J/ApJ/862/123 griz light curves of 15 DES quasars (Mudd+, 2018)
Quasar accretion disk sizes from continuum reverberation mapping from the
Dark Energy Survey.
Mudd D., Martini P., Zu Y., Kochanek C., Peterson B.M., Kessler R.,
Davis T.M., Hoormann J.K., King A., Lidman C., Sommer N.E., Tucker B.E.,
Asorey J., Hinton S., Glazebrook K., Kuehn K., Lewis G.,
Macaulay E., Moeller A., O'Neill C., Zhang B., Abbott T.M.C.,
Abdalla F.B., Allam S., Banerji M., Benoit-Levy A., Bertin E., Brooks D.,
Rosell A.C., Carollo D., Kind M.C., Carretero J., Cunha C.E., D'Andrea C.B.,
da Costa L.N., Davis C., Desai S., Doel P., Fosalba P.,
Garcia-Bellido J., Gaztanaga E., Gerdes D.W., Gruen D., Gruendl R.A.,
Gschwend J., Gutierrez G., Hartley W.G., Honscheid K., James D.J.,
Kuhlmann S., Kuropatkin N., Lima M., Maia M.A.G., Marshall J.L.,
McMahon R.G., Menanteau F., Miquel R., Plazas A.A., Romer A.K.,
Sanchez E., Schindler R., Schubnell M., Smith M., Smith R.C.,
Soares-Santos M., Sobreira F., Suchyta E., Swanson M.E.C., Tarle G.,
Thomas D., Tucker D.L., Walker A.R.
<Astrophys. J., 862, 123 (2018)>
=2018ApJ...862..123M 2018ApJ...862..123M
ADC_Keywords: QSOs; Photometry, ugriz; Redshifts
Keywords: accretion, accretion disks ; galaxies: active ; quasars: general
Abstract:
We present accretion disk size measurements for 15 luminous quasars at
0.7≤z≤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. From this, we are only able to constrain
upper limits on disk sizes, as many are consistent with no lag the
2σ level. The second method fits the model parameters for the
canonical 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 and 1 times the Eddington rate. Given our large
uncertainties, our measurements are also consistent with disk size
measurements from gravitational microlensing studies of strongly
lensed quasars, as well as other photometric reverberation mapping
results, that find disk sizes that are a factor of a few (∼3) larger
than predictions.
Description:
The Dark Energy Survey (DES; Flaugher 2005IJMPA..20.3121F 2005IJMPA..20.3121F ; Dark
Energy Survey Collaboration+ 2016MNRAS.460.1270D 2016MNRAS.460.1270D) is a five-year,
five-band, optical, photometric survey covering 5000 square degrees of
the southern sky, starting in 2013, using the Dark Energy Camera on
the Victor M. Blanco 4m telescope near the Cerro Tololo Inter-American
Observatory near La Serena, Chile.
As part of the supernova search, 30 square degrees are be repeatedly
observed on an approximately weekly cadence in the g, r, i, and z
filters for the duration of DES, amounting to 20-30 epochs per filter
per year.
In these fields, we also have a set of spectroscopically verified
quasars from the OzDES program (Australian DES/optical redshifts for
DES; Yuan+ 2015MNRAS.452.3047Y 2015MNRAS.452.3047Y & Childress+ 2017, J/MNRAS/472/273) as
part of the DES and OzDES reverberation mapping project.
From the combination of these two surveys, we use the first three
years of photometry and spectra for the 771 quasars that we continue
to monitor (Diehl+ 2016SPIE.9910E..1DD).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 56 15 Sample description
table2.dat 55 3959 DES quasar light curves
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See also:
J/ApJ/613/682 : AGN masses & broad-line region sizes (Peterson+, 2004)
J/ApJ/622/129 : Lag-luminosity relationship in AGN (Sergeev+, 2005)
J/ApJ/755/60 : Reverberation mapping for 5 Seyfert 1 galaxies (Grier+, 2012)
J/ApJ/788/48 : X-ray through NIR photometry of NGC 2617 (Shappee+, 2014)
J/ApJ/806/128 : Space telescope RM project. I. NGC5548 (De Rosa+, 2015)
J/ApJ/806/129 : Space telescope RM project. II. Swift data (Edelson+, 2015)
J/ApJ/821/56 : Space telescope RM proj. III. NGC5548 LCs (Fausnaugh+, 2016)
J/MNRAS/472/273 : OzDES DR1 (Childress+, 2017)
J/ApJ/836/186 : Continuum-band lags in SDSS QSOs from PS1 obs. (Jiang+, 2017)
J/ApJ/837/131 : Space telescope RM proj. V. NGC 5548 sp. (Pei+, 2017)
J/AJ/153/107 : Australian Dark Energy Survey (OzDES) QSO cat. (Tie+, 2017)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 A3 --- --- [DES]
5-24 A20 --- DES Quasar name (JHHMMSS.ss+DDMMSS.ss)
26-33 F8.5 deg RAdeg [33.7/54.4] Right ascension (J2000)
35-43 F9.5 deg DEdeg [-26.5/0.2] Declination (J2000)
45-48 F4.2 --- z [0.6/1.9] Redshift
from Childress+ 2017, J/MNRAS/472/273
50-51 A2 --- Field SN field (1)
53-56 F4.2 10+9Msun MBH [0.04/1.2] BH mass (2)
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Note (1): "SN Field" denotes the supernova field in which the quasar resides
(Flaugher 2005IJMPA..20.3121F 2005IJMPA..20.3121F & Flaugher+ 2015AJ....150..150F 2015AJ....150..150F).
Note (2): Note that all masses have an uncertainty of 0.4dex, calculated using
the McLure & Jarvis (2002MNRAS.337..109M 2002MNRAS.337..109M) relationship for MgII.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 A3 --- --- [DES]
5- 24 A20 --- DES Quasar name (JHHMMSS.ss+DDMMSS.ss)
26- 34 F9.3 d MJD [56534.2/57428.1] Modified Julian Date
36- 44 F9.6 mag mag [18.8/21.3] Apparent AB magnitude in Band
46- 53 F8.6 mag e_mag [0.002/0.4] Uncertainty in mag
55- 55 A1 --- Band Observational passband (griz)
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 30-Jul-2019