J/ApJ/913/120 4FGL blazars with Gaia DR2 data (Zeng+, 2021)
Cosmological evolution of Fermi Large Area Telescope gamma-ray blazars using
novel nonparametric methods.
Zeng H., Petrosian V., Yi T.
<Astrophys. J., 913, 120-120 (2021)>
=2021ApJ...913..120Z 2021ApJ...913..120Z (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei; Gamma rays; Photometry; Optical; Redshifts
Keywords: Gamma-rays; Blazars; Flat-spectrum radio quasars
Cosmic background radiation; Cosmological evolution
Luminosity function
Abstract:
Multiwavelength analyses of spectra of active galactic nuclei provide
useful information on the physical processes in the accretion disk and
jets of black holes. This, however, is limited to bright sources and
may not represent the population as a whole. Another approach is
through the investigation of the cosmological evolution of the
luminosity function (LF), which shows varied evolution (luminosity and
density) at different wavelengths. These differences and the
correlations between luminosities can shed light on the jet-accretion
disk connection. Most such studies use forward fitting parametric
methods that involve several functions and many parameters. We use
nonparametric, nonbinning methods developed by
Efron & Petrosian (1992ApJ...399..345E 1992ApJ...399..345E) and
Lynden-Bell (1971MNRAS.155...95L 1971MNRAS.155...95L), for obtaining unbiased description
of the evolution of the LF, from data truncated by observational
selection effects. We present an analysis of the evolution of
gamma-ray LF of blazars with a main focus on flat-spectrum radio
quasars. This requires analysis of both gamma-ray and optical data,
essential for redshift measurements, and a description of the joint
LF. We use a new approach that divides the sample into two subsamples,
each with its own flux limit. We use the Fermi Large Area Telescope
and GAIA observations, and present results on the gamma-ray LF and its
evolution, and determine the intrinsic correlation between the
gamma-ray and optical luminosities corrected for the well-known false
correlation induced by their similar redshift dependence and evolution
of the two luminosities. We also present a direct estimation of the
contribution of blazars to the spectrum of the extragalactic gamma-ray
background.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 123 1124 Sample for 1124 blazars
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
J/AJ/129/2542 : BL Lac from SDSS (Collinge+, 2005)
J/AJ/139/390 : Opt. selected BL Lac objects from SDSS-DR7 (Plotkin+, 2010)
J/ApJS/188/405 : Fermi-LAT first source catalog (1FGL) (Abdo+, 2010)
J/ApJ/780/73 : Redshifts of BL Lac objects from Fermi (Ajello+, 2014)
J/ApJ/799/86 : Isotropic gamma-ray emission 0.1-820GeV (Ackermann+, 2015)
J/MNRAS/464/1306 : LARGESS survey (Ching+, 2017)
J/ApJ/850/161 : Konus-Wind cat. of GRBs with redshifts. I. (Tsvetkova+, 2017)
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)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [4FGL]
6- 17 A12 --- 4FGL 4FGL name (JHHMM.m+DDMM)
19- 23 F5.3 --- z [0.01/3.8] Spectroscopic redshift from the 4LAC
(Ajello+, 2020, J/ApJ/892/105)
25- 33 E9.3 mW/m2 S25GeV [8.4e-13/1.2e-9] The 25GeV energy flux;
in erg/s/cm2 units
35- 39 F5.3 --- Gamma [1.5/3.2] Power-law spectral index in the
100MeV to 100GeV energy band
41- 44 A4 --- Class Classification (1)
46- 54 A9 --- --- [Gaia DR2:]
56- 74 I19 --- Gaia Gaia DR2 counterpart identifier
76- 81 F6.3 mag Gmag [12.8/21.5] Gaia DR2 G passband band magnitude
83- 88 F6.3 mag BPmag [12.9/21.3]?=0 Gaia DR2 Blue passband magnitude
90- 95 F6.3 mag RPmag [12.2/20.4]?=0 Gaia DR2 Red passband magnitude
97-102 F6.3 mJy fnu [0.009/24.7] Gaia DR2 G passband flux density
104-109 F6.3 mJy fnuBP [0.01/24]?=0 Gaia DR2 Blue passband flux density
111-116 F6.3 mJy fnuRP [0.01/32.1]?=0 Gaia DR2 Red passband flux density
118-123 F6.3 --- alpha [-0.8/4.1] Optical spectral index (2)
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Note (1): Classification as follows:
fsrq = Flat spectrum radio quasar candidates (529 occurrences)
bcu = Blazar candidate of uncertain type (93 occurrences)
BCU = Blazar candidate of uncertain type (1 occurrence)
bll = BL Lac candidates (480 occurrences)
BLL = BL Lac (21 occurrences)
Note (2): Optical spectral index from Equation (6):
αopt=0.4(GBP,AB-GRP,AB)/log(νBP/νRP)
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 25-Nov-2022