. Supplement Series (Online)
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  1. The Ohio State Univ., Columbus, OH (United States)

Measurements of the physical properties of accretion disks in active galactic nuclei are important for better understanding the growth and evolution of supermassive black holes. We present the accretion disk sizes of 22 quasars from continuum reverberation mapping with data from the Dark Energy Survey (DES) standard-star fields and the supernova C fields. We construct continuum light curves with the griz photometry that span five seasons of DES observations. These data sample the time variability of the quasars with a cadence as short as 1 day, which corresponds to a rest-frame cadence that is a factor of a few higher than most previous work. We derive time lags between bands with both JAVELIN and the interpolated cross-correlation function method and fit for accretion disk sizes using the JAVELIN thin-disk model. These new measurements include disks around black holes with masses as small as ~107 M , which have equivalent sizes at 2500 Å as small as ~0.1 lt-day in the rest frame. We find that most objects have accretion disk sizes consistent with the prediction of the standard thin-disk model when we take disk variability into account. We have further simulated the expected yield of accretion disk measurements under various observational scenarios for the Large Synoptic Survey Telescope Deep Drilling Fields. We find that the number of disk measurements would increase significantly if the default cadence is changed from 3 days to 2 days or 1 day.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Argonne National Laboratory (ANL), Argonne, IL (United States); Univ. of Michigan, Ann Arbor, MI (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF); Australian Research Council; USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)
Contributing Organization:
DES Collaboration
Grant/Contract Number:
AC02-76SF00515; AC02-07CH11359; AC02-05CH11231; 1615553; AST-1138766; AST-536171; AST- 536171; AC05-00OR22725; AC02-06CH11357; SC0019193
OSTI ID:
1617149
Alternate ID(s):
OSTI ID: 1573821; OSTI ID: 1659594; OSTI ID: 1737594; OSTI ID: 1767966; OSTI ID: 1785526
Report Number(s):
arXiv:1811.03638; FERMILAB-PUB-18-621-AE; DES-2018-0403; TRN: US2106727
Journal Information:
The Astrophysical Journal. Supplement Series (Online), Vol. 246, Issue 1; ISSN 1538-4365
Publisher:
American Astronomical Society/IOPCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 28 works
Citation information provided by
Web of Science

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