Fermi large area telescope observations of two gamma-ray emission components from the quiescent sun
| Title: | Fermi large area telescope observations of two gamma-ray emission components from the quiescent sun |
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| Authors: | Abdo AA; Ackermann M; Ajello M; Baldini L; Ballet J; Barbiellini G; Bastieri D; Bechtol K; Bellazzini R; Berenji B; Bonamente E; Borgland AW; Bouvier A; Bregeon J; Brez A; Brigida M; Bruel P; Buehler R; Buson S; Caliandro GA; Cameron RA; Caraveo PA; Casandjian JM; Cecchi C; Charles E; Chekhtman A; Chiang J; Ciprini S; Claus R; Cohen Tanugi J; Conrad J; Cutini S; de Angelis A; de Palma F; Dermer CD; Digel SW; Silva EDE; Drell PS; Dubois R; Fegan SJ; Focke WB; Fortin P; Frailis M; Funk S; Fusco P; Gargano F; Gasparrini D; Gehrels N; Germani S; Giordano F; Giroletti M; Glanzman T; Godfrey G; Grenier IA; Grillo L; Guiriec S; Hadasch D; Hays E; Hughes RE; Iafrate G; Johannesson G; Johnson AS; Johnson TJ; Kamae T; Katagiri H; Kataoka J; Knodlseder J; Kuss M; Lande J; Latronico L; Lee SH; Lionetto AM; Longo F; Loparco F; Lott B; Lovellette MN; Lubrano P; Makeev A; Mazziotta MN; McEnery JE; Mehault J; Michelson PF; Mitthumsiri W; Mizuno T; Moiseev AA; Monte C; Monzani ME; Morselli A; Moskalenko IV; Murgia S; Nakamori T; Naumann Godo M; Nolan PL; Norris JP; Nuss E; Ohsugi T; Okumura A; Omodei N; Orlando E; Ormes JF; Ozaki M; Paneque D; Pelassa V; Pesce Rollins M; Pierbattista M; Piron F; Porter TA; Raino S; Rando R; Razzano M; Reimer A; Reimer O; Reposeur T; Ritz S; Sadrozinski HFW; Schalk TL; Sgro C; Share GH; Siskind EJ; Smith PD; Spandre G; Spinelli P; Strickman MS; Strong AW; Takahashi H; Tanaka T; Thayer JG; Thayer JB; Thompson DJ; Tibaldo L; Torres DF; Tosti G; Tramacere A; Troja E; Uchiyama Y; Usher TL; Vandenbroucke J; Vasileiou V; Vianello G; Vilchez N; Vitale V; Vladimirov AE; Waite AP; Wang P; Winer BL; Wood KS; Yang Z; Ziegler M.; FAVUZZI, Cecilia; GIGLIETTO, Nicola |
| Contributors: | Abdo, Aa; Ackermann, M; Ajello, M; Baldini, L; Ballet, J; Barbiellini, G; Bastieri, D; Bechtol, K; Bellazzini, R; Berenji, B; Bonamente, E; Borgland, Aw; Bouvier, A; Bregeon, J; Brez, A; Brigida, M; Bruel, P; Buehler, R; Buson, S; Caliandro, Ga; Cameron, Ra; Caraveo, Pa; Casandjian, Jm; Cecchi, C; Charles, E; Chekhtman, A; Chiang, J; Ciprini, S; Claus, R; Cohen Tanugi, J; Conrad, J; Cutini, S; de Angelis, A; de Palma, F; Dermer, Cd; Digel, Sw; Silva, Ede; Drell, P; Dubois, R; Favuzzi, Cecilia; Fegan, Sj; Focke, Wb; Fortin, P; Frailis, M; Funk, S; Fusco, P; Gargano, F; Gasparrini, D; Gehrels, N; Germani, S; Giglietto, Nicola; Giordano, F; Giroletti, M; Glanzman, T; Godfrey, G; Grenier, Ia; Grillo, L; Guiriec, S; Hadasch, D; Hays, E; Hughes, Re; Iafrate, G; Johannesson, G; Johnson, A; Johnson, Tj; Kamae, T; Katagiri, H; Kataoka, J; Knodlseder, J; Kuss, M; Lande, J; Latronico, L; Lee, Sh; Lionetto, Am; Longo, F; Loparco, F; Lott, B; Lovellette, Mn; Lubrano, P; Makeev, A; Mazziotta, Mn; Mcenery, Je; Mehault, J; Michelson, Pf; Mitthumsiri, W; Mizuno, T; Moiseev, Aa; Monte, C; Monzani, Me; Morselli, A; Moskalenko, Iv; Murgia, S; Nakamori, T; Naumann Godo, M; Nolan, Pl; Norris, Jp; Nuss, E; Ohsugi, T; Okumura, A; Omodei, N |
| Publication Year: | 2011 |
| Collection: | Politecnico di Bari: Iris POLIBA (Catalogo dei prodotti della Ricerca) |
| Subject Terms: | Astroparticle physic; cosmic ray; gamma rays: general; Sun: atmosphere; Sun: heliosphere; Sun: X-rays; gamma rays |
| Description: | We report the detection of high-energy γ-rays from the quiescent Sun with the Large Area Telescope on board the Fermi Gamma-Ray Space Telescope (Fermi) during the first 18 months of the mission. These observations correspond to the recent period of low solar activity when the emission induced by cosmic rays (CRs) is brightest. For the first time, the high statistical significance of the observations allows clear separation of the two components: the point-like emission from the solar disk due to CR cascades in the solar atmosphere and extended emission from the inverse Compton (IC) scattering of CR electrons on solar photons in the heliosphere. The observed integral flux (≥100MeV) from the solar disk is (4.6 ± 0.2[statistical error] +1.0 - 0.8[systematic error]) × 10 -7cm-2s-1, which is 7 times higher than predicted by the "nominal" model of Seckel etal. In contrast, the observed integral flux (≥100MeV) of the extended emission from a region of 20° radius centered on the Sun, but excluding the disk itself, (6.8 ± 0.7[stat.]+0.5 - 0.4[syst.]) × 10 -7cm-2s-1, along with the observed spectrum and the angular profile, is in good agreement with the theoretical predictions for the IC emission. |
| Document Type: | article in journal/newspaper |
| Language: | English |
| Relation: | info:eu-repo/semantics/altIdentifier/wos/WOS:000291386500044; volume:734; issue:2; journal:THE ASTROPHYSICAL JOURNAL; https://hdl.handle.net/11589/52180 |
| DOI: | 10.1088/0004-637X/734/2/116 |
| Availability: | https://hdl.handle.net/11589/52180; https://doi.org/10.1088/0004-637X/734/2/116 |
| Rights: | info:eu-repo/semantics/openAccess ; license:Tutti i diritti riservati |
| Accession Number: | edsbas.501CD701 |
| Database: | BASE |