J/ApJS/250/10 SDSS-RM AGNs CFHT & Bok photometry over 4yrs (Kinemuchi+, 2020)
The Sloan Digital Sky Survey Reverberation Mapping project: photometric g and i
light curves.
Kinemuchi K., Hall P.B., McGreer I., Kochanek C.S., Grier C.J., Trump J.,
Shen Y., Brandt W.N., Wood-Vasey W.M., Fan X., Peterson B.M.,
Schneider D.P., Hernandez Santisteban J.V., Horne K., Chen Y.,
Eftekharzadeh S., Guo Y., Jia S., Li F., Li Z., Nie J., Ponder K.A.,
Rogerson J., Zhang T., Zou Hu, Jiang L., Ho L.C., Kneib J.-P., Petitjean P.,
Palanque-Delabrouille N., Yeche C.
<Astrophys. J. Suppl. Ser., 250, 10 (2020)>
=2020ApJS..250...10K 2020ApJS..250...10K
ADC_Keywords: Active gal. nuclei; Photometry, SDSS; Surveys
Keywords: Active galactic nuclei
Abstract:
The Sloan Digital Sky Survey (SDSS) Reverberation Mapping program
monitors 849 active galactic nuclei (AGNs) both spectroscopically and
photometrically. The photometric observations used in this work span
over 4yr and provide an excellent baseline for variability studies of
these objects. We present the photometric light curves from 2014 to
2017 obtained by the Steward Observatory's Bok telescope and the
Canada-France-Hawaii telescope with MegaCam. We provide details on the
data acquisition and processing of the data from each telescope, the
difference imaging photometry used to produce the light curves, and
the calculation of a variability index to quantify each AGN's
variability. We find that the Welch-Stetson J index provides a useful
characterization of AGN variability and can be used to select AGNs for
further study.
Description:
In this work, we present the details of the photometric data from the
CFHT and Bok telescopes obtained during the first 4yr (2014-2017) of
the Sloan Digital Sky Survey Reverberation Mapping (SDSS-RM) project
(Shen+ 2015, J/ApJS/216/4).
The CFHT/MegaCam is a wide-field optical imager with a pixel scale of
0.187". All MegaCam observations were made in the Queued Service
Observations mode, and a log of the observations is presented in Table 1.
See Section 2.1 for further details.
Monitoring of the SDSS-RM field with Steward Observatory's 2.3m Bok
telescope commenced in 2013 December and is ongoing. As with the CFHT
observations, Bok data are collected in the SDSS g and i bandpasses.
Table 3 provides the log of the Bok observations over the 4yr.
See Section 2.2 for further details.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 84 75 Log of CFHT observations
table3.dat 77 99 Log of Bok observations
table4.dat 81 1214 SDSS-RM objects with the Welch-Stetson variability
index in SDSS g and i-band
sdssrmlcs.fits 2880 53512 FITS file with 1214 extensions providing the
g and i light curves for the 1214 objects
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Description of file:
sdssrmlcs.fits available on the FTP contains 1214 extensions.
Each extension contains 15 columns:
(1) ID number
(2) Band identifier
(3) Detector identifier
(4) Modified Julian date (days)
(5) First differential flux (counts)
(6) Error in first differential flux (counts)
(7) Second differential flux (counts)
(8) Error in second differential flux (counts)
(9) First sky background measurement (counts)
(10) Second sky background measurement (counts)
(11) Local average sky background measurement over Nsky pixels (counts)
(12) Local median sky background measurement over Nsky pixels (counts)
(13) Number of sky pixels (pixels)
(14) Aperture flux over N pixels (counts)
(15) Number of pixels (pixels)
Columns 4-15 contain 350 values each.
See also:
V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)
J/ApJ/613/682 : AGN central masses & broad-line region sizes (Peterson+, 2004)
J/ApJ/777/168 : CIV & SiIV broad absorption line troughs in SDSS (Filiz+, 2013)
J/ApJ/788/48 : X-ray through NIR photometry of NGC 2617 (Shappee+, 2014)
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/821/56 : Space telescope RM project. III. NGC 5548 (Fausnaugh+, 2016)
J/ApJ/831/7 : SDSS-RM project: peak velocities of QSOs (Shen+, 2016)
J/ApJ/818/30 : Lag measurements for 15 z<0.8 QSOs from SDSS-RM (Shen+, 2016)
J/ApJ/851/21 : SDSS RM project first year of observations (Grier+, 2017)
J/ApJ/854/107 : Light curves of 2 Seyfert 1 galaxies (Fausnaugh+, 2018)
J/ApJ/872/21 : SDSS RM project: <10day CIV BAL variability (Hemler+, 2019)
Byte-by-byte Description of file: table[13].dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- Set Semester
7- 11 I5 d MJD [56648/57964] Modified Julian Date
13- 22 A10 "Y:M:D" Date UT date of observation
24- 27 A4 --- Filt [g,i ] Filter(s)
29- 31 F3.1 arcsec Seeing [0.4/3.1] Average seeing
33- 55 A23 --- Weather Weather conditions
57- 84 A28 --- Comm Comment
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Seq [0/1213] Reverberation Mapping identifier
6- 15 F10.6 deg RAdeg [211.28/216.17] Right Ascension (J2000)
17- 25 F9.6 deg DEdeg [51.62/54.57] Declination (J2000)
27- 32 F6.4 --- z [0.08/4.43]? Redshift
34- 39 F6.3 mag gmag [16.8/25.2]? SDSS g band apparent (AB) magnitude
41- 46 F6.3 mag imag [16.4/24.1]? SDSS i band apparent (AB) magnitude
48- 55 F8.3 --- BokgVar [0.73/2345.1]? Bok g band variability index
57- 65 F9.3 --- BokiVar [-0.55/13308]? Bok i band variability index
67- 72 F6.3 --- CFHTgVar [-0.07/57.7]? CFHT g band variability index
74- 81 F8.3 --- CFHTiVar [-1.75/1362]? CFHT i band variability index
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History:
From electronic version of the journal
27-Nov-2020: Insert into VizieR
24-Feb-2021: Z in kpc corrected for z = redshift in Table 4
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 02-Nov-2020