J/ApJS/263/10 2015, 2018-2021 sp. monitoring of NGC 5548 (Lu+, 2022)
Supermassive black hole and broad-line region in NGC 5548: results from
five-season reverberation mapping.
Lu K.-X., Bai J.-M., Wang J.-M., Hu C., Li Y.-R., Du Pu, Xiao M.,
Feng H.-C., Li S.-S., Wang J.-G., Zhang Z.-X., Huang Y.-K.
<Astrophys. J. Suppl. Ser., 263, 10 (2022)>
=2022ApJS..263...10L 2022ApJS..263...10L
ADC_Keywords: Active gal. nuclei; Spectra, optical
Keywords: Active galactic nuclei ; Supermassive black holes ;
Reverberation mapping ; Time domain astronomy
Abstract:
NGC 5548 is one of the active galactic nuclei (AGNs) selected for our
long-term spectroscopic monitoring with the Lijiang 2.4m telescope,
aiming at investigating the origin and evolution of broad-line regions
(BLRs), accurately measuring the mass of supermassive black holes
(SMBHs), and understanding the structure and evolution of the AGN. We
have performed five-season observations for NGC 5548 with the median
sampling interval ranging from 1.25 to 3 days. The light curves of the
5100Å continuum and broad emission lines are measured after
subtracting contamination of the host galaxy starlight. The time lags
of the broad HeII, HeI, Hγ, and Hβ lines with respect to
the 5100Å continuum are obtained for each season and their mean
time lags over the five seasons are 0.69, 4.66, 4.60, and 8.43 days,
respectively. The Hγ and Hβ velocity-resolved lag profiles
in the seasons of 2015, 2018, 2019, and 2021 are constructed, from
which an "M-shaped" structure is found in 2015 but disappears after
2018. Our five- season reverberation mapping (RM) yields an average
virial SMBH mass of M*/107M☉=14.22, with a small standard
deviation of 1.89. By combining the previous 18 RM campaigns and our
five-season campaign for NGC 5548, we find that there exists a time
lag of 3.5yr between the changes in the BLR size and optical
luminosity. In addition, we construct the BLR radius-luminosity
relation and the virial relation for NGC 5548.
Description:
After the season of 2015, we continuously monitored NGC 5548 between
2018 and 2021.
The spectroscopic observations of NGC 5548 were taken using the Yunnan
Faint Object Spectrograph and Camera (YFOSC) mounted on the Lijiang
2.4m telescope, which is located in the Lijiang observatory of Yunnan
Observatories, Chinese Academy of Sciences.
In total we obtained 315 spectroscopic observations for NGC 5548. In
each season, the observations generally spanned January to June. The
median sampling intervals of the five seasons range from 1.25 to 3d.
Objects:
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RA (ICRS) DE Designation(s)
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14 17 59.54 +25 08 12.6 NGC 5548 = QSO J1417+2508
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 70 315 Light curves
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See also:
J/ApJ/510/659 : Size and Structure of AGN in NGC 5548 (Peterson+, 1999)
J/ApJ/613/682 : AGN central masses & broad-line region sizes (Peterson+, 2004)
J/A+A/417/515 : I Zw 1 unusual emission line spectrum (Veron-Cetty+, 2004)
J/ApJ/683/L115 : Intermediate-line region in quasars (Hu+, 2008)
J/ApJS/189/15 : FeII emission in a sample of AGN spectra (Kovacevic+, 2010)
J/ApJ/736/86 : FeII emission in SDSS type 1 AGNs (Dong+, 2011)
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/ApJS/225/29 : NGC 5548 43 year-long monitoring in Hβ (Bon+, 2016)
J/ApJ/827/118 : A new reverberation mapping campaign on NGC 5548 (Lu+, 2016)
J/ApJ/851/21 : SDSS RM project first year of observations (Grier+, 2017)
J/ApJ/837/131 : Space telescope RM project. V. NGC5548 monitoring (Pei+, 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/886/42 : Reverberation mapping & opt. spectra data of AGNs (Du+, 2019)
J/ApJ/887/135 : V-band, 5100Å and broad emission LCs of Mrk 79 (Lu+, 2019)
J/ApJ/877/23 : SEAMBHs. X. RM campaign compilation (Lu+, 2019)
J/ApJ/896/1 : SEAMBHs. XI. Mrk 142 X-ray to optical LCs (Cackett+, 2020)
J/ApJS/253/20 : SEAMBHs XII. Reberberation mapping for 15 PG QSOs (Hu+, 2021)
J/ApJS/258/38 : Iron template spectrum from Mrk493 HST/STIS obs. (Park+, 2022)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 9 F9.1 d JD Julian Date of Observation
11- 15 F5.3 10-17W/m2/nm F5100 [2.76/9.3] AGN continuum at 5100Å,
10-15erg/s/cm2/Å
17- 21 F5.3 10-17W/m2/nm e_F5100 [0.18/0.6] Error of F5100
23- 27 F5.3 10-16W/m2 FHeII [0/4.7] Broad He II, integrated over
best-fitted profile, 10-13erg/s/cm2
29- 33 F5.3 10-16W/m2 e_FHeII [0.049/0.3] Error of FHeII
35- 39 F5.3 10-16W/m2 FHeI [0.226/2.95] Broad He I, integrated
over best-fitted profile,
10-13erg/s/cm2
41- 45 F5.3 10-16W/m2 e_FHeI [0.08/0.3] Error of FHeI
47- 51 F5.3 10-16W/m2 FHgamma [1.12/5.3] Broad Hγ, integrated
over best-fitted profile,
10-13erg/s/cm2
53- 57 F5.3 10-16W/m2 e_FHgamma [0.1/0.4] Error of FHgamma
59- 64 F6.3 10-16W/m2 FHbeta [4/10.1] Broad Hβ, integrated over
best-fitted profile, 10-13erg/s/cm2
66- 70 F5.3 10-16W/m2 e_FHbeta [0.13/0.4] Error of FFHbeta
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 22-Nov-2022