J/ApJ/887/38 SDSS RM Project: CIV lags & LCs from 4yrs of data (Grier+, 2019)
The Sloan Digital Sky Survey Reverberation Mapping Project: initial CIV lag
results from four years of data.
Grier C.J., Shen Y., Horne K., Brandt W.N., Trump J.R., Hall P.B.,
Kinemuchi K., Starkey D., Schneider D.P., Ho L.C., Homayouni Y., Li J.I.-H.,
McGreer I.D., Peterson B.M., Bizyaev D., Chen Y., Dawson K.S.,
Eftekharzadeh S., Guo Y., Jia S., Jiang L., Kneib J.-P., Li F., Li Z.,
Nie J., Oravetz A., Oravetz D., Pan K., Petitjean P., Ponder K.A.,
Rogerson J., Vivek M., Zhang T., Zou Hu
<Astrophys. J., 887, 38 (2019)>
=2019ApJ...887...38G 2019ApJ...887...38G
ADC_Keywords: QSOs; Spectra, optical; Redshifts; Photometry, VRI; Surveys
Keywords: Reverberation mapping ; Quasars ; Active galactic nuclei ;
Supermassive black holes
Abstract:
We present reverberation-mapping (RM) lags and black hole mass
measurements using the CIVλ1549 broad emission line from a
sample of 348 quasars monitored as a part of the Sloan Digital Sky
Survey RM Project. Our data span four years of spectroscopic and
photometric monitoring for a total baseline of 1300 days, allowing us
to measure lags up to ∼750days in the observed frame (this corresponds
to a rest-frame lag of ∼300days in a quasar at z=1.5 and ∼190days at
z=3). We report significant time delays between the continuum and the
CIVλ1549 emission line in 48 quasars, with an estimated
false-positive detection rate of 10%. Our analysis of marginal lag
measurements indicates that there are on the order of ∼100 additional
lags that should be recoverable by adding more years of data from the
program. We use our measurements to calculate black hole masses and
fit an updated CIV radius-luminosity relationship. Our results
significantly increase the sample of quasars with CIV RM results, with
the quasars spanning two orders of magnitude in luminosity toward the
high-luminosity end of the CIV radius-luminosity relation. In
addition, these quasars are located at some of the highest redshifts
(z∼1.4-2.8) of quasars with black hole masses measured with RM.
Description:
The parent sample of quasars consists of the 849 quasars monitored in
the SDSS-RM field; details of this sample are provided by
Shen+ 2019ApJS..241...34S 2019ApJS..241...34S
We obtained the spectra used in this study during the first four years
of observations for the SDSS-RM campaign. The spectra were acquired
with the BOSS spectrograph, which covers a wavelength range of
∼3560-10400Å. The spectrograph has a spectral resolution of R∼2000
and the data are binned to 69km/s per pixel. We obtained a total of
68 epochs between 2014 January and 2017 July, with observations taken
between January and July in each year only, leaving a gap of six months
between observing seasons.
To improve the cadence of our continuum light curves, we also
monitored the SDSS-RM field in the g and i bands with the Steward
Observatory Bok 2.3m telescope with the Bok/90Prime instrument on Kitt
Peak from 2014 to 2017, and the 3.6m CFHT/MegaCam on Maunakea from
2014 to 2016.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 85 348 Quasar sample information
table2.dat 38 282489 Light curves
table5.dat 44 348 Observed-frame lag measurements and significance
parameters for the entire sample
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See also:
V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)
VII/289 : SDSS quasar catalog, sixteenth data release (DR16Q) (Lyke+, 2020)
J/ApJ/613/682 : AGN central masses & broad-line region sizes (Peterson+, 2004)
J/ApJ/632/799 : NGC4395 light curves (Peterson+, 2005)
J/ApJS/166/470 : SDSS-Spitzer type I QSOs IR photometry (Richards+, 2006)
J/ApJ/698/895 : Variations in QSOs optical flux (Kelly+, 2009)
J/ApJ/716/993 : LAMP: reverberation mapping of H and He lines (Bentz+, 2010)
J/ApJS/194/45 : QSO properties from SDSS-DR7 (Shen+, 2011)
J/ApJ/755/60 : Reverberation mapping for 5 Seyfert 1 galaxies (Grier+, 2012)
J/other/Sci/338.1445 : Relativistic jets from BH systems (Nemmen+, 2012)
J/ApJ/746/169 : Luminosity function of broad-line quasars (Shen+, 2012)
J/ApJ/777/168 : CIV and SiIV BAL troughs in SDSS (Filiz+, 2013)
J/ApJ/779/109 : Long-term monitoring of NGC 5548 (Peterson+, 2013)
J/ApJ/782/45 : SEAMBHs. I. Mrk 142, Mrk 335, and IRAS F12397+3333 (Du+, 2014)
J/ApJ/791/88 : C IV BAL troughs properties in quasars (Filiz+, 2014)
J/ApJS/217/26 : Lick AGN monitoring 2011: light curves (Barth+, 2015)
J/ApJ/806/128 : Space telescope RM project. I. NGC5548 (De Rosa+, 2015)
J/ApJ/811/91 : SDSS-RM project: z<1 QSO host galaxies (Matsuoka+, 2015)
J/ApJS/216/4 : SDSS-RM project: technical overview (Shen+, 2015)
J/ApJ/805/96 : SDSS-RM project: velocity dispersions of QSOs (Shen+, 2015)
J/ApJ/814/150 : Variability of SDSS broad absorption line QSOs (Wang+, 2015)
J/ApJ/825/126 : SEAMBHs. V. The third year (Du+, 2016)
J/ApJ/821/56 : Space telescope RM project. III. LCs (Fausnaugh+, 2016)
J/ApJ/818/30 : Lag measurements for z<0.8 QSOs from the SDSS-RM (Shen+, 2016)
J/MNRAS/465/2120 : Correcting CIV-based virial BH masses (Coatman+, 2017)
J/ApJ/840/97 : Optical RM campaign of 5 AGNs (Fausnaugh+, 2017)
J/ApJ/851/21 : SDSS RM project first year of observations (Grier+, 2017)
J/ApJ/865/56 : Emission line & R-band continuum LCs of 17 QSOs (Lira+, 2018)
J/ApJ/870/123 : Swift optical & UV flux of four AGNs (Edelson+, 2019)
J/ApJ/872/21 : SDSS RM project: <10day CIV BAL variability (Hemler+, 2019)
J/ApJ/880/126 : SDSS RM project: continuum lags (Homayouni+, 2019)
J/ApJ/882/4 : SDSS-RM project: Hα, Hβ & MgII lines (Wang+, 2019)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I03 --- RMID [0/835]? Reverberation Mapping Identifier
5- 23 A19 --- SDSS SDSS identifier
25- 32 F8.4 deg RAdeg [211.3/216.2] Right Ascension (J2000) (1)
34- 40 F7.4 deg DEdeg [51.6/54.5] Declination (J2000) (1)
42- 46 F5.3 --- z [1.35/4.33] Spectroscopic redshift (2)
48- 53 F6.3 mag imag [16.45/21.7] Uncorrected i band PSF
magnitude (2)
55- 60 F6.3 [10-7W] logL1350 [44.49/46.95] Log 1350 Angstrom luminosity;
in erg/s (2)
62- 66 F5.3 [10-7W] e_logL1350 [0/1] Uncertainty in logL1350
67 A1 --- f_logL1350 [*] Flag on logL1350 (3)
69- 73 F5.2 [Msun] logM [7.2/9.9]? Log black hole mass (2)
75- 79 F5.2 [Msun] e_logM [0/1.1]? Uncertainty in logM (4)
81- 85 F5.1 --- S/N2 [20.2/126.8] PrepSpec S/N2 measurement (5)
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Note (1): These measurements were made as a part of the SDSS Data Release 10
(Ahn+ 2014ApJS..211...17A 2014ApJS..211...17A).
Note (2): These measurements were retrieved from Shen+ 2019ApJ...883L..14S 2019ApJ...883L..14S
Note (3):
* = Where logL1350 was not available; in these cases we converted
L1700 to L1350 using measurements from Richards+ 2006, J/ApJS/166/470
Note (4): Black hole mass uncertainties listed here include measurement
uncertainties only; the estimated systematic uncertainties beyond
those listed is 0.4dex.
Note (5): To characterize the variability, we measured the CIV light curve
variability signal-to-noise ratio (S/N) using the quantity S/N2, which
is an output from the PrepSpec software (see Section 2.2 for a
discussion of PrepSpec). S/N2 is defined as (χ2-DOF)0.5, where
χ2 is calculated against the average of the light curve flux
(using the measurement uncertainties of the light curves σi),
and DOF is the degrees of freedom, which is equal to the number of
points in the light curve -1.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- --- [RM]
4- 6 I03 --- RMID Reverberation Mapping Identifier
8- 16 F9.4 d MJD [6660.2/7960.31] Modified Julian Date;
MJD-50000
18- 21 A4 --- Band Observational band ("C IV"=CIV emission line)
23 A1 --- Tel Telescope code (1)
25- 31 F7.2 --- Flux [-34.5/2032] Flux density (2)
33- 38 F6.2 --- e_Flux [0/282] Uncertainty in Flux (2)
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Note (1): Telescope/Instrument as follows:
C = CFHT/MegaCam
B = Bok/90Prime;
S = SDSS BOSS spectrograph.
Note (2): In units of 10-17erg/s/cm2/Angstrom for the continuum flux
densities and 10-17erg/s/cm2 for integrated emission-line fluxes.
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 3 I03 --- RMID [0/835] Reverberation Mapping Identifier
5- 10 F6.1 d tauJav [-742.5/736.8] Best-fit time delay from JAVELIN
12- 16 F5.1 d E_tauJav [2.9/630.6] Upper uncertainty in tauJav
18- 22 F5.1 d e_tauJav [3.3/404.1] Lower uncertainty in tauJav
24- 27 F4.2 --- Rej [0/0.87] Fraction of posterior samples rejected
29- 33 F5.2 --- rmax [-0.55/0.96] Maximum correlation coefficient
35- 39 F5.2 --- SNRcon [0/26] Signal-to-noise ratio in the continuum
41- 44 F4.2 --- SNRline [0/5.5] Signal-to-noise ratio in the line
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 10-May-2021