Catalog of Long-Term Transient Sources in the First 10 Years of Fermi-LAT Data
| dc.contributor.author | Baldini, L. | |
| dc.contributor.author | Ballet, J. | |
| dc.contributor.author | Bastieri, D. | |
| dc.contributor.author | Gonzalez, J. Becerra | |
| dc.contributor.author | Mirabal, N. | |
| dc.contributor.author | Negro, M. | |
| dc.contributor.author | et al. | |
| dc.date.accessioned | 2021-06-24T20:22:21Z | |
| dc.date.available | 2021-06-24T20:22:21Z | |
| dc.date.issued | 2021-05-31 | |
| dc.description | Authors: 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, 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. Rainò, R. Rando, B. Rani, M. Razzano, S. Razzaque, A. Reimer, O. Reimer, P. M. Saz Parkinson , L. Scotton, D. Serini, C. Sgrò, E. J. Siskind, G. Spandre, P. Spinelli, D. J. Suson, H. Tajima, D. Tak, D. F. Torres, G. Tosti, E. Troja, K. Wood, M. Yassine, G. Zaharijas | en_US |
| dc.description.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 time scale allows us to identify transient and variable sources that were not yet reported in other Fermi-LAT catalogs. The monthly datasets 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 (AGN): 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; 2 with AGN 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. | en_US |
| dc.description.sponsorship | The Fermi LAT Collaboration acknowledges generous ongoing support from a number of agencies and institutes that have supported both the development and the operation of the LAT as well as scientific data analysis. These include the National Aeronautics and Space Administration and the Department of Energy in the United States, the Commissariat à l’Energie Atomique and the Centre National de la Recherche Scientifique / Institut National de Physique Nucléaire et de Physique des Particules in France, the Agenzia Spaziale Italiana and the Istituto Nazionale di Fisica Nucleare in Italy, the Ministry of Education, Culture, Sports, Science and Technology (MEXT), High Energy Accelerator Research Organization (KEK) and Japan Aerospace Exploration Agency (JAXA) in Japan, and the K. A. Wallenberg Foundation, the Swedish Research Council and the Swedish National Space Board in Sweden. Additional support for science analysis during the operations phase is gratefully acknowledged from the Istituto Nazionale di Astrofisica in Italy and the Centre National d’Études Spatiales in France. This work performed in part under DOE Contract DE-AC02-76SF00515. Sara Buson acknowledges financial support by the European Research Council for the ERC Starting grant MessMapp, under contract no. 949555. G. Tosti acknowledges support from the Grant ASI/INAF n.2015-023-R.1. This work has been partially supported by the EOSC-hub EU project G.A 777536 and a special thank goes to Daniele Spiga (INFN Perugia) and Mirko Mariotti (University of Perugia) for the help with the computing infrastructure. Additional support for science analysis during the operations phase is gratefully acknowledged from Space Science Data Center Tools15, Open Universe portal and VOU-Blazar Tool9 (Giommi et al. 2020, Giommi et al. 2019). | en_US |
| dc.description.uri | https://arxiv.org/abs/2106.00100 | en_US |
| dc.format.extent | 41 pages | en_US |
| dc.genre | journal articles preprints | en_US |
| dc.identifier | doi:10.13016/m2v24l-mumc | |
| dc.identifier.citation | Baldini, L. et al; Catalog of Long-Term Transient Sources in the First 10 Years of Fermi-LAT Data; High Energy Astrophysical Phenomena, 31 May 2021; https://arxiv.org/abs/2106.00100 | en_US |
| dc.identifier.uri | http://hdl.handle.net/11603/21820 | |
| dc.language.iso | en_US | en_US |
| dc.relation.isAvailableAt | The University of Maryland, Baltimore County (UMBC) | |
| dc.relation.ispartof | UMBC Center for Space Sciences and Technology | |
| dc.relation.ispartof | UMBC Physics Department | |
| dc.relation.ispartof | UMBC Faculty Collection | |
| dc.rights | This item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author. | |
| dc.title | Catalog of Long-Term Transient Sources in the First 10 Years of Fermi-LAT Data | en_US |
| dc.type | Text | en_US |