J/ApJS/278/61 Supermassive BH with accretion rates in AGN. XIV. (Hu+, 2025)
Supermassive black holes with high accretion rates in active galactic nuclei.
XIV. Long-duration high-cadence reverberation mapping results for 11 PG quasars.
Hu C., Yao Z.-H., Chen Y.-J., Songsheng Y.-Y., Wang Y.-L., Yang S.,
Zhang H., Guo W.-J., Du Pu, Li Y.-R., Xiao M., Liu J.-R., Bai H.-R.,
Fang F.-N., Fu Y.-X., Peng Y.-C., Zhai S., Bai J.-M., Ho L.C.,
Brotherton M.S., Aceituno J., Winkler H., Wang J.-M.,
SEAMBH collaboration
<Astrophys. J. Suppl. Ser., 278, 61 (2025)>
=2025ApJS..278...61H 2025ApJS..278...61H
ADC_Keywords: QSOs; Active gal. nuclei; Spectra, optical; Photometry;
Extinction; Redshifts; Black holes
Keywords: Supermassive black holes ; Seyfert galaxies ; Active galactic nuclei ;
Quasars ; Reverberation mapping ; Time domain astronomy
Abstract:
We report the results of a long-duration high-cadence reverberation
mapping campaign of a second batch of 11 PG quasars using the 2.2m
telescope at the Calar Alto Observatory. This follows a similar
earlier study of another sample of 15 objects reported by
Hu+ (2021, J/ApJS/253/20). Among the 11 PG quasars, eight objects have
the Hβ time lags measured for the first time, while the other
three objects were observed in previous campaigns but only had highly
uncertain Hβ-lag measurements. Long-term light curves are
presented of photometric V-band, spectroscopic 5100Å continuum, and
the Hβ emission line, lasting for ∼3-6yr with a cadence of
∼6-14d. Accurate Hβ time lags ranging from ∼20 to 150 days in the
rest frame are obtained. The estimated virial masses of the central
supermassive black holes range from ~(3-300)x107M☉. Combining
these results with those reported in Hu+ (2021), we now have 26 PG
quasars, with representative properties, having reliable Hβ
time-lag measurements from our long-duration high-cadence campaign. A
tentative fit to the relation between the Hβ time lag and the
continuum luminosity for these 26 objects gives a slope of 0.53.
Description:
The observations of four objects in this sample, PG 0157+001,
PG_1411+442, PG 1444+407, and PG 2233+134, began in 2017. The other
seven objects in this paper were added to our campaign later.
Our observations have a cadence of ∼5-10days for all of the targets
except PG 1121+422. See Table 1.
The spectra were taken by the Calar Alto Faint Object Spectrograph
(CAFOS) on the CAHA 2.2m telescope, with Grism G-200 and a long slit
set to a 3.0"-wide projection on the sky.
Before taking the spectra, three broadband Johnson V-filter images
were taken by CAFOS in the imaging mode.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 63 11 Objects and observations
table4.dat 45 3571 Light curves
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See also:
J/A+A/358/77 : Hamburg/ESO survey for bright QSOs. III. (Wisotzki+, 2000)
J/ApJ/613/682 : AGN central masses & broad-line region sizes (Peterson+, 2004)
J/AJ/130/873 : Properties of BQS objects in the SDSS DR3 area (Jester+, 2005)
J/ApJ/755/60 : Reverberation mapping for 5 Seyfert 1 galaxies (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/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/869/142 : Monitoring AGNs with Hβ Asymmetry (MAHA). I. (Du+, 2018)
J/ApJ/856/6 : SEAMBHs IX. 10 new Hβ light curves (Du+, 2018)
J/ApJ/886/42 : Reverberation mapping & opt. spectra data of AGNs (Du+, 2019)
J/ApJ/876/102 : Reverberation mapping of the Seyfert Zw I 1 (Huang+, 2019)
J/ApJ/905/75 : 3yrs spectroscopic light curves of PG0026+129 (Hu+, 2020)
J/ApJ/890/71 : 5100Å cont. & emission lines LCs of PG2130+099 (Hu+, 2020)
J/ApJS/253/20 : SEAMBHs XII. Reberberation mapping for 15 PG QSOs (Hu+, 2021)
J/ApJ/920/9 : YFOSC light curves of PG 0923+201 and PG 1001+291 (Li+, 2021)
J/ApJS/262/14 : AGNs with Hβ asymmetry. III. 15 PG quasars (Bao+, 2022)
J/ApJ/925/52 : LAMP 2016: velocity-resolved Hb lags in Seyfert gal. (U+, 2022)
J/ApJS/272/29 : MAHA. IV. Reberberation mapping for 14 AGNs (Zastrocky+, 2024)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- --- [PG]
4- 11 A8 --- PG PG name of the quasar (HHMM+DDd; B1950)
13- 20 A8 --- OName Other name
22- 27 F6.4 --- z [0.06/0.5] Redshift
29- 33 F5.3 mag Av [0.026/0.2] V-band Galactic extinction
35- 37 I3 --- Nobs [41/171] Number of spectroscopic epochs
39- 40 I2 d Tmed [6/14] Median time interval
42- 45 I4 d Dur [899/2018] Duration of the
spectroscopic monitoring
47- 50 I4 yr start.Y Start date of the observation, year (UT)
52- 54 A3 "month" start.M Start date of the observation, month (UT)
55 A1 --- --- [-]
56- 59 I4 yr end.Y End date of the observation, year (UT)
61- 63 A3 "month" end.M End date of the observation, month (UT)
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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- 8 A8 --- PG PG name of the quasar (HHMM+DDd; B1950)
10- 13 A4 --- x_Flux Name of the flux measurement (1)
15- 25 F11.3 d JD [2457883.49/2460501.4] Julian Date of observation
27- 35 E9.3 --- Flux [4.9e-16/4.8] Flux
37- 45 E9.3 --- e_Flux [7.2e-19/0.08] Statistical uncertainty in Flux
--------------------------------------------------------------------------------
Note (1): Flux measurements are as follows:
V = V-band instrumental magnitude in mag units
5100 = spectroscopic 5100 Angstrom continuum in 10-15erg/s/cm2/Å units
Hb = Broad Hβ line flux in 10-13erg/s/cm2 units
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History:
From electronic version of the journal
License: CC-BY-4.0
References:
Du et al. Paper I. 2014ApJ...782...45D 2014ApJ...782...45D Cat. J/ApJ/782/45
Wang et al. Paper II. 2014ApJ...793..108W 2014ApJ...793..108W Cat. J/ApJ/793/108
Hu et al. Paper III. 2015ApJ...804..138H 2015ApJ...804..138H
Du et al. Paper IV. 2015ApJ...806...22D 2015ApJ...806...22D Cat. J/ApJ/806/22
Du et al. Paper V. 2016ApJ...825..126D 2016ApJ...825..126D Cat. J/ApJ/825/126
Du et al. Paper VI. 2016ApJ...820...27D 2016ApJ...820...27D
Xiao et al. Paper VII. 2018ApJ...864..109X 2018ApJ...864..109X
Li et al. Paper VIII. 2018ApJ...869..137L 2018ApJ...869..137L
Du et al. Paper IX. 2018ApJ...856....6D 2018ApJ...856....6D Cat. J/ApJ/856/6
Lu et al. Paper X. 2019ApJ...877...23L 2019ApJ...877...23L Cat. J/ApJ/877/23
Cackett et al. Paper XI. 2020ApJ...896....1C 2020ApJ...896....1C Cat. J/ApJ/896/1
Hu et al. Paper XII. 2021ApJS..253...20H 2021ApJS..253...20H Cat. J/ApJS/253/20
Khatu et al. Paper XIII. 2023ApJ...958..127K 2023ApJ...958..127K Cat. J/ApJ/958/127
Hu et al. Paper XIV. 2025ApJS..278...61H 2025ApJS..278...61H This catalog
Bai et al. Paper XV. 2026ApJS..282...56B 2026ApJS..282...56B
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 20-Feb-2026