J/ApJS/257/37 Multiwavelength data for blazars 3C 279 & 3C 454.3 (Paliya+, 2021)
On the origin of gamma-ray flares from bright Fermi blazars.
Paliya V.S., Bottcher M., Gurwell M., Stalin C.S.
<Astrophys. J. Suppl. Ser., 257, 37 (2021)>
=2021ApJS..257...37P 2021ApJS..257...37P
ADC_Keywords: Active gal. nuclei; Gamma rays; X-ray sources; Ultraviolet;
Optical; Infrared; Radio sources
Keywords: Relativistic jets ; Blazars ; Gamma-ray astronomy ;
Radiative processes
Abstract:
The origin of γ-ray flares observed from blazars is one of the
major mysteries in jet physics. We have attempted to address this
problem following a novel spectral energy distribution (SED) fitting
technique that explored the flaring patterns identified in the
broadband SEDs of two γ-ray bright blazars, 3C 279 (z=0.54) and
3C 454.3 (z=0.86), using near-simultaneous radio-to-γ-ray
observations. For both sources, the γ-ray flux strongly
correlates with the separation of the SED peaks and the Compton
dominance. We propose that spectral hardening of the radiating
electron population and/or enhancement of the Doppler factor can
naturally explain these observations. In both cases, magnetic
reconnection may play a pivotal role in powering the luminous
γ-ray flares.
Description:
We analyzed 0.1-300GeV data taken with Fermi-LAT between 2008 August 4
and 2021 May 5 (MJD54683-59339) to generate 3 day binned γ-ray
light curves and spectra.
We extracted the 0.3-10keV spectra from the observations taken with
the Neil Gehrels Swift X-ray Telescope in the time interval
MJD54683-59339.
Data from the Swift Ultraviolet and Optical telescope (V, B, U, W1,
M2, and W2 filters), Steward Observatory (V and R bands) and Small and
Medium Aperture Research Telescope System (SMARTS-B, V, R, J and K
filters) were used to extract the source magnitudes in the NIR,
optical, and UV bands.
We considered the multifrequency radio fluxes made available by the
University of Michigan Radio Astronomy Observatory (UMRAO, 4.8, 8, and
14.5GHz), the Submillimeter Array (230 and 350GHz), and the Atacama
Large Millimeter/submillimeter Array (ALMA, 35 to 950GHz). The radio
fluxes published in Angelakis+ 2019, J/A+A/626/A60 and
Larionov+ 2020MNRAS.492.3829L 2020MNRAS.492.3829L were also used.
Objects:
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RA (ICRS) DE Designation(s)
----------------------------------------------------------
12 56 11.17 -05 47 21.5 3C 279 = CGRaBS J1256-0547
22 53 57.75 +16 08 53.6 3C 454.3 = CGRaBS J2253+1608
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 35 3767 *The multiwavelength data for 3C 279
table2.dat 35 4090 *The multiwavelength data for 3C 454.3
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Note on table1.dat and table2.dat: The Fermi-LAT light curve bin in which there
is at least one observation taken in the radio, IR-UV, X- and γ-rays.
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See also:
VIII/76 : Leiden/Argentine/Bonn (LAB) Survey of Galactic HI (Kalberla+ 2005)
J/A+A/333/231 : O-M stars model atmospheres (Bessell+ 1998)
J/MNRAS/397/1177 : Swift-XRT observations of GRBs (Evans+, 2009)
J/A+A/626/A60 : F-GAMMA 2.64-43GHz radio data; 2007-2015 (Angelakis+, 2019)
J/A+A/627/A140 : FSRQ PKS 0346-27 light curves (Angioni+, 2019)
J/MNRAS/485/1188 : The ALMA Calibrator Catalogue (Bonato+, 2019)
J/ApJS/247/33 : Fermi LAT fourth source catalog (4FGL) (Abdollahi+, 2020)
J/ApJ/892/105 : 4th cat. of Fermi LAT-detected AGNs (4LAC) (Ajello+, 2020)
J/ApJS/253/46 : Optical spectroscopy of Fermi blazars (Paliya+, 2021)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 7 F7.1 d TStart [54685.7/59233.7] Modified Juliand Date
of light curve bin start
9- 15 F7.1 d TStop [54688.7/59236.7] Modified Juliand Date
of light curve bin stop
17- 22 F6.3 [Hz] logf [9.17/25.6] log observed frequency
24- 29 F6.3 [10-7W] logL [44.33/48.55] Log observed luminosity; erg/s
31- 35 F5.3 [10-7W] e_logL [0/0.7] Uncertainty in logL
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Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 F7.1 d TStart [54682.7/57574.7] Modified Juliand Date of
light curve bin start
9- 15 F7.1 d TStop [54685.6/57577.7] Modified Juliand Date of
light curve bin stop
17- 22 F6.3 [Hz] logf [9.42/25] log observed frequency
24- 29 F6.3 [10-7W] logL [45/49.55] Log observed luminosity; erg/s
31- 35 F5.3 [10-7W] e_logL [0/0.51] Uncertainty in logL
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 23-Feb-2022