Fermi large area telescope observation of a gamma-ray source at the position of eta carinae
| Title: | Fermi large area telescope observation of a gamma-ray source at the position of eta carinae |
|---|---|
| Authors: | Abdo AA; Ackermann M; Ajello M; Allafort A; Baldini L; Ballet J; Barbiellini G; Bastieri D; Bechtol K; Bellazzini R; Berenji B; Blandford RD; Bonamente E; Borgland AW; Bouvier A; Brandt TJ; Bregeon J; Brez A; Brigida M; Bruel P; Buehler R; Burnett TH; Caliandro GA; Cameron RA; Caraveo PA; Carrigan S; Casandjian JM; Cecchi C; Celik O; Chaty S; Chekhtman A; Cheung CC; Chiang J; Ciprini S; Claus R; Cohen Tanugi J; Cominsky LR; Conrad J; Dermer CD; de Palma F; Digel SW; Silva EDE; Drell PS; Dubois R; Dumora D; FAVUZZI, Cecilia; Fegan SJ; Ferrara EC; Frailis M; Fukazawa Y; Fusco P; Gargano F; Gehrels N; Germani S; GIGLIETTO, Nicola; Giordano F; Godfrey G; Grenier IA; Grondin MH; Grove JE; Guillemot L; Guiriec S; Hadasch D; Hanabata Y; Harding AK; Hayashida M; Hays E; Hill AB; Horan D; Hughes RE; Itoh R; Jackson MS; Johannesson G; Johnson AS; Johnson WN; Kamae T; Katagiri H; Kataoka J; Kerr M; Knodlseder J; Kuss M; Lande J; Latronico L; Lee SH; Lemoine Goumard M; Livingstone M; Garde ML; Longo F; Loparco F; 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; Panetta JH; Parent D; Pelassa V; Pepe M; Pesce Rollins M; Piron F; Porter TA; Raino S; Rando R; Razzano M; Reimer A; Reimer O; Reposeur T; Rodriguez AY; Romani RW; Roth M; Sadrozinski HFW; Sander A; Parkinson PMS; Scargle JD; Sgro C; Siskind EJ; Smith DA; Smith PD; Spandre G; Spinelli P; Strickman MS; Suson DJ; Takahashi H; Takahashi T; Tanaka T; Thayer JB; Thayer JG; Thompson DJ; Tibaldo L; Tibolla O; Torres DF; Tosti G; Tramacere A; Uchiyama Y; Usher TL; Vandenbroucke J; Vasileiou V; Vilchez N; Vitale V; Waite AP; Wallace E; Wang P; Winer BL; Wood KS; Yang Z; Ylinen T; Ziegler M. |
| Contributors: | Abdo, Aa; Ackermann, M; Ajello, M; Allafort, A; Baldini, L; Ballet, J; Barbiellini, G; Bastieri, D; Bechtol, K; Bellazzini, R; Berenji, B; Blandford, Rd; Bonamente, E; Borgland, Aw; Bouvier, A; Brandt, Tj; Bregeon, J; Brez, A; Brigida, M; Bruel, P; Buehler, R; Burnett, Th; Caliandro, Ga; Cameron, Ra; Caraveo, Pa; Carrigan, S; Casandjian, Jm; Cecchi, C; Celik, O; Chaty, S; Chekhtman, A; Cheung, Cc; Chiang, J; Ciprini, S; Claus, R; Cohen Tanugi, J; Cominsky, Lr; Conrad, J; Dermer, Cd; de Palma, F; Digel, Sw; Silva, Ede; Drell, P; Dubois, R; Dumora, D; Favuzzi, Cecilia; Fegan, Sj; Ferrara, Ec; Frailis, M; Fukazawa, Y; Fusco, P; Gargano, F; Gehrels, N; Germani, S; Giglietto, Nicola; Giordano, F; Godfrey, G; Grenier, Ia; Grondin, Mh; Grove, Je; Guillemot, L; Guiriec, S; Hadasch, D; Hanabata, Y; Harding, Ak; Hayashida, M; Hays, E; Hill, Ab; Horan, D; Hughes, Re; Itoh, R; Jackson, M; Johannesson, G; Johnson, A; Johnson, Wn; Kamae, T; Katagiri, H; Kataoka, J; Kerr, M; Knodlseder, J; Kuss, M; Lande, J; Latronico, L; Lee, Sh; Lemoine Goumard, M; Livingstone, M; Garde, Ml; Longo, F; Loparco, F; Lovellette, Mn; Lubrano, P; Makeev, A; Mazziotta, Mn; Mcenery, Je; Mehault, J; Michelson, Pf; Mitthumsiri, W; Mizuno, T; Moiseev, Aa; Monte, C |
| Publication Year: | 2010 |
| Collection: | Politecnico di Bari: Iris POLIBA (Catalogo dei prodotti della Ricerca) |
| Subject Terms: | Binaries; Color figures; General-stars; Individual (Eta Carinae)-supergiants Online-only material |
| Description: | The Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope detected a gamma-ray source that is spatially consistent with the location of Eta Carinae. This source has been persistently bright since the beginning of the LAT survey observations (from 2008 August to 2009 July, the time interval considered here). The gamma-ray signal is detected significantly throughout the LAT energy band (i.e., up to similar to 100 GeV). The 0.1-100 GeV energy spectrum is well represented by a combination of a cutoff power-law model (10 GeV). The total flux (>100 MeV) is 3.7(-0.1)(+0.3) x 10(-7) photons s(-1) cm(-2), with additional systematic uncertainties of 10%, and consistent with the average flux measured by AGILE. The light curve obtained by Fermi is consistent with steady emission. Our observations do not confirm the presence of a gamma-ray flare in 2008 October, as reported by Tavani et al., although we cannot exclude that a flare lasting only a few hours escaped detection by the Fermi LAT. We also do not find any evidence for gamma-ray variability that correlates with the large X-ray variability of Eta Carinae observed during 2008 December and 2009 January. We are thus not able to establish an unambiguous identification of the LAT source with Eta Carinae. |
| Document Type: | article in journal/newspaper |
| File Description: | ELETTRONICO |
| Language: | English |
| Relation: | info:eu-repo/semantics/altIdentifier/wos/WOS:000284090100057; volume:723; issue:1; firstpage:649; lastpage:657; numberofpages:9; journal:THE ASTROPHYSICAL JOURNAL; https://hdl.handle.net/11589/1744 |
| DOI: | 10.1088/0004-637X/723/1/649 |
| Availability: | https://hdl.handle.net/11589/1744; https://doi.org/10.1088/0004-637X/723/1/649 |
| Rights: | info:eu-repo/semantics/openAccess ; license:Tutti i diritti riservati |
| Accession Number: | edsbas.EBA4A0B4 |
| Database: | BASE |