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Title: Catalog of Long-term Transient Sources in the First 10 yr of Fermi-LAT Data
Authors: The Fermi-Lat Collaboration
L. Baldini
J. Ballet
D. Bastieri
J. Becerra Gonzalez
R. Bellazzini
A. Berretta
E. Bissaldi
R. D. Blandford
E. D. Bloom
R. Bonino
E. Bottacini
P. Bruel
S. Buson
R. A. Cameron
P. A. Caraveo
E. Cavazzuti
S. Chen
G. Chiaro
D. Ciangottini
N. Cibario
S. Ciprini
P. Cristarella Orestano
M. Crnogorcevic
S. Cutini
F. D'Ammando
P. De La Torre Luque
F. De Palma
S. W. Digel
N. Di Lalla
F. Dirirsa
L. Di Venere
A. Domínguez
A. Fiori
H. Fleischhack
A. Franckowiak
Y. Fukazawa
S. Funk
P. Fusco
F. Gargano
D. Gasparrini
S. Germani
N. Giglietto
F. Giordano
M. Giroletti
D. Green
I. A. Grenier
S. Griffin
S. Guiriec
M. Gustafsson
J. W. Hewitt
D. Horan
R. Imazawa
G. Jóhannesson
M. Kerr
D. Kocevski
M. Kuss
S. Larsson
L. Latronico
J. Li
I. Liodakis
F. Longo
F. Loparco
M. N. Lovellette
P. Lubrano
S. Maldera
A. Manfreda
G. Martí-Devesa
H. Matake
M. N. Mazziotta
I. Mereu
M. Meyer
N. Mirabal
W. Mitthumsiri
T. Mizuno
M. E. Monzani
A. Morselli
I. V. Moskalenko
S. Nagasawa
M. Negro
R. Ojha
M. Orienti
E. Orlando
M. Palatiello
V. Paliya
D. Paneque
Z. Pei
M. Persic
M. Pesce-Rollins
V. Petrosian
H. Poon
T. A. Porter
G. Principe
J. L. Racusin
S. Rain
R. Rando
B. Rani
M. Razzano
S. Razzaque
A. Reimer
Oskar Klein Centre
Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
Istituto Nazionale di Fisica Nucleare, Sezione di Perugia
Istituto Nazionale di Fisica Nucleare, Sezione di Lecce
Istituto Nazionale di Fisica Nucleare, Sezione di Bari
Istituto Nazionale di Fisica Nucleare, Sezione di Roma Tor Vergata
Istituto Nazionale di Fisica Nucleare, Sezione di Torino
Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
Istituto Nazionale Di Fisica Nucleare, Sezione di Padova
Universite Paris-Saclay
Aryabhatta Research Institute of Observational Sciences
INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Milan
Korea Astronomy and Space Science Institute
Raunvísindastofnun Háskólans
Agenzia Spaziale Italiana
Georg-August-Universität Göttingen
Hiroshima University
Deutsches Elektronen-Synchrotron (DESY)
Osservatorio Astronomico di Trieste
Università di Pisa
Politecnico di Bari
Universidad Complutense de Madrid
Naval Research Laboratory
Università degli Studi di Udine
SLAC National Accelerator Laboratory
The University of Tokyo
University of Maryland, Baltimore County (UMBC)
Universita del Salento
Catholic University of America
American University
University of Maryland, College Park
Université Savoie Mont Blanc
Università degli Studi di Trieste
Högskolan Dalarna
École polytechnique
Mahidol University
Julius-Maximilians-Universität Würzburg
Istituto Di Radioastronomia, Bologna
Università degli Studi di Torino
NASA Marshall Space Flight Center
Instituto Astrofisico de Canarias
Universität Innsbruck
Max Planck Institute for Physics (Werner Heisenberg Institute)
Turun yliopisto
NASA Goddard Space Flight Center
Ruhr-Universitat Bochum
The George Washington University
Università degli Studi di Perugia
The Royal Institute of Technology (KTH)
Friedrich-Alexander-Universität Erlangen-Nürnberg
University of Johannesburg
Università degli Studi di Padova
University of North Florida
Keywords: Earth and Planetary Sciences;Physics and Astronomy
Issue Date: 1-Sep-2021
Citation: Astrophysical Journal, Supplement Series. Vol.256, No.1 (2021)
Abstract: We present the first Fermi Large Area Telescope (LAT) catalog of long-term γ-ray transient sources (1FLT). This comprises sources that were detected on monthly time intervals during the first decade of Fermi-LAT operations. The monthly timescale allows us to identify transient and variable sources that were not yet reported in other Fermi-LAT catalogs. The monthly data sets were analyzed using a wavelet-based source detection algorithm that provided the candidate new transient sources. The search was limited to the extragalactic regions of the sky to avoid the dominance of the Galactic diffuse emission at low Galactic latitudes. The transient candidates were then analyzed using the standard Fermi-LAT maximum likelihood analysis method. All sources detected with a statistical significance above 4σ in at least one monthly bin were listed in the final catalog. The 1FLT catalog contains 142 transient γ-ray sources that are not included in the 4FGL-DR2 catalog. Many of these sources (102) have been confidently associated with active galactic nuclei (AGNs): 24 are associated with flat-spectrum radio quasars, 1 with a BL Lac object, 70 with blazars of uncertain type, 3 with radio galaxies, 1 with a compact steep-spectrum radio source, 1 with a steep-spectrum radio quasar, and 2 with AGNs of other types. The remaining 40 sources have no candidate counterparts at other wavelengths. The median γ-ray spectral index of the 1FLT-AGN sources is softer than that reported in the latest Fermi-LAT AGN general catalog. This result is consistent with the hypothesis that detection of the softest γ-ray emitters is less efficient when the data are integrated over year-long intervals.
ISSN: 00670049
Appears in Collections:Scopus 2021

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