J/ApJ/936/146 SED, optical & gamma-ray parameters for 656 blazars (Xiao+, 2022)
An Extensive Study of Blazar Broad Emission Line: Changing-look Blazars and the
Baldwin Effect.
Xiao H., Fan J., Ouyang Z., Hu L., Chen G., Fu L., Zhang S.
<Astrophys. J., 936, 146 (2022)>
=2022ApJ...936..146X 2022ApJ...936..146X
ADC_Keywords: Gamma rays; Optical; QSOs; BL Lac objects; Equivalent widths;
Redshifts
Keywords: Blazars ; Flat-spectrum radio quasars
Abstract:
It is known that the blazar jet emissions are dominated by nonthermal
radiation, while the accretion disk jets are normally dominated by
thermal emission. In this work, ourOptical aim is to study the connection
between the two types of emission by investigating the correlation
between the blazar emission-line intensity property, which embodies
the nature of an accretion disk, and the γ-ray flux property,
which is the representative of jet emission. We compiled a sample of
656 blazars with available emission-line equivalent widths (EWs), the
GeV γ-ray flux, and the spectral energy distribution (SED)
information from the literature. In this work, we found 55 previous
blazar candidates of uncertain types (BCUs) that are now identified as
flat-spectrum radio quasars (FSRQs), and found 52 "changing-look"
blazars based on their EWs, 45 of which are newly confirmed. These
changing-look blazars have a larger accretion ratio (M/MEdd) than BL
Lacertae (BL Lac) objects. In addition, we suggest that the lower
synchrotron peak blazars (LSPs) could be the source of changing-look
blazars because 90.7% of the changing-look blazars in this work are
confirmed as LSPs. An anticorrelation between EW and continuum
intensity, the so-called global "Baldwin effect" (BEff), has been
confirmed. We suggest that the steeper global BEff observed for the
blazar than for radio-quiet active galactic nuclei (RQ-AGNs) is caused
by the inverse Compton scattering of broad-emission-line photons. This
interpretation is further supported by the positive correlation
between the emission-line EW and intrinsic inverse Compton luminosity.
Description:
We collect blazar emission-line profiles from
Paliya+, 2021, J/ApJS/253/46, in which 674 Fermi sources are included.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 114 656 Optical, γ-ray, and SED parameters of 656
4LAC blazars
--------------------------------------------------------------------------------
See also:
VIII/5 : Bright Extragalactic Radio Sources (1Jy) (Kuehr+, 1981)
V/154 : Sloan Digital Sky Surveys (SDSS), Release 16 (DR16) (Ahumada+, 2020)
J/ApJ/613/682 : AGN central masses & broad-line region sizes (Peterson+, 2004)
J/A+A/445/441 : SED of BL Lacertae objects (Nieppola+, 2006)
J/ApJ/716/30 : SED of Fermi bright blazars (Abdo+, 2010)
J/ApJS/189/15 : FeII emission in a sample of AGN spectra (Kovacevic+, 2010)
J/ApJS/194/45 : QSO properties from SDSS-DR7 (Shen+, 2011)
J/ApJ/748/49 : Optical 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/ApJ/788/48 : X-ray through NIR photometry of NGC 2617 (Shappee+, 2014)
J/ApJ/804/7 : SaMOSA: optical spectroscopy of 7 Fermi blazars (Isler+, 2015)
J/ApJS/226/20 : X-ray, opt. & radio SEDs of Fermi blazars (Fan+, 2016)
J/ApJS/234/12 : MOJAVE XV. VLBA 15GHz obs of AGN jets 1996-2016 (Lister+, 2018)
J/ApJS/240/6 : LAMOST Quasar Survey: Data Releases 4 and 5 (Yao+, 2019)
J/ApJS/247/33 : The Fermi LAT fourth source catalog (4FGL) (Abdollahi+, 2020)
J/ApJ/892/105 : 4th catalog of Fermi LAT-detected AGNs (4LAC) (Ajello+, 2020)
J/ApJS/253/10 : 12yrs of R-band photometry of the quasar 3C 454.3 (Fan+, 2021)
J/ApJ/913/146 : The blazar B21420+32 opt & gamma LCs & opt. sp. (Mishra+, 2021)
J/ApJS/253/46 : Optical spectroscopy of Fermi blazars (Paliya+, 2021)
J/AJ/161/196 : Optical overview of blazars with LAMOST. I (Pena-herazo+, 2021)
J/ApJ/925/97 : Fermi-LAT-detected blazars fundamental parameters (Pei+, 2022)
J/ApJ/925/40 : Fermi blazar jet properties (Xiao+, 2022)
J/ApJS/263/24 : The 4LAC-DR3 catalog (Ajello+, 2022)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- --- [4FGL]
6- 18 A13 --- 4FGL The 4FGL identifier (JHHMM.m+DDMM)
20- 24 F5.3 --- z [0.027/4.314] Spectroscopic redshift (1)
26- 32 F7.2 0.1nm EW-Ha [4.72/2376]? Hα equivalent width (1)
34- 40 F7.2 0.1nm e_EW-Ha [1/1376]? Uncertainty in EW-Ha (1)
42- 48 F7.2 0.1nm EW-Hb [0/1045]? Hβ equivalent width (1)
50- 55 F6.2 0.1nm e_EW-Hb [0/145]? Uncertainty in EW-Hb (1)
57- 63 F7.2 0.1nm EW-MgII [0/1154]? Mg II equivalent width (1)
65- 70 F6.2 0.1nm e_EW-MgII [0.2/242]? Uncertainty in EW-MgII (1)
72- 78 F7.2 0.1nm EW-CIV [0/1963]? C IV equivalent width (1)
80- 85 F6.2 0.1nm e_EW-CIV [0.06/268]? Uncertainty in EW-CIV (1)
87- 91 F5.2 [10-7W] logBLR [41.76/46.42] Log broad line region
luminosity; erg/s
93- 98 F6.2 [mW/m2] logIC [-12.63/-9.32]? Log inverse Compton peak
flux; erg/cm2/s
100-107 E8.2 ph/cm2/s Flux [6.26e-11/8.69e-08] Integral 1-100GeV photon
flux (2)
109-112 F4.2 --- alpha [1.95/3.04] Photon index (2)
114 A1 --- Class 4LAC DR2 (see Ajello+ 2022, J/ApJS/263/24)
classification (3)
--------------------------------------------------------------------------------
Note (1): Obtained from Paliya+, 2021, J/ApJS/253/46
Note (2): Obtained from Ajello+, 2020, J/ApJ/892/105
Note (3): Classes as follows:
B = BL Lacertae object (51 occurrences)
F = flat spectrum radio quasar (FSRQ; 550 occurrences)
U = blazar candidates of uncertain type (BCU; 55 occurrences).
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 28-Jun-2024