J/ApJ/905/75 3yrs spectroscopic light curves of PG0026+129 (Hu+, 2020)
Evidence for two distinct broad-line regions from reverberation mapping of
PG 0026+129.
Hu C., Li S.-S., Guo W.-J., Yang S., Yang Z.-X., Bao D.-W., Jiang B.-W.,
Du P., Li Y.-R., Xiao M., Songsheng Y.-Y., Yu Z., Bai J.-M., Ho L.C.,
Bian W.-H., Brotherton M.S., Yuan Y.-F., Aceituno J., Winkler H.,
Wang J.-M., The SEAMBH collaboration
<Astrophys. J., 905, 75 (2020)>
=2020ApJ...905...75H 2020ApJ...905...75H
ADC_Keywords: Spectra, optical; QSOs
Keywords: Supermassive black holes ; Seyfert galaxies ;
Active galactic nuclei ; Quasars ; Reverberation mapping ;
Time domain astronomy
Abstract:
We report on the results of a new spectroscopic monitoring campaign of
the quasar PG 0026+129 at the Calar Alto Observatory 2.2m telescope
from 2017 July to 2020 February. Significant variations in the fluxes
of the continuum and broad emission lines, including Hβ and HeII,
were observed in the first and third years, and clear time lags
between them are measured. The broad Hβ line profile consists of
two Gaussian components: an intermediate-width HβIC with an
FWHM of 1964±18km/s and another very broad HβVBC with an FWHM
of 7570±83km/s. HβIC has long time lags of ∼40-60days in the
rest frame, while HβVBC shows nearly zero time delay with
respect to the optical continuum at 5100Å. The velocity-resolved
delays show consistent results: lags of ∼30-50days at the core of the
broad Hβ line and roughly zero lags at the wings. HβIC has
a redshift of ∼400km/s, which seems to be stable for nearly 30yr by
comparing with archived spectra, and may originate from an infall. The
rms spectrum of HβVBC shows a double-peaked profile with
brighter blue peak and extended red wing in the first year, which
matches the signature of a thin disk. Both the double-peaked profile
and the near-zero lag suggest that HβVBC comes from a region
associated with the part of the accretion disk that emits the optical
continuum. Adopting the FWHM (in the rms spectrum) and the time lag
measured for the total Hβ line, and a virial factor of 1.5, we
obtain a virial mass of 2.89-0.69+0.60x107M☉ for the
central black hole in this quasar.
Description:
Since 2017 May, we started a large reverberation mapping campaign
using the CAHA 2.2m telescope at the Calar Alto Observatory in Spain.
This campaign is an expansion of the super-Eddington accreting massive
black hole (SEAMBH) project (Du+ 2014, J/ApJ/782/45).
PG 0026+129 was observed for 47 epochs between 2017-July and
2018-February, 41 epochs between 2018-June and 2019-February, and
39 epochs between 2019-August and 2020-February. For each epoch,
broadband images and long-slit spectra were taken by the Calar Alto
Faint Object Spectrograph (CAFOS).
Objects:
----------------------------------------------------------
RA (ICRS) DE Designation(s)
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00 29 13.70 +13 16 03.9 PG 0026+129 = QSO B0026+1259
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 160 121 Light curves of the 5100Å continuum and
emission lines
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See also:
J/ApJ/269/352 : Quasar evolution (Schmidt+, 1983)
J/ApJS/140/143 : HST FOS spectral atlas (Bechtold+, 2002)
J/AJ/126/1720 : ugriz and Hα of double-peaked AGN (Strateva+, 2003)
J/ApJ/613/682 : AGN central masses & broad-line region sizes (Peterson+, 2004)
J/AJ/130/381 : Blueshifted [O III] emission (Boroson+, 2005)
J/ApJ/683/L115 : Intermediate-line region in quasars (Hu+, 2008)
J/ApJ/687/78 : FeII emission in quasars (Hu+, 2008)
J/ApJS/189/15 : FeII emission in a sample of AGN spectra (Kovacevic+, 2010)
J/ApJS/201/23 : Spectroscopy of 88 z<0.7 SDSS QSOs (Eracleous+, 2012)
J/ApJ/782/45 : SEAMBHs. I. Mrk 142, Mrk 335, and IRAS F12397+3333 (Du+, 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/ApJS/225/29 : NGC 5548 43 year-long monitoring in Hβ (Bon+, 2016)
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/866/133 : Continuum-Hβ light curves of 5 Seyfert 1 (De Rosa+, 2018)
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/870/123 : Swift optical & UV flux of four AGNs (Edelson+, 2019)
J/ApJ/890/71 : LCs of PG2130+099 (Hu+, 2020)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 16 F16.8 d JD Julian Date of observation
18- 28 E11.5 cW/m2/nm F5100 [2.5e-15/3.4e-15] 5100Å continuum flux
in erg/s/cm2/Å units
30- 40 E11.5 cW/m2/nm e_F5100 [2.3e-18/8.9e-18] Uncertainty in F5100
42- 52 E11.5 mW/m2 FHeII [2.2e-14/6.4e-14] HeII line flux,
in erg/s/cm2 units
54- 64 E11.5 mW/m2 e_FHeII [6.2e-16/2.4e-15] Uncertainty in FHeII
66- 76 E11.5 mW/m2 FHbVBC [1e-13/1.5e-13] Very broad Hβ
component flux, in erg/s/cm2 units
78- 88 E11.5 mW/m2 e_FHbVBC [8e-16/2.9e-15] Uncertainty in FHbVBC
90-100 E11.5 mW/m2 FHbIC [3.6e-14/6.4e-14] Intermediate-width
Hβ component flux, in erg/s/cm2
102-112 E11.5 mW/m2 e_FHbIC [4.4e-16/1.8e-15] Uncertainty in FHbIC
114-124 E11.5 mW/m2 FHbtot [1.5e-13/2.1e-13] Hbeta total flux,
in erg/s/cm2 units
126-136 E11.5 mW/m2 e_FHbtot [6e-16/2.3e-15] Uncertainty in FHbtot
138-148 E11.5 mW/m2 FFeII [4.7e-14/1.1e-13] FeII line flux,
in erg/s/cm2 units
150-160 E11.5 mW/m2 e_FFeII [8.8e-16/3.4e-15] Uncertainty in FFeII
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 22-Jul-2022