J/ApJ/851/21 SDSS RM project first year of observations (Grier+, 2017)
The Sloan Digital Sky Survey Reverberation Mapping Project: Hα and Hβ
reverberation measurements from first-year spectroscopy and photometry.
Grier C.J., Trump J.R., Shen Y., Horne K., Kinemuchi K., McGreer I.D.,
Starkey D.A., Brandt W.N., Hall P.B., Kochanek C.S., Chen Y., Denney K.D.,
Greene J.E., Ho L.C., Homayouni Y., Li J.I.-H., Pei L., Peterson B.M.,
Petitjean P., Schneider D.P., Sun M., AlSayyad Y., Bizyaev D., Brinkmann J.,
Brownstein J.R., Bundy K., Dawson K.S., Eftekharzadeh S.,
Fernandez-Trincado J.G., Gao Y., Hutchinson T.A., Jia S., Jiang L.,
Oravetz D., Pan K., Paris I., Ponder K.A., Peters C., Rogerson J.,
Simmons A., Smith R., Wang a.R.
<Astrophys. J., 851, 21 (2017)>
=2017ApJ...851...21G 2017ApJ...851...21G
ADC_Keywords: QSOs ; Spectra, optical; Photometry, SDSS; Surveys
Keywords: galaxies: active ; galaxies: nuclei ; quasars: emission lines ;
quasars: general
Abstract:
We present reverberation mapping results from the first year of
combined spectroscopic and photometric observations of the Sloan
Digital Sky Survey Reverberation Mapping Project. We successfully
recover reverberation time delays between the g+i band emission and
the broad Hβ emission line for a total of 44 quasars, and for the
broad Hα emission line in 18 quasars. Time delays are computed
using the JAVELIN and CREAM software and the traditional interpolated
cross-correlation function (ICCF): using well-defined criteria, we
report measurements of 32 Hβ and 13 Hα lags with JAVELIN,
42 Hβ and 17 Hα lags with CREAM, and 16 Hβ and eight
Hα lags with the ICCF. Lag values are generally consistent among
the three methods, though we typically measure smaller uncertainties
with JAVELIN and CREAM than with the ICCF, given the more physically
motivated light curve interpolation and more robust statistical
modeling of the former two methods. The median redshift of our
Hβ-detected sample of quasars is 0.53, significantly higher than
that of the previous reverberation mapping sample. We find that in
most objects, the time delay of the Hα emission is consistent
with or slightly longer than that of Hβ. We measure black hole
masses using our measured time delays and line widths for these
quasars. These black hole mass measurements are mostly consistent with
expectations based on the local MBH-σ* relationship, and are
also consistent with single-epoch black hole mass measurements. This
work increases the current sample size of reverberation-mapped active
galaxies by about two- thirds and represents the first large sample of
reverberation mapping observations beyond the local universe (z<0.3).
Description:
The Sloan Digital Sky Survey Reverberation Mapping Project (SDSS-RM)
is a dedicated multiobject RM program that began in 2014 (see Shen+,
J/ApJS/216/4 for details).
SDSS-RM started as an ancillary program of the SDSS-III survey
(Eisenstein+ 2011AJ....142...72E 2011AJ....142...72E) on the SDSS 2.5m telescope,
monitoring 849 quasars in a single field with the Baryon Oscillation
Spectroscopic Survey (BOSS) spectrograph.
Additional photometric data were acquired with the 3.6m
Canada-France-Hawaii Telescope (CFHT) and the Steward Observatory 2.3m
Bok telescope to improve the cadence of the continuum light curves.
Observations for the program have continued in 2015-2017 as part of
SDSS-IV (Blanton+ 2017AJ....154...28B 2017AJ....154...28B) to extend the temporal baseline
of the program.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 72 222 Quasar sample information
table2.dat 54 152258 Final emission-line light curves of
all 222 quasars
table4.dat 110 44 Line width, virial product, and MBH measurements
for Hβ; from erratum published in
2018, ApJ, 868, 76
table5.dat 110 18 Line width, virial product, and MBH measurements
for Hα; from erratum published in
2018, ApJ, 868, 76
--------------------------------------------------------------------------------
See also:
J/AJ/128/1761 : HATNET variability survey (Hartman+, 2004)
J/ApJ/613/682 : AGN central masses & broad-line region sizes (Peterson+, 2004)
J/ApJ/622/129 : Lag-luminosity relationship in AGN (Sergeev+, 2005)
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 five Seyfert 1 gal. (Grier+, 2012)
J/ApJ/782/45 : SEAMBHs. I. Mrk 142, Mrk 335, and IRAS F12397+3333 (Du+, 2014)
J/ApJ/788/48 : X-ray through NIR photometry of NGC 2617 (Shappee+, 2014)
J/ApJS/217/26 : Lick AGN monitoring 2011: light curves (Barth+, 2015)
J/ApJ/806/22 : SEAMBHs IV. Hβ time lags (Du+, 2015)
J/ApJ/806/129 : Space telescope RM project. II. Swift data (Edelson+, 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/825/126 : SEAMBHs. V. The third year (Du+, 2016)
J/ApJ/821/56 : Space telescope RM project. III. NGC5548 LCs (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/840/97 : Optical RM campaign of 5 AGNs (Fausnaugh+, 2017)
J/ApJ/836/186 : Continuum-band lags in SDSS QSOs from PS1 obs. (Jiang+, 2017)
J/ApJ/837/131 : Space telescope RM project. V. NGC5548 sp. (Pei+, 2017)
http://www.sdss3.org/ : SDSS-III home page
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- RMID [5/848] Reverberation mapping identifier
5- 23 A19 --- SDSS SDSS Identifier (JHHMMSS.ss+DDMMSS.s)
25- 32 F8.4 deg RAdeg [211.2/216.1] Right Ascension (J2000) (1)
34- 40 F7.4 deg DEdeg [51.6/54.6] Declination (J2000) (1)
42- 46 F5.3 --- z [0.1/1.2] Spectroscopic redshift (1)
48- 53 F6.3 mag imag [17.4/21.7] Uncorrected i band PSF AB
magnitude (1)
55- 58 F4.1 --- SNR [1.2/41.3] Median signal-to-noise ratio (2)
60- 63 F4.1 [10-7W] logAGN [0/45.4]? Log AGN luminosity at 5100Å;
in erg/s units (3)
65- 68 F4.1 [10-7W] logHost [0/44.6]? Log host luminosity at 5100Å;
in erg/s units (3)
70- 72 F3.1 [Msun] logM [0/9.5]? Log single-epoch black hole mass (3)
--------------------------------------------------------------------------------
Note (1): These measurements were made as a part of the SDSS Data Release 10
(Ahn+ 2014ApJS..211...17A 2014ApJS..211...17A).
Note (2): Per SDSS pixel across each individual spectrum and across all
epochs (each SDSS pixel spans 69km/s).
Note (3): These measurements are taken from Shen+ (2015, J/ApJ/805/96).
logM estimates were made using the
Vestergaard & Peterson (2006ApJ...641..689V 2006ApJ...641..689V) prescription for L5100.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- RMID [5/848] Reverberation mapping identifier
5- 13 F9.4 d MJD [6649.4/6856.3] Modified Julian Date;
MJD-50000
15- 20 A6 --- Band Observed band (1)
22 A1 --- Tel Telescope code (2)
24- 30 F7.2 10-19W/m2/nm Flux [-157.4/413.3]? Continuum flux in Band
(g or i); in 1e-17erg/s/cm2/Angstrom units
32- 37 F6.2 10-19W/m2/nm e_Flux [0.05/142]? Uncertainty in Flux
39- 45 F7.2 10-20W/m2 S [-857.5/2646.2]? Integrated flux
in Band (Halpha or Hbeta);
in units of 1e-17erg/s/cm2
47- 52 F6.2 10-20W/m2 e_S [0.9/487]? Uncertainty in Flux
54 I1 --- Flag [0/1] Observation flag
(1=rejected for analysis) (3)
--------------------------------------------------------------------------------
Note (1): g (75346 occurrences), i (68160 occurrences),
Halpha (1685 occurrences) or Hbeta (7067 occurrences) emission lines.
Note (2): Telescope code as follows:
C = CFHT (35786 occurrences);
B = the Steward Observatory 2.3m Bok telescope (94005 occurrences);
S = SDSS (22467 occurrences).
Note (3): Emission-line epochs with a "1" were identified as outliers
and excluded from the light curves in our analysis.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table[45].dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 A2 --- --- [RM]
4- 6 I3 --- RMID [16/840] Reverberation mapping identifier
8- 12 F5.3 --- z [0.1/1.1] Redshift
14- 17 F4.1 d tau [3.9/80.2] Adopted lag τfinal (1)
19- 22 F4.1 d e_tau [0.5/15.5] Negative uncertainty on tau
24- 27 F4.1 d E_tau [0.4/23.7] Positive uncertainty on tau
29- 32 I4 km/s Sig [776/7078] Mean line width
σline,mean (2)
34- 36 I3 km/s e_Sig [1/536] sigma uncertainty
38- 41 I4 km/s rmsSig [740/9475] rms line width
σline,rms (2)
43- 44 I2 km/s e_rmsSig [6/71] rms uncertainty
46- 50 I5 km/s FWHM [1070/18920] Mean FWHM (2)
52- 55 I4 km/s e_FWHM [3/5983] FWHM uncertainty
57- 61 I5 km/s rmsFWHM [1575/21468] rms FWHM (2)
63- 66 I4 km/s e_rmsFWHM [11/2120] rmsFWHM uncertainty
68- 71 F4.1 10+7Msun VP [0.1/38] Virial product
73- 77 F5.2 10+7Msun e_VP [0/16] Negative uncertainty on VP
79- 83 F5.2 10+7Msun E_VP [0/16] Positive uncertainty on VP
85- 89 F5.1 10+7Msun MBH [0.4/170] Black hole mass (3)
91- 94 F4.1 10+7Msun e_MBH [0.1/72] Negative uncertainty on MBH
96- 99 F4.1 10+7Msun E_MBH [0.1/69] Positive uncertainty on MBH
101-105 F5.1 km/s sig* [57/215]? Fiducial stellar velocity
dispersion σ* (4)
107-110 F4.1 km/s e_sig* [1.9/25.6]? sig* uncertainty
--------------------------------------------------------------------------------
Note (1): Measurements are in the quasar rest frame. If the lag is detected by
JAVELIN (Zu+ 2011ApJ...735...80Z 2011ApJ...735...80Z, 2013ApJ...765..106Z 2013ApJ...765..106Z), we use the
JAVELIN-reported lag by default; otherwise, we use the CREAM-reported
lag (CREAM model; Starkey+ 2016MNRAS.456.1960S 2016MNRAS.456.1960S).
Note (2): Line widths are measured using PrepSpec (Shen+ 2016, J/ApJ/818/30 ;
2015, J/ApJS/216/4). The mean line widths are measured from the broad
component only, and the rms line widths do not include the continuum.
Note (3): Virial products were converted to MBH using f=4.47, as measured by
Woo et al. (2015ApJ...801...38W 2015ApJ...801...38W).
Note (4): From Shen et al. (2015, J/ApJ/805/96).
--------------------------------------------------------------------------------
History:
From electronic version of the journal
28-Sep-2018:Insert into VizieR
11-Feb-2019: Tables 4 and 5 updated for versions published in erratum
2018, ApJ, 868, 76
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 05-Jul-2018