Publication:
Catalog of Long-term Transient Sources in the First 10 yr of Fermi-LAT Data

Issued Date

2021-09-01

Resource Type

Article

ISSN

00670049

DOI

10.3847/1538-4365/ac072a

Other identifier(s)

2-s2.0-85115816543

Rights

Mahidol University

Rights Holder(s)

SCOPUS

Bibliographic Citation

Astrophysical Journal, Supplement Series. Vol.256, No.1 (2021)

Suggested Citation

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 Catalog of Long-term Transient Sources in the First 10 yr of Fermi-LAT Data. Astrophysical Journal, Supplement Series. Vol.256, No.1 (2021). doi:10.3847/1538-4365/ac072a Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/76850

Research Projects

Organizational Units

Authors

Journal Issue

Thesis

Title

Catalog of Long-term Transient Sources in the First 10 yr of Fermi-LAT Data

Author(s)

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

Other Contributor(s)

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

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.

Keyword(s)

Earth and Planetary Sciences
 Physics and Astronomy

Availability

URI

https://repository.li.mahidol.ac.th/handle/20.500.14594/76850

Collections

Scopus 2021