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

TitleCatalog of Long-term Transient Sources in the First 10 yr of Fermi-LAT Data
Authors
Issue Date2021
PublisherAmerican Astronomical Society.
Citation
The Astrophysical Journal Supplement Series, 2021, v. 256 n. 1, p. article no. 13 How to Cite?
AbstractWe 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.
Persistent Identifierhttp://hdl.handle.net/10722/304747
ISSN
2020 Impact Factor: 8.136
2020 SCImago Journal Rankings: 3.546
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorBaldini, L-
dc.contributor.authorBallet, J-
dc.contributor.authorBastieri, D-
dc.contributor.authorBecerra Gonzalez, J-
dc.contributor.authorBellazzini, R-
dc.contributor.authorBerretta, A-
dc.contributor.authorBissaldi, E-
dc.contributor.authorBlandford, RD-
dc.contributor.authorBloom, ED-
dc.contributor.authorBonino, R-
dc.contributor.authorBottacini, E-
dc.contributor.authorPaneque, D-
dc.contributor.authorPei, Z-
dc.contributor.authorPersic, M-
dc.contributor.authorPesce-Rollins, M-
dc.contributor.authorPetrosian, V-
dc.contributor.authorPoon, H-
dc.contributor.authorPorter, TA-
dc.contributor.authorPrincipe, G-
dc.contributor.authorRacusin, JL-
dc.contributor.authorRainò, S-
dc.contributor.authorSaz Parkinson, PM-
dc.contributor.authorRando, R-
dc.contributor.authorRani, B-
dc.contributor.authorRazzano, M-
dc.contributor.authorRazzaque, S-
dc.contributor.authorReimer, A-
dc.contributor.authorReimer, O-
dc.contributor.authorScotton, L-
dc.contributor.authorSerini, D-
dc.contributor.authorSgrò, C-
dc.contributor.authorSiskind, EJ-
dc.contributor.authorSpandre, G-
dc.contributor.authorSpinelli, P-
dc.contributor.authorSuson, DJ-
dc.contributor.authorTajima, H-
dc.contributor.authorTak, D-
dc.contributor.authorBruel, P-
dc.contributor.authorTorres, DF-
dc.contributor.authorTosti, G-
dc.contributor.authorTroja, E-
dc.contributor.authorWood, K-
dc.contributor.authorYassine, M-
dc.contributor.authorZaharijas, G-
dc.contributor.authorBuson, S-
dc.contributor.authorCameron, RA-
dc.contributor.authorCaraveo, PA-
dc.contributor.authorCavazzuti, E-
dc.contributor.authorChen, S-
dc.contributor.authorChiaro, G-
dc.contributor.authorCiangottini, D-
dc.contributor.authorCibario, N-
dc.contributor.authorCiprini, S-
dc.contributor.authorCristarella Orestano, P-
dc.contributor.authorCrnogorcevic, M-
dc.contributor.authorCutini, S-
dc.contributor.authorD’Ammando, F-
dc.contributor.authorde la Torre Luque, P-
dc.contributor.authorde Palma, F-
dc.contributor.authorDigel, SW-
dc.contributor.authorDi Lalla, N-
dc.contributor.authorDirirsa, F-
dc.contributor.authorDi Venere, L-
dc.contributor.authorDomínguez, A-
dc.contributor.authorFiori, A-
dc.contributor.authorFleischhack, H-
dc.contributor.authorFranckowiak, A-
dc.contributor.authorFukazawa, Y-
dc.contributor.authorFunk, S-
dc.contributor.authorFusco, P-
dc.contributor.authorGargano, F-
dc.contributor.authorGasparrini, D-
dc.contributor.authorGermani, S-
dc.contributor.authorGiglietto, N-
dc.contributor.authorGiordano, F-
dc.contributor.authorGiroletti, M-
dc.contributor.authorGreen, D-
dc.contributor.authorGrenier, IA-
dc.contributor.authorGriffin, S-
dc.contributor.authorGuiriec, S-
dc.contributor.authorGustafsson, M-
dc.contributor.authorHewitt, JW-
dc.contributor.authorHoran, D-
dc.contributor.authorImazawa, R-
dc.contributor.authorJóhannesson, G-
dc.contributor.authorKerr, M-
dc.contributor.authorKocevski, D-
dc.contributor.authorKuss, M-
dc.contributor.authorLarsson, S-
dc.contributor.authorLatronico, L-
dc.contributor.authorLi, J-
dc.contributor.authorLiodakis, I-
dc.contributor.authorLongo, F-
dc.contributor.authorLoparco, F-
dc.contributor.authorLovellette, MN-
dc.contributor.authorLubrano, P-
dc.contributor.authorMaldera, S-
dc.contributor.authorManfreda, A-
dc.contributor.authorMartí-Devesa, G-
dc.contributor.authorMatake, H-
dc.contributor.authorMazziotta, MN-
dc.contributor.authorMereu, I-
dc.contributor.authorMeyer, M-
dc.contributor.authorMirabal, N-
dc.contributor.authorMitthumsiri, W-
dc.contributor.authorMizuno, T-
dc.contributor.authorMonzani, ME-
dc.contributor.authorMorselli, A-
dc.contributor.authorMoskalenko, IV-
dc.contributor.authorNagasawa, S-
dc.contributor.authorNegro, M-
dc.contributor.authorOjha, R-
dc.contributor.authorOrienti, M-
dc.contributor.authorOrlando, E-
dc.contributor.authorPalatiello, M-
dc.contributor.authorPaliya, V-
dc.date.accessioned2021-10-05T02:34:36Z-
dc.date.available2021-10-05T02:34:36Z-
dc.date.issued2021-
dc.identifier.citationThe Astrophysical Journal Supplement Series, 2021, v. 256 n. 1, p. article no. 13-
dc.identifier.issn0067-0049-
dc.identifier.urihttp://hdl.handle.net/10722/304747-
dc.description.abstractWe 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.-
dc.languageeng-
dc.publisherAmerican Astronomical Society.-
dc.relation.ispartofThe Astrophysical Journal Supplement Series-
dc.rightsThe Astrophysical Journal Supplement Series. Copyright © IOP Publishing.-
dc.rightsThis is an author-created, un-copyedited version of an article published in [insert name of journal]. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at http://dx.doi.org/[insert DOI].-
dc.titleCatalog of Long-term Transient Sources in the First 10 yr of Fermi-LAT Data-
dc.typeArticle-
dc.identifier.emailSaz Parkinson, PM: pablosp@hku.hk-
dc.identifier.authoritySaz Parkinson, PM=rp01803-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.3847/1538-4365/ac072a-
dc.identifier.scopuseid_2-s2.0-85115816543-
dc.identifier.hkuros325825-
dc.identifier.volume256-
dc.identifier.issue1-
dc.identifier.spagearticle no. 13-
dc.identifier.epagearticle no. 13-
dc.identifier.isiWOS:000692874900001-
dc.publisher.placeUnited States-

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