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Title: The Second Catalog of Flaring Gamma-Ray Sources from the Fermi All-sky Variability Analysis
Authors: S. Abdollahi
M. Ackermann
M. Ajello
A. Albert
L. Baldini
J. Ballet
G. Barbiellini
D. Bastieri
J. Becerra Gonzalez
R. Bellazzini
E. Bissaldi
R. D. Blandford
E. D. Bloom
R. Bonino
E. Bottacini
J. Bregeon
P. Bruel
R. Buehler
S. Buson
R. A. Cameron
M. Caragiulo
P. A. Caraveo
E. Cavazzuti
C. Cecchi
A. Chekhtman
C. C. Cheung
G. Chiaro
S. Ciprini
J. Conrad
D. Costantin
F. Costanza
S. Cutini
F. D'Ammando
F. De Palma
A. Desai
R. Desiante
S. W. Digel
N. Di Lalla
M. Di Mauro
L. Di Venere
B. Donaggio
P. S. Drell
C. Favuzzi
S. J. Fegan
E. C. Ferrara
W. B. Focke
A. Franckowiak
Y. Fukazawa
S. Funk
P. Fusco
F. Gargano
D. Gasparrini
N. Giglietto
M. Giomi
F. Giordano
M. Giroletti
T. Glanzman
D. Green
I. A. Grenier
J. E. Grove
L. Guillemot
S. Guiriec
E. Hays
D. Horan
T. Jogler
G. Jóhannesson
A. S. Johnson
D. Kocevski
M. Kuss
G. La Mura
S. Larsson
L. Latronico
J. Li
F. Longo
F. Loparco
M. N. Lovellette
P. Lubrano
Hiroshima University
Deutsche Elektronen-Synchrotron
Clemson University
Los Alamos National Laboratory
Università di Pisa
Universite Paris 7- Denis Diderot
Istituto Nazionale di Fisica Nucleare, Roma
Università degli Studi di Trieste
Istituto Nazionale Di Fisica Nucleare, Sezione di Padova
Università degli Studi di Padova
NASA Goddard Space Flight Center
University of Maryland
Istituto Nazionale Di Fisica Nucleare, Sezione di Pisa
Kavli Institute for Particle Astrophysics and Cosmology
Università degli Studi di Torino
Laboratoire Univers et Particules de Montpellier
Laboratoire Leprince-Ringuet
Università degli Studi di Bari
INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Milan
Agenzia Spaziale Italiana
Università degli Studi di Perugia
George Mason University, Fairfax Campus
Naval Research Laboratory
Stockholms universitet
Oskar Klein Centre for Cosmoparticle Physics
INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Bologna
Alma Mater Studiorum Università di Bologna
Università degli Studi di Napoli Federico II
Università degli Studi di Udine
Erlangen Centre for Astroparticle Physics
Universite d'Orleans
Institut National des Sciences de l'Univers
Friedrich-Alexander-Universität Erlangen-Nürnberg
University Science Institute Reykjavik
The Royal Institute of Technology (KTH)
Universitat Autònoma de Barcelona
Mahidol University
Max Planck Institut für Physik (Werner-Heisenberg-Institut)
Osservatorio Astronomico di Trieste
Keywords: Earth and Planetary Sciences
Issue Date: 1-Sep-2017
Citation: Astrophysical Journal. Vol.846, No.1 (2017)
Abstract: © 2017. The American Astronomical Society. All rights reserved. We present the second catalog of flaring gamma-ray sources (2FAV) detected with the Fermi All-sky Variability Analysis (FAVA), a tool that blindly searches for transients over the entire sky observed by the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope. With respect to the first FAVA catalog, this catalog benefits from a larger data set, the latest LAT data release (Pass 8), as well as from an improved analysis that includes likelihood techniques for a more precise localization of the transients. Applying this analysis to the first 7.4 years of Fermi observations, and in two separate energy bands 0.1-0.8 GeV and 0.8-300 GeV, a total of 4547 flares were detected with significance greater than 6σ(before trials), on the timescale of one week. Through spatial clustering of these flares, 518 variable gamma-ray sources were identified. Based on positional coincidence, likely counterparts have been found for 441 sources, mostly among the blazar class of active galactic nuclei. For 77 2FAV sources, no likely gamma-ray counterpart has been found. For each source in the catalog, we provide the time, location, and spectrum of each flaring episode. Studying the spectra of the flares, we observe a harder-when-brighter behavior for flares associated with blazars, with the exception of BL Lac flares detected in the low-energy band. The photon indexes of the flares are never significantly smaller than 1.5. For a leptonic model, and under the assumption of isotropy, this limit suggests that the spectrum of freshly accelerated electrons is never harder than P ∼ 2.
ISSN: 15384357
Appears in Collections:Scopus 2016-2017

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