1. Catalog of Long-term Transient Sources in the First 10 yr of Fermi-LAT Data
- Author
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Fermi-Lat Collaboration, T., Baldini, L., Ballet, J., Bastieri, D., Becerra Gonzalez, J., Bellazzini, R., Berretta, A., Bissaldi, E., Blandford, R. D., Bloom, E. D., Bonino, R., Bottacini, E., Bruel, P., Buson, S., Cameron, R. A., Caraveo, P. A., Cavazzuti, E., Chen, S., Chiaro, G., Ciangottini, D., Cibario, N., Ciprini, S., Cristarella Orestano, P., Crnogorcevic, M., Cutini, S., D'Ammando, F., De La Torre Luque, P., De Palma, F., Digel, S. W., Di Lalla, N., Dirirsa, F., Di Venere, L., Dominguez, A., Fiori, A., Fleischhack, H., Franckowiak, A., Fukazawa, Y., Funk, S., Fusco, P., Gargano, F., Gasparrini, D., Germani, S., Giglietto, N., Giordano, F., Giroletti, M., Green, D., Grenier, I. A., Griffin, S., Guiriec, S., Gustafsson, M., Hewitt, J. W., Horan, D., Imazawa, R., Johannesson, G., Kerr, M., Kocevski, D., Kuss, M., Larsson, S., Latronico, L., Li, J., Liodakis, I., Longo, F., Loparco, F., Lovellette, M. N., Lubrano, P., Maldera, S., Manfreda, A., Marti-Devesa, G., Matake, H., Mazziotta, M. N., Mereu, I., Meyer, M., Mirabal, N., Mitthumsiri, W., Mizuno, T., Monzani, M. E., Morselli, A., Moskalenko, I. V., Nagasawa, S., Negro, M., Ojha, R., Orienti, M., Orlando, E., Palatiello, M., Paliya, V., Paneque, D., Pei, Z., Persic, M., Pesce-Rollins, M., Petrosian, V., Poon, H., Porter, T. A., Principe, G., Racusin, J. L., Rain, S., Rando, R., Rani, B., Razzano, M., Razzaque, S., Reimer, A., Reimer, O., Saz Parkinson, P. M., Scotton, L., Serini, D., Sgr, C., Siskind, E. J., Spandre, G., Spinelli, P., Suson, D. J., Tajima, H., Tak, D., Torres, D. F., Tosti, G., Troja, E., Wood, K., Yassine, M., Zaharijas, G., Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Laboratoire Univers et Particules de Montpellier (LUPM), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Fermi-LAT, Astrophysique Interprétation Modélisation (AIM (UMR_7158 / UMR_E_9005 / UM_112)), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Montpellier 2 - Sciences et Techniques (UM2), Baldini, L, Ballet, J, Bastieri, D, Gonzalez, Jb, Bellazzini, R, Berretta, A, Bissaldi, E, Blandford, Rd, Bloom, Ed, Bonino, R, Bottacini, E, Bruel, P, Buson, S, Cameron, Ra, Caraveo, Pa, Cavazzuti, E, Chen, S, Chiaro, G, Ciangottini, D, Cibario, N, Ciprini, S, Orestano, Pc, Crnogorcevic, M, Cutini, S, D'Ammando, F, Luque, Pd, de Palma, F, Digel, Sw, Di Lalla, N, Dirirsa, F, Di Venere, L, Dominguez, A, Fiori, A, Fleischhack, H, Franckowiak, A, Fukazawa, Y, Funk, S, Fusco, P, Gargano, F, Gasparrini, D, Germani, S, Giglietto, N, Giordano, F, Giroletti, M, Green, D, Grenier, Ia, Griffin, S, Guiriec, S, Gustafsson, M, Hewitt, Jw, Horan, D, Imazawa, R, Johannesson, G, Kerr, M, Kocevski, D, Kuss, M, Larsson, S, Latronico, L, Li, J, Liodakis, I, Longo, F, Loparco, F, Lovellette, Mn, Lubrano, P, Maldera, S, Manfreda, A, Marti-Devesa, G, Matake, H, Mazziotta, Mn, Mereu, I, Meyer, M, Mirabal, N, Mitthumsiri, W, Mizuno, T, Monzani, Me, Morselli, A, Moskalenko, Iv, Nagasawa, S, Negro, M, Ojha, R, Orienti, M, Orlando, E, Palatiello, M, Paliya, V, Paneque, D, Pei, Z, Persic, M, Pesce-Rollins, M, Petrosian, V, Poon, H, Porter, Ta, Principe, G, Racusin, Jl, Raino, S, Rando, R, Rani, B, Razzano, M, Razzaque, S, Reimer, A, Reimer, O, Parkinson, Pm, Scotton, L, Serini, D, Sgro, C, Siskind, Ej, Spandre, G, Spinelli, P, Suson, Dj, Tajima, H, Tak, D, Torres, Df, Tosti, G, Troja, E, Wood, K, Yassine, M, Zaharijas, G, Fermi-Lat Collaboration, T., Baldini, L., Ballet, J., Bastieri, D., Becerra Gonzalez, J., Bellazzini, R., Berretta, A., Bissaldi, E., Blandford, R. D., Bloom, E. D., Bonino, R., Bottacini, E., Bruel, P., Buson, S., Cameron, R. A., Caraveo, P. A., Cavazzuti, E., Chen, S., Chiaro, G., Ciangottini, D., Cibario, N., Ciprini, S., Cristarella Orestano, P., Crnogorcevic, M., Cutini, S., D'Ammando, F., De La Torre Luque, P., De Palma, F., Digel, S. W., Di Lalla, N., Dirirsa, F., Di Venere, L., Dominguez, A., Fiori, A., Fleischhack, H., Franckowiak, A., Fukazawa, Y., Funk, S., Fusco, P., Gargano, F., Gasparrini, D., Germani, S., Giglietto, N., Giordano, F., Giroletti, M., Green, D., Grenier, I. A., Griffin, S., Guiriec, S., Gustafsson, M., Hewitt, J. W., Horan, D., Imazawa, R., Johannesson, G., Kerr, M., Kocevski, D., Kuss, M., Larsson, S., Latronico, L., Li, J., Liodakis, I., Longo, F., Loparco, F., Lovellette, M. N., Lubrano, P., Maldera, S., Manfreda, A., Marti-Devesa, G., Matake, H., Mazziotta, M. N., Mereu, I., Meyer, M., Mirabal, N., Mitthumsiri, W., Mizuno, T., Monzani, M. E., Morselli, A., Moskalenko, I. V., Nagasawa, S., Negro, M., Ojha, R., Orienti, M., Orlando, E., Palatiello, M., Paliya, V., Paneque, D., Pei, Z., Persic, M., Pesce-Rollins, M., Petrosian, V., Poon, H., Porter, T. A., Principe, G., Racusin, J. L., Rain, S., Rando, R., Rani, B., Razzano, M., Razzaque, S., Reimer, A., Reimer, O., Saz Parkinson, P. M., Scotton, L., Serini, D., Sgr, C., Siskind, E. J., Spandre, G., Spinelli, P., Suson, D. J., Tajima, H., Tak, D., Torres, D. F., Tosti, G., Troja, E., Wood, K., Yassine, M., and Zaharijas, G.
- Subjects
Gamma ray transients ,gamma-ray astronomy ,Active galactic nucleus ,Solar gamma-ray emission ,010504 meteorology & atmospheric sciences ,Radio galaxy ,media_common.quotation_subject ,Gamma-ray telescopes ,Astrophysics::High Energy Astrophysical Phenomena ,FOS: Physical sciences ,Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,01 natural sciences ,Gamma-ray transient sources ,0103 physical sciences ,Blazar ,010303 astronomy & astrophysics ,Quasars ,Astrophysics::Galaxy Astrophysics ,0105 earth and related environmental sciences ,media_common ,Physics ,High Energy Astrophysical Phenomena (astro-ph.HE) ,Spectral index ,Active galactic nuclei ,Gamma-ray sources ,Astronomy and Astrophysics ,Quasar ,Gamma ray transient ,Space and Planetary Science ,Sky ,Solar flares ,Gamma-ray bursts ,Catalogs ,Astrophysics - High Energy Astrophysical Phenomena ,Gamma-rays ,[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] ,High energy astrophysics ,Blazars ,BL Lac object ,Fermi Gamma-ray Space Telescope - Abstract
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 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 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 (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 $\gamma$-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., Comment: 41 pages, 17 figures, 7 tables; Accepted by ApJS on 24 May 2021; Contact Authors: I. Mereu, S. Cutini, E. Cavazzuti, G. Tosti
- Published
- 2021
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