J/ApJS/272/13 Changing-look AGN. I. Main sequence transition (Panda+, 2024)
Changing-look active galactic nuclei.
I. Tracking the transition on the main sequence of quasars.
Panda S., Sniegowska M.
<Astrophys. J. Suppl. Ser., 272, 13 (2024)>
=2024ApJS..272...13P 2024ApJS..272...13P
ADC_Keywords: Active gal. nuclei; Spectra, optical; Redshifts;
Equivalent widths; Black holes
Keywords: Quasars ; Active galactic nuclei ; Spectroscopy ; Catalogs ;
Supermassive black holes
Abstract:
This paper is the first in a series of papers that prepare and analyze
spectral and other properties for a database of already-discovered
changing-look active galactic nuclei (CL AGNs). Here we focus on the
spectral fitting and analysis of broad emission lines in a sample of
93 CL AGNs collected from the literature with existing Sloan Digital
Sky Survey (SDSS)/Baryon Oscillation Spectroscopic Survey
(BOSS)/extended-BOSS spectroscopy where the Hβ emission-line
profile does not completely disappear in any epochs. Additionally, we
have gathered older/newer spectral epochs from all the available SDSS
data releases to make the database more complete. We use PyQSOFit and
perform a homogeneous spectral decomposition of all of our SDSS
spectra and tabulate the AGN continuum and emission-line properties
per epoch per source, chronologically. This further allows us to
categorize the sources in our sample as Turn-On or Turn-Off and
subsequently check for repeated occurrences of such phases. We then
estimate the black hole mass (MBH) and the Eddington ratio
(λEdd) per epoch per source where the required parameters are
available and well estimated. We demonstrate the movement of the
source in the MBH-λEdd plane, allowing us to check for
systematic changes in the source's fundamental properties. We then
track their transition along the optical plane of the Eigenvector 1
schema and categorize sources that either stay within the same
population (A or B) or make an interpopulation movement as a function
of spectral epoch. We also test the Balmer decrement
(Hα/Hβ) of a subset of our sample of CL AGNs as a function
of time and AGN luminosity.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 110 383 Details of the sources in our sample
table3.dat 117 329 Spectral param. for the sample using PyQSOFit - I
table4.dat 124 329 Spectral param. for the sample using PyQSOFit - II
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See also:
V/154 : Sloan Digital Sky Surveys (SDSS), Release 16 (DR16) (Ahumada+, 2020)
VII/289 : SDSS quasar catalog, sixteenth data release (DR16Q) (Lyke+, 2020)
J/ApJ/613/682 : AGN central masses (Peterson+, 2004)
J/A+A/422/925 : Profile variability in lines of NGC 5548 (Shapovalova+ 2004)
J/ApJS/166/470 : SDSS-Spitzer type I QSOs IR photometry (Richards+, 2006)
J/ApJS/166/128 : Narrow line Seyfert 1 galaxies from SDSS-DR3 (Zhou+, 2006)
J/MNRAS/383/581 : Broad-line Balmer decrements in blue AGN (Dong+, 2008)
J/A+A/486/99 : Long-term sp. variability of NGC 4151 (Shapovalova+, 2008)
J/ApJS/189/15 : FeII emission in a sample of AGN spectra (Kovacevic+, 2010)
J/ApJ/788/159 : 17 Seyfert 1 galaxies light curves (Koshida+, 2014)
J/ApJS/217/26 : Lick AGN monitoring 2011: light curves (Barth+, 2015)
J/ApJ/806/128 : Space telescope RM project. I. NGC5548 (De Rosa+, 2015)
J/MNRAS/455/2918 : Phot. & line luminosities for ASASSN-14li (Holoien+, 2016)
J/MNRAS/463/296 : PS1 slow-blue nuclear hypervariables (Lawrence+, 2016)
J/ApJ/827/118 : A new reverberation mapping campaign on NGC 5548 (Lu+, 2016)
J/ApJ/821/33 : Broad Hb emission line in Seyfert galaxies (Runco+, 2016)
J/ApJ/851/21 : SDSS RM project first year of observations (Grier+, 2017)
J/ApJ/837/131 : Space telescope RM project. V. NGC5548 (Pei+, 2017)
J/ApJS/229/39 : Narrow line Sy1 galaxies from SDSS-DR12 (Rakshit+, 2017)
J/A+A/615/A167 : Catalog of NLS1s galaxies in 6dFGS survey (Chen+, 2018)
J/ApJ/854/160 : SDSS & DES long-term variability QSOs (Rumbaugh+, 2018)
J/ApJ/880/46 : Sp. & V-band monitoring of CTS C30.10 (Czerny+, 2019)
J/ApJ/886/42 : Reverberation mapping & opt. sp. data of AGNs (Du+, 2019)
J/ApJ/874/8 : Follow-up sp. of SDSS changing-look QSOs (Macleod+, 2019)
J/ApJ/886/150 : VRI and K-band light curves of type 1 AGNs (Minezaki+, 2019)
J/ApJS/241/34 : SDSS Reverberation Mapping (SDSS-RM) project (Shen+, 2019)
J/ApJ/887/15 : Xinglong sp. of two changing-look SDSS AGNs (Wang+, 2019)
J/MNRAS/491/4925 : Changing-state quasars with CRTS (Graham+, 2020)
J/A+A/642/A150 : Quasars as standard candles. III. (Lusso+, 2020)
J/ApJS/249/17 : SDSS QSO DR14 spectral properties (Rakshit+, 2020)
J/ApJ/933/180 : TDSS. Changing-look quasars candidates (Green+, 2022)
J/ApJS/258/38 : Iron template sp. from Mrk493 HST/STIS obs. (Park+, 2022)
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 A12 --- Sample Reference paper (G1)
14- 17 A4 --- --- [SDSS]
18- 36 A19 --- SDSS SDSS identifier for the source
(JHHMMSS.ss+DDMMSS.s)
38- 42 I5 --- Plate [314/11678] SDSS Plate ID
44- 48 I5 d MJD [51641/58523] SDSS date of observation
(JD-2400000.5)
50- 52 I3 --- Fiber [3/983] SDSS Fiber ID
54- 65 F12.8 deg RAdeg Right ascension (J2000)
67- 78 F12.9 deg DEdeg [-8.7/64] Declination (J2000)
80- 89 F10.8 --- zspec [0.02/4.73] Spectroscopic redshift from SDSS
91- 108 A18 --- Source Original source used to collect the spectrum (1)
110 A1 --- Flag Flag on Excluded sources (2)
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Note (1): Spectrum sources as follows:
ELG_NGC = Emission Line Galaxies North Galactic Cap;
ELG_SGC = Emission Line Galaxies South Galactic Cap;
RM = Reverberation Mapping;
XMMXLL = objects identified from the XMM-Newton XXL
survey [2011MNRAS.414..992G 2011MNRAS.414..992G];
boss = Baryon Oscillation Spectroscopic Survey
(BOSS, Dawson+ 2013AJ....145...10D 2013AJ....145...10D);
commissioning = commissioning observing runs;
eboss = extended-BOSS (eBOSS,
Dawson+ 2016AJ....151...44D 2016AJ....151...44D);
legacy = The SDSS Legacy Survey;
photoz = sources from the photometric redshift catalog
in the SDSS;
segue2 = Sloan Extension for Galactic Understanding and
Exploration-2;
seguefaint = Sloan Extension for Galactic Understanding and
Exploration Faint;
sequels = Sloan Extended Quasar, ELG, and LRG Survey;
southern = The southern observations taken with the Irenee
du Pont Telescope at Las Campanas Observatory;
specialplatesNGC = special plates for the North Galactic Cap selected by
the SDSS collaboration for a series of specialized
science programs;
specialplatesS82 = special plates for the Stripe 82 region selected by
the SDSS collaboration for a series of specialized
science programs.
Note (2): Flag as follows:
X = Sources marked with X have either wrong redshift, noisy
spectrum with no broad Hbeta detected, or problems with the FITS file.
Such sources are removed from further analysis.
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Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 A12 --- Sample Reference paper (G1)
14- 17 A4 --- --- [SDSS]
18- 36 A19 --- SDSS SDSS identifier for the source
38- 42 I5 d MJD [51783/58522] SDSS date of observation
(JD-2400000.5)
44- 48 F5.2 [10-7W] logL3000 [43.16/45.4]? AGN continuum luminosity (in
log-scale) at 300nm
50- 53 F4.2 [10-7W] e_logL3000 [0/0.03]? Error on logL3000
55- 59 F5.2 [10-7W] logL5100 [41.5/45.3] AGN continuum luminosity (in
log-scale) at 510nm
61- 64 F4.2 [10-7W] e_logL5100 [0/0.02] Error on logL5100
66- 70 F5.2 [10-7W] logL6000 [41.76/45.22]? AGN continuum luminosity (in
log-scale) at 600nm
72- 75 F4.2 [10-7W] e_logL6000 [0.01/0.06]? Error on logL6000
77- 82 F6.2 0.1nm EWMgII [0.2/388]? Equivalent width of MgII
84- 88 F5.2 0.1nm e_EWMgII [0.39/58]? Error on EWMgII
90- 95 F6.2 0.1nm EWHb [11/904] Equivalent width of Hβ
97- 102 F6.2 0.1nm e_EWHb [0.2/128] Error on the EWHb
104- 110 F7.2 0.1nm EWHa [6.7/1579]? Equivalent width of Hα
112- 117 F6.2 0.1nm e_EWHa [0.9/164]? Error on EWHa
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Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 A12 --- Sample Reference paper (G1)
14- 17 A4 --- --- [SDSS]
18- 36 A19 --- SDSS SDSS identifier for the source
38- 42 I5 d MJD [51783/58522] SDSS date of observation
(JD-2400000.5)
44- 51 F8.2 km.s-1 FWHMHb [2823/30484] FWHM of the broad Hb component
53- 59 F7.2 km.s-1 e_FWHMHb [0.05/9079] Error on FWHMHb
61- 64 F4.2 --- RFe [0/1.11]? Ratio of the EW(FeII) between
443.4-468.4nm to EW (Hb)
66- 70 F5.2 --- e_RFe [0/0.4]? Error on the RFe
72- 76 F5.2 [10-7W] logL5100 [41.55/45.3] AGN continuum luminosity (in
log-scale) at 510nm
79- 82 F4.2 [10-7W] e_logL5100 [0/0.02] Error on logL5100
84- 88 F5.2 [10-7W] logLbol [42.5/46.3] AGN bolometric luminosity
(in log-scale)
90- 93 F4.2 [10-7W] e_logLbol [0/0.02] Error on logLbol
95- 99 F5.2 [Msun] logMBH [6.8/10.1] Black hole mass (in log-scale)
101-105 F5.2 [Msun] e_logMBH [0/2] Error on logMBH
107-111 F5.2 [-] logEddr [-3.01/-0.5] Eddington ratio (in log-scale)
113-116 F4.2 [-] e_logEddr [0/2] Error on logEddr
118-124 F7.3 10+37W delL5100 [-11.6/9.8] Change in AGN luminosity at
510nm (1)
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Note (1): Difference between the AGN luminosity at 510nm of the source
observed at a given MJD to the first observation of the same source.
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Global notes:
Note (G1): Reference papers as follows:
Graham+2020 = 2020MNRAS.491.4925G 2020MNRAS.491.4925G (Cat. J/MNRAS/491/4925)
Green+2022 = 2022ApJ...933..180G 2022ApJ...933..180G (Cat. J/ApJ/933/180)
LaMassa+2015 = 2015ApJ...800..144L 2015ApJ...800..144L
MacLeod+2016 = 2016MNRAS.457..389M 2016MNRAS.457..389M
Potts+2021 = 2021A&A...650A..33P 2021A&A...650A..33P
Ruan+2016 = 2016ApJ...826..188R 2016ApJ...826..188R
Runco+2016 = 2016ApJ...821...33R 2016ApJ...821...33R (Cat. J/ApJ/821/33)
Runnoe+2016 = 2016MNRAS.455.1691R 2016MNRAS.455.1691R
Wang+2018 = 2018ApJ...858...49W 2018ApJ...858...49W
Wang+2019 = 2019ApJ...887...15W 2019ApJ...887...15W (Cat. J/ApJ/887/15)
Yang+2018 = 2018ApJ...862..109Y 2018ApJ...862..109Y
Yu+2020 = 2020MNRAS.498.3985Y 2020MNRAS.498.3985Y
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 08-Aug-2024