J/ApJS/271/20 Broad emission line of 4FGL blazars (Chen+, 2024)
A study of broad emission line and Doppler factor estimation for Fermi blazars.
Chen G., Zheng Z., Zeng X., Zhang L., Xiao H., Liu X., Cui L., Fan J.
<Astrophys. J. Suppl. Ser., 271, 20 (2024)>
=2024ApJS..271...20C 2024ApJS..271...20C
ADC_Keywords: Active gal. nuclei; Gamma rays; Spectra, optical; Redshifts;
BL Lac objects; QSOs
Keywords: Blazars ; Active galactic nuclei ; High energy astrophysics ; Jets
Abstract:
In this work, we obtained a sample of 979 Fermi blazars with broad
emission lines, including 701 objects collected from published works
and 278 objects developed in this work. For the 278 objects, we made a
crossmatch from three catalogs, the Fermi Large Area Telescope Fourth
Source Catalog (4FGL), the Sloan Digital Sky Survey, and the Large Sky
Area Multi-Object Fiber Spectroscopic Telescope, and calculated the
broad-line region (BLR) luminosity. Then, we estimated the Doppler
factor and studied the correlations between the BLR luminosities and
the γ-ray luminosities, the synchrotron peak frequency (νp),
and Doppler factor (δ) for the whole sample. Our analyses and
discussions came to the following main conclusions: For the
278 blazars, their BLR luminosity (log LBLR) ranges from 40.44 to
45.45erg/s, with a mean value of 43.39erg/s. The Doppler factor ranges
from δ=0.45 to δ=88.52, with a mean value of 12.99 for the
979 Fermi blazars, which is consistent with the results in the
literature. Both the BLR luminosity and the Doppler factor exhibit
positive correlations with the γ-ray luminosity. The BLR
luminosity is anticorrelated with synchrotron peak frequency, implying
a Compton cooling. A line of logLBLR=1.58logνp-19.46 separating
BL Lacertae objects and flat-spectrum radio quasars was obtained in
the diagram of logLBLR against logνp using a machine-learning
method. Based on the analysis of the equivalent width and the Doppler
factors, we proposed five changing-look blazar candidates.
Description:
Our sample consists of two parts: one part is from the literature
(Paliya+ 2021 J/ApJS/253/46 and Zhang+ 2022ApJ...935....4Z 2022ApJ...935....4Z). We found
701 blazars in total with broad-line emissions and γ-ray
emissions from the literature.
For the second part, which is derived from the matching result, we
cross-identified 4FGL-DR4 objects with SDSS-DR16/LAMOST-DR8. This
procedure led to a sample comprising 278 spectra with broad emission
lines.
See Section 2 for further explanations.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 93 979 The sample of 979 Fermi blazars
table2.dat 95 278 The sample of 278 Fermi blazars whose optical
spectra exhibit at least one of the broad emission
lines Hα, Hβ, MgII, and CIV
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See also:
V/156 : LAMOST DR7 catalogs (Luo+, 2019)
V/154 : Sloan Digital Sky Surveys (SDSS), Release 16 (DR16) (Ahumada+, 2020)
IX/67 : Incremental Fermi LAT 4th source cat. (4FGL-DR3) (Fermi-LAT col., 2022)
J/A+A/436/799 : X- & gamma-ray fluxes of blazars (Fan+, 2005)
J/A+A/445/441 : SED of BL Lacertae objects (Nieppola+, 2006)
J/ApJS/194/45 : QSO properties from SDSS-DR7 (Shen+, 2011)
J/ApJ/748/49 : Opt. spectroscopy of 1LAC broad-line blazars (Shaw+, 2012)
J/other/RAA/13.259 : γ-ray Doppler factor for Fermi blazars (Fan+, 2013)
J/other/RAA/14.1135 : Doppler factor for a Fermi blazar sample (Fan+, 2014)
J/other/Nat/515.376 : Power of relativistic jets in blazars (Ghisellini+, 2014)
J/ApJS/226/20 : X-ray, opt. & radio SEDs of Fermi blazars (Fan+, 2016)
J/ApJS/224/26 : SEDs of Roma BZCAT blazars (Mao+, 2016)
J/ApJ/835/L38 : Fermi blazars with Doppler factors (Fan+, 2017)
J/ApJS/235/39 : Jet properties of γ-ray-loud 3FGL AGNs (Chen, 2018)
J/ApJ/866/137 : Blazars variability brightness temp. (Liodakis+, 2018)
J/MNRAS/490/4770 : Classifying Fermi-LAT gamma-ray sources (Kovacevic+, 2019)
J/ApJS/241/34 : SDSS Reverberation Mapping (SDSS-RM) project (Shen+, 2019)
J/ApJS/253/10 : 12yrs of R-band phot. of the quasar 3C 454.3 (Fan+, 2021)
J/ApJS/253/46 : Optical spectroscopy of Fermi blazars (Paliya+, 2021)
J/AJ/161/196 : Opt. view of blazars with LAMOST. I. (Pena-herazo+, 2021)
J/ApJS/263/24 : The 4LAC-DR3 catalog (Ajello+, 2022)
J/ApJ/925/97 : Fermi-LAT-detected blazars fundamental param. (Pei+, 2022)
J/ApJ/925/40 : Fermi blazar jet properties (Xiao+, 2022)
J/PASJ/74/239 : Radio dichotomy of active galactic nuclei (Xiao+, 2022)
J/ApJS/262/18 : Spectral energy distributions for 4FGL blazars (Yang+, 2022)
J/ApJ/925/120 : Luminosities & peak freq. of 4FGL blazars (Yang+, 2022)
http://fermi.gsfc.nasa.gov/ssc/data/access/lat/14yr_catalog/ : 4FGL-DR4
http://www.lamost.org/dr8/v2.0/ : LAMOST DR8 v2.0
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- 4FGL 4FGL-DR4 catalog identifier (JHHMM.m+DDMM)
16- 40 A25 --- Name Other name
42- 46 F5.3 --- z [0.027/4.4] Spectroscopic redshift
48 A1 --- C1 4FGL-DR4 catalog classification (1)
50- 52 A3 --- C2 Yang+ 2022, J/ApJS/262/18 classification
54- 57 F4.1 [Hz] lognu [12.1/18.2]? Log peak frequency (2)
59- 66 E8.2 mW/m2/sr F0.1-100 [5e-13/7.4e-10] The 0.1-100GeV gamma-ray
flux; erg/cm2/sr
68- 71 F4.2 --- alpha [1.4/3.3] 4FGL-DR4 catalog photon spectral
index
73- 77 F5.2 [10-7W] logLg [42.8/48.9] Log 0.1-100GeV gamma-ray
luminosity; erg/s
79- 83 F5.2 [10-7W] logLBLR [40.4/46.7] Log Broad-Line Region
luminosity; erg/s
85- 87 A3 --- r_logLBLR Reference code for logLBLR (3)
89- 93 F5.2 --- delta [0.45/88.6] Doppler factor from this work
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Note (1): 4FGL-DR4 catalog classification as follows:
B = BL Lac (384 sources)
F = FSRQ (595 sources)
Note (2): Where log(nu)<13.7 for LSPs, 13.7<log(nu)<14.9 for ISPs,
and log(nu)>14.9 for HSPs.
Note (3): Reference code for logLBLR as follows:
P21 = Paliya et al. (2011ApJS..253...46P 2011ApJS..253...46P)
Z22 = Zhang et al. (2022ApJ...935....4Z 2022ApJ...935....4Z)
TW = the broad-line region luminosity calculated in this work
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- 4FGL 4FGL-DR4 catalog identifier (JHHMM.m+DDMM)
14- 18 F5.3 --- z [0.04/4.1] Spectroscopic redshift
20 A1 --- Class Classification (1)
22- 29 F8.2 10-20W/m2 FHa [8.7/62567]? Halpha emission line flux;
1e-17erg/s/cm2
31- 36 F6.2 10-20W/m2 e_FHa [0/543]? Uncertainty in FHa
38- 45 F8.2 10-20W/m2 FHb [4.9/19028]? Hbeta emission line flux;
1e-17erg/s/cm2
47- 53 F7.2 10-20W/m2 e_FHb [3.8/1455]? Uncertainty in FHb
55- 61 F7.2 10-20W/m2 FMgII [8.2/1745]? MgII emission line flux;
1e-17erg/s/cm2
63- 68 F6.2 10-20W/m2 e_FMgII [4.9/153]? Uncertainty in FMgII
70- 76 F7.2 10-20W/m2 FCIV [7.6/4074]? CIV emission line flux;
1e-17erg/s/cm2
78- 84 F7.2 10-20W/m2 e_FCIV [5.7/1416]? Uncertainty in FCIV
86- 90 F5.2 [10-7W] logLBLR [40.44/45.45] Log Broad-line region
luminosity; erg/s
92- 95 F4.2 [10-7W] e_logLBLR [0/0.5] Uncertainty in logLBLR
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Note (1): Classification as follows:
B = BL Lac (249 sources)
F = FSRQ (29 sources)
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 24-Apr-2024