Publication:
The Second Catalog of Flaring Gamma-Ray Sources from the Fermi All-sky Variability Analysis

Issued Date

2017-09-01

Resource Type

Article

ISSN

15384357
0004637X

DOI

10.3847/1538-4357/aa8092

Other identifier(s)

2-s2.0-85029106472

Rights

Mahidol University

Rights Holder(s)

SCOPUS

Bibliographic Citation

Astrophysical Journal. Vol.846, No.1 (2017)

Suggested Citation

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 The Second Catalog of Flaring Gamma-Ray Sources from the Fermi All-sky Variability Analysis. Astrophysical Journal. Vol.846, No.1 (2017). doi:10.3847/1538-4357/aa8092 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/42489

Research Projects

Organizational Units

Authors

Journal Issue

Thesis

Title

The Second Catalog of Flaring Gamma-Ray Sources from the Fermi All-sky Variability Analysis

Author(s)

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

Other Contributor(s)

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

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.

Keyword(s)

Earth and Planetary Sciences

Availability

URI

https://repository.li.mahidol.ac.th/handle/20.500.14594/42489

Collections

Scopus 2016-2017