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

被引：11

作者：

Baldini, L. ^{[1
,2
]}

Ballet, J. ^{[3
]}

Bastieri, D. ^{[4
,5
]}

Becerra Gonzalez, J. ^{[6
]}

Bellazzini, R. ^{[2
]}

Berretta, A. ^{[7
,8
]}

Bissaldi, E. ^{[9
,10
]}

Blandford, R. D. ^{[11
,12
]}

Bloom, E. D. ^{[11
,12
]}

Bonino, R. ^{[13
,14
]}

Bottacini, E. ^{[11
,12
,15
]}

Bruel, P. ^{[16
]}

Buson, S. ^{[17
]}

Cameron, R. A. ^{[11
,12
]}

Caraveo, P. A. ^{[18
]}

Cavazzuti, E. ^{[19
]}

Chen, S. ^{[4
,15
]}

Chiaro, G. ^{[18
]}

Ciangottini, D. ^{[8
]}

Cibario, N. ^{[13
,14
]}

Ciprini, S. ^{[20
,21
]}

Cristarella Orestano, P. ^{[7
,8
]}

Crnogorcevic, M. ^{[22
]}

Cutini, S. ^{[8
]}

D'Ammando, F. ^{[23
]}

de la Torre Luque, P. ^{[9
]}

de Palma, F. ^{[24
,25
]}

Digel, S. W. ^{[11
,12
]}

Di Lalla, N. ^{[11
,12
]}

Dirirsa, F. ^{[26
]}

Di Venere, L. ^{[9
,10
]}

Dominguez, A. ^{[27
]}

Fiori, A. ^{[28
]}

Fleischhack, H. ^{[29
,30
,31
]}

Franckowiak, A. ^{[32
]}

Fukazawa, Y. ^{[33
]}

Funk, S. ^{[34
]}

Fusco, P. ^{[9
,10
]}

Gargano, F. ^{[10
]}

Gasparrini, D. ^{[20
,21
]}

Germani, S. ^{[7
,8
]}

Giglietto, N. ^{[9
,10
]}

Giordano, F. ^{[9
,10
]}

Giroletti, M. ^{[23
]}

Green, D. ^{[35
]}

Grenier, I. A. ^{[3
]}

Griffin, S. ^{[30
]}

Guiriec, S. ^{[30
,36
]}

Gustafsson, M. ^{[37
]}

Hewitt, J. W. ^{[38
]}

机构：

[1] Univ Pisa, I-56127 Pisa, Italy

[2] Ist Nazl Fis Nucl, Sez Pisa, I-56127 Pisa, Italy

[3] Univ Paris, Univ Paris Saclay, CNRS, AIM,CEA, F-91191 Gif Sur Yvette, France

[4] Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy

[5] Univ Padua, Dipartimento Fis & Astron G Galilei, I-35131 Padua, Italy

[6] Inst Astrofis Canarias, Observ Teide, C Via Lactea S-N, E-38205 Tenerife, Spain

[7] Univ Perugia, Dipartimento Fis, I-06123 Perugia, Italy

[8] Ist Nazl Fis Nucl, Sez Perugia, I-06123 Perugia, Italy

[9] Univ & Politecn Bari, Dipartimento Fis M Merlin, Via Amendola 173, I-70126 Bari, Italy

[10] Ist Nazl Fis Nucl, Sez Bari, I-70126 Bari, Italy

[11] Stanford Univ, WW Hansen Expt Phys Lab, Kavli Inst Particle Astrophys & Cosmol, Dept Phys, Stanford, CA 94305 USA

[12] Stanford Univ, SLAC Natl Accelerator Lab, Stanford, CA 94305 USA

[13] Ist Nazl Fis Nucl, Sez Torino, I-10125 Turin, Italy

[14] Univ Torino, Dipartimento Fis, I-10125 Turin, Italy

[15] Univ Padua, Dept Phys & Astron, Vicolo Osservatorio 3, I-35122 Padua, Italy

[16] Ecole Polytech, Lab Leprince Ringuet, CNRS, IN2P3, F-91128 Palaiseau, France

[17] Univ Wurzburg, Inst Theoret Phys & Astrophys, D-97074 Wurzburg, Germany

[18] INAF Ist Astrofis Spaziale & Fis Cosm Milano, Via E Bassini 15, I-20133 Milan, Italy

[19] Via Politecn Snc, Italian Space Agcy, I-00133 Rome, Italy

[20] Ist Nazl Fis Nucl, Sez Roma Tor Vergata, I-00133 Rome, Italy

[21] Via Politecn Snc, Space Sci Data Ctr, Agenzia Spaziale Italiana, I-00133 Rome, Italy

[22] Univ Maryland, Dept Astron, College Pk, MD 20742 USA

[23] INAF Ist Radioastron, I-40129 Bologna, Italy

[24] Univ Salento, Dipartimento Matemat & Fis E Giorgi, Lecce, Italy

[25] Ist Nazl Fis Nucl, Sez Lecce, I-73100 Lecce, Italy

[26] Univ Savoie, Lab Annecy le Vieux Phys Particules, CNRS, IN2P3, F-74941 Annecy Le Vieux, France

[27] Univ Complutense Madrid, Grp Altas Energias, E-28040 Madrid, Spain

[28] Univ Pisa, Dipartimento Fis Enrico Fermi, I-56127 Pisa, Italy

[29] Catholic Univ Amer, Washington, DC 20064 USA

[30] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[31] Ctr Res & Explorat Space Sci & Technol CRESST, Greenbelt, MD 20771 USA

[32] Ruhr Univ Bochum, Astron Inst AIRUB, Fac Phys & Astron, D-44780 Bochum, Germany

[33] Hiroshima Univ, Dept Phys Sci, Higashihiroshima, Hiroshima 7398526, Japan

[34] Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany

[35] Max Planck Inst Phys & Astrophys, D-80805 Munich, Germany

[36] George Washington Univ, Dept Phys, 725 21st St NW, Washington, DC 20052 USA

[37] Georg August Univ Gottingen, Inst Theoret Phys, Fac Phys, Friedrich Hund Pl 1, D-37077 Gottingen, Germany

[38] Univ North Florida, Dept Phys, 1 UNF Dr, Jacksonville, FL 32224 USA

[39] Univ Iceland, Sci Inst, IS-107 Reykjavik, Iceland

[40] Royal Inst Technol, NORDITA, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden

[41] Stockholm Univ, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden

[42] Naval Res Lab, Div Space Sci, Washington, DC 20375 USA

[43] NASA, Marshall Space Flight Ctr, Huntsville, AL 35812 USA

[44] KTH Royal Inst Technol, Dept Phys, AlbaNova, SE-10691 Stockholm, Sweden

[45] AlbaNova, Oskar Klein Ctr Cosmoparticle Phys, SE-10691 Stockholm, Sweden

[46] Dalarna Univ, Sch Educ Hlth & Social Studies, Nat Sci, SE-79188 Falun, Sweden

[47] Deutsch Elektronen Synchrotron DESY, D-15738 Zeuthen, Germany

[48] Univ Turku, Finnish Ctr Astron ESO FINCA, FI-21500 Piikiio, Finland

[49] Ist Nazl Fis Nucl, Sez Trieste, I-34127 Trieste, Italy

[50] Univ Trieste, Dipartimento Fis, I-34127 Trieste, Italy

来源：

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES | 2021年 / 256卷 / 01期

基金：

欧洲研究理事会;

关键词：

LARGE-AREA TELESCOPE; ACTIVE GALACTIC NUCLEI; GAMMA-RAY SOURCES; SPECTROSCOPIC DATA; RADIO GALAXIES; DATA RELEASE; 2ND CATALOG; VARIABILITY; EVOLUTION; DISCOVERY;

D O I：

10.3847/1538-4365/ac072a

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the first Fermi Large Area Telescope (LAT) catalog of long-term gamma-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 4 sigma in at least one monthly bin were listed in the final catalog. The 1FLT catalog contains 142 transient gamma-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 gamma-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 gamma-ray emitters is less efficient when the data are integrated over year-long intervals.

引用

页数：27

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