Observations of the Large Magellanic Cloud with Fermi
| Title: | Observations of the Large Magellanic Cloud with Fermi |
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| Authors: | Abdo AA; Ackermann M; Ajello M; Atwood WB; Baldini L; Ballet J; Barbiellini G; Bastieri D; Baughman BM; Bechtol K; Bellazzini R; Berenji B; Blandford RD; Bloom ED; Bonamente E; Borgland AW; Bregeon J; Brez A; Brigida M; Bruel P; Burnett TH; Buson S; Caliandro GA; Cameron RA; Caraveo PA; Casandjian JM; Cecchi C; Celik O; Chekhtman A; Cheung CC; Chiang J; Ciprini S; Claus R; Cohen Tanugi J; Cominsky LR; Conrad J; Cutini S; Dermer CD; de Angelis A; de Palma F; Digel SW; Silva EDE; Drell PS; Dubois R; Dumora D; Farnier C; FAVUZZI, Cecilia; Fegan SJ; Focke WB; Fortin P; Frailis M; Fukazawa Y; Fusco P; Gargano F; Gasparrini D; Gehrels N; Germani S; Giavitto G; Giebels B; GIGLIETTO, Nicola; Giordano F; Glanzman T; Godfrey G; Gotthelf EV; Grenier IA; Grondin MH; Grove JE; Guillemot L; Guiriec S; Hanabata Y; Harding AK; Hayashida M; Hays E; Horan D; Hughes RE; Jackson MS; Jean P; Johannesson G; Johnson AS; Johnson RP; Johnson TJ; Johnson WN; Kamae T; Katagiri H; Kataoka J; Kawai N; Kerr M; Knodlseder J; Kocian ML; Kuss M; Lande J; Latronico L; Lemoine Goumard M; Longo F; Loparco F; Lott B; Lovellette MN; Lubrano P; Madejski GM; Makeev A; Marshall F; Martin P; Mazziotta MN; McConville W; McEnery JE; Meurer C; Michelson PF; Mitthumsiri W; Mizuno T; Moiseev AA; Monte C; Monzani ME; Morselli A; Moskalenko IV; Murgia S; Nolan PL; Norris JP; Nuss E; Ohsugi T; Omodei N; Orlando E; Ormes JF; Paneque D; Parent D; Pelassa V; Pepe M; Pesce Rollins M; Piron F; Porter TA; Raino S; Rando M; Razzano M; Reimer A; Reimer O; Reposeur T; Ritz S; Rodriguez AY; Romani RW; Roth M; Ryde F; Sadrozinski HFW; Sanchez D; Sander A; Parkinson PMS; Scargle JD; Sellerholm A; Sgro C; Siskind EJ; Smith DA; Smith PD; Spandre G; Spinelli P; Starck JL; Strickman MS; Strong AW; Suson DJ; Tajima H; Takahashi H; Tanaka T; Thayer JB; Thayer JG; Thompson DJ; Tibaldo L; Torres DF; Tosti G; Tramacere A; Uchiyama Y; Usher TL; Vasileiou V; Venter C; Vilchez N; Vitale V; Waite AP; Wang P; Weltevrede P; Winer BL; Wood KS; Ylinen T; Ziegler M. |
| Contributors: | Abdo, Aa; Ackermann, M; Ajello, M; Atwood, Wb; Baldini, L; Ballet, J; Barbiellini, G; Bastieri, D; Baughman, Bm; Bechtol, K; Bellazzini, R; Berenji, B; Blandford, Rd; Bloom, Ed; Bonamente, E; Borgland, Aw; Bregeon, J; Brez, A; Brigida, M; Bruel, P; Burnett, Th; Buson, S; Caliandro, Ga; Cameron, Ra; Caraveo, Pa; Casandjian, Jm; Cecchi, C; Celik, O; Chekhtman, A; Cheung, Cc; Chiang, J; Ciprini, S; Claus, R; Cohen Tanugi, J; Cominsky, Lr; Conrad, J; Cutini, S; Dermer, Cd; de Angelis, A; de Palma, F; Digel, Sw; Silva, Ede; Drell, P; Dubois, R; Dumora, D; Farnier, C; Favuzzi, Cecilia; Fegan, Sj; Focke, Wb; Fortin, P; Frailis, M; Fukazawa, Y; Fusco, P; Gargano, F; Gasparrini, D; Gehrels, N; Germani, S; Giavitto, G; Giebels, B; Giglietto, Nicola; Giordano, F; Glanzman, T; Godfrey, G; Gotthelf, Ev; Grenier, Ia; Grondin, Mh; Grove, Je; Guillemot, L; Guiriec, S; Hanabata, Y; Harding, Ak; Hayashida, M; Hays, E; Horan, D; Hughes, Re; Jackson, M; Jean, P; Johannesson, G; Johnson, A; Johnson, Rp; Johnson, Tj; Johnson, Wn; Kamae, T; Katagiri, H; Kataoka, J; Kawai, N; Kerr, M; Knodlseder, J; Kocian, Ml; Kuss, M; Lande, J; Latronico, L; Lemoine Goumard, M; Longo, F; Loparco, F; Lott, B; Lovellette, Mn; Lubrano, P; Madejski, Gm; Makeev, A |
| Publication Year: | 2010 |
| Collection: | Politecnico di Bari: Iris POLIBA (Catalogo dei prodotti della Ricerca) |
| Subject Terms: | Acceleration of particle; cosmic ray; Magellanic Cloud; gamma rays: galaxies |
| Description: | Context. The Large Magellanic Cloud (LMC) is to date the only normal external galaxy that has been detected in high-energy gamma rays. High-energy gamma rays trace particle acceleration processes and gamma-ray observations allow the nature and sites of acceleration to be studied. Aims. We characterise the distribution and sources of cosmic rays in the LMC from analysis of gamma-ray observations. Methods. We analyse 11 months of continuous sky-survey observations obtained with the Large Area Telescope aboard the Fermi Gamma-Ray Space Telescope and compare it to tracers of the interstellar medium and models of the gamma-ray sources in the LMC. Results. The LMC is detected at 33 sigma significance. The integrated >100 MeV photon flux of the LMC amounts to (2.6 +/- 0.2) x 10(-7) ph cm(-2) s(-1) which corresponds to an energy flux of (1.6 +/- 0.1) x 10(-10) erg cm(-2) s(-1), with additional systematic uncertainties of less than or similar to 16%. The analysis reveals the massive star forming region 30 Doradus as a bright source of gamma-ray emission in the LMC in addition to fainter emission regions found in the northern part of the galaxy. The gamma-ray emission from the LMC shows very little correlation with gas density and is rather correlated to tracers of massive star forming regions. The close confinement of gamma-ray emission to star forming regions suggests a relatively short GeV cosmic-ray proton diffusion length. Conclusions. The close correlation between cosmic-ray density and massive star tracers supports the idea that cosmic rays are accelerated in massive star forming regions as a result of the large amounts of kinetic energy that are input by the stellar winds and supernova explosions of massive stars into the interstellar medium. |
| Document Type: | article in journal/newspaper |
| File Description: | STAMPA |
| Language: | English |
| Relation: | info:eu-repo/semantics/altIdentifier/wos/WOS:000276245500019; volume:512; numberofpages:15; journal:ASTRONOMY & ASTROPHYSICS; https://hdl.handle.net/11589/9885 |
| DOI: | 10.1051/0004-6361/200913474 |
| Availability: | https://hdl.handle.net/11589/9885; https://doi.org/10.1051/0004-6361/200913474 |
| Rights: | info:eu-repo/semantics/openAccess ; license:Tutti i diritti riservati |
| Accession Number: | edsbas.FEFEB0FC |
| Database: | BASE |