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Title: Quasar Accretion Disk Sizes With Continuum Reverberation Mapping From the Dark Energy Survey

Abstract

We present accretion disk size measurements for 15 luminous quasars at $$0.7 \leq z \leq 1.9$$ derived from $griz$ light curves from the Dark Energy Survey. We measure the disk sizes with continuum reverberation mapping using two methods, both of which are derived from the expectation that accretion disks have a radial temperature gradient and the continuum emission at a given radius is well-described by a single blackbody. In the first method we measure the relative lags between the multiband light curves, which provides the relative time lag between shorter and longer wavelength variations. The second method fits the model parameters for the canonical Shakura-Sunyaev thin disk directly rather than solving for the individual time lags between the light curves. Our measurements demonstrate good agreement with the sizes predicted by this model for accretion rates between 0.3-1 times the Eddington rate. These results are also in reasonable agreement with disk size measurements from gravitational microlensing studies of strongly lensed quasars, as well as other photometric reverberation mapping results.

Authors:
;
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Org.:
DES
OSTI Identifier:
1423227
Report Number(s):
arXiv:1711.11588; FERMILAB-PUB-17-506-E
1641493
DOE Contract Number:
AC02-07CH11359
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophys.J.
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

Mudd, D., and et al.. Quasar Accretion Disk Sizes With Continuum Reverberation Mapping From the Dark Energy Survey. United States: N. p., 2017. Web.
Mudd, D., & et al.. Quasar Accretion Disk Sizes With Continuum Reverberation Mapping From the Dark Energy Survey. United States.
Mudd, D., and et al.. Thu . "Quasar Accretion Disk Sizes With Continuum Reverberation Mapping From the Dark Energy Survey". United States. doi:. https://www.osti.gov/servlets/purl/1423227.
@article{osti_1423227,
title = {Quasar Accretion Disk Sizes With Continuum Reverberation Mapping From the Dark Energy Survey},
author = {Mudd, D. and et al.},
abstractNote = {We present accretion disk size measurements for 15 luminous quasars at $0.7 \leq z \leq 1.9$ derived from $griz$ light curves from the Dark Energy Survey. We measure the disk sizes with continuum reverberation mapping using two methods, both of which are derived from the expectation that accretion disks have a radial temperature gradient and the continuum emission at a given radius is well-described by a single blackbody. In the first method we measure the relative lags between the multiband light curves, which provides the relative time lag between shorter and longer wavelength variations. The second method fits the model parameters for the canonical Shakura-Sunyaev thin disk directly rather than solving for the individual time lags between the light curves. Our measurements demonstrate good agreement with the sizes predicted by this model for accretion rates between 0.3-1 times the Eddington rate. These results are also in reasonable agreement with disk size measurements from gravitational microlensing studies of strongly lensed quasars, as well as other photometric reverberation mapping results.},
doi = {},
journal = {Astrophys.J.},
number = ,
volume = ,
place = {United States},
year = {Thu Nov 30 00:00:00 EST 2017},
month = {Thu Nov 30 00:00:00 EST 2017}
}