Fermi-LAT observations of the Geminga pulsar
| Title: | Fermi-LAT observations of the Geminga pulsar |
|---|---|
| Authors: | Abdo AA; Ackermann M; Ajello M; Baldini L; Ballet J; Barbiellini G; Bastier D; Baughman BM; Bechtol K; Bellazzini R; Berenji B; Bignami GF; Blandford RD; Bloom ED; Bonamente E; Borgland AW; Bregeon J; Brez A; Brigida M; Brueli P; Burnett TH; Caliandro GA; Cameron RA; Caraveo PA; Casandjian JM; Cecchi C; Celik O; Charles E; Chekhtman A; Cheung CC; Chiang J; Ciprini S; Claus R; Cohen Tanugi J; Conrad J; Dermer CD; de Palma F; Dormody M; Silva EDE; Drell PS; Dubois R; Dumora D; Edmonds Y; Farnier C; FAVUZZI, Cecilia; Fegan SJ; Focke WB; Fortin P; Frailis M; Furazawa Y; Funk S; Fusco P; Gargano F; Gasparrini D; Gehrels N; Germani S; Giavitto G; GIGLIETTO, Nicola; Giordano F; Glanzman T; Godfrey G; Grenier IA; Grondin MH; Grove JE; Guillemot L; Guiriec S; Hadasch D; Hardino AK; Hays E; Hughes RE; Johannesson G; Johnson AS; Johnson TJ; Johnson WN; Kamae T; Katagiri H; Kataoka J; Kawai N; Kerr M; Knodlseder J; Kuss M; Lande J; Latronico L; Lemoine Goumard M; Longo F; Loparco F; Lott B; Lovellette MN; Lubrano P; Makeev A; Marelli M; Mazziotta MN; McEnery JE; Meurer C; Michelson PF; Mitthumsiri W; Mizuno T; Moiseev AA; Monte C; Monzani ME; Morselli A; Moskalenk IV; Murgia S; Nolan PL; Norris JP; Nuss E; Ohsugi T; Omodei N; Orlando E; Ormes JF; Ozaki M; Paneque D; Panetta JH; Parent D; Pelassa V; Pepe M; Pesce Rollins M; Piron F; Porter TA; Raino S; Rando R; Rayi PS; Razzano M; Reimer A; Reimer O; Reposeur T; Rochester LS; Rodriguez AY; Romani RW; Roth M; Ryde F; 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; Torres DF; Tosti G; Tramacere A; Usher TL; Van Etten A; Vasileiou V; Venter C; Vilchez N; Vitale V; Waite AP; Wang P; Watters K; Winer BL; Wood KS; Ylinen T; Ziegler M. |
| Contributors: | Abdo, Aa; Ackermann, M; Ajello, M; Baldini, L; Ballet, J; Barbiellini, G; Bastier, D; Baughman, Bm; Bechtol, K; Bellazzini, R; Berenji, B; Bignami, Gf; Blandford, Rd; Bloom, Ed; Bonamente, E; Borgland, Aw; Bregeon, J; Brez, A; Brigida, M; Brueli, P; Burnett, Th; Caliandro, Ga; Cameron, Ra; Caraveo, Pa; Casandjian, Jm; Cecchi, C; Celik, O; Charles, E; Chekhtman, A; Cheung, Cc; Chiang, J; Ciprini, S; Claus, R; Cohen Tanugi, J; Conrad, J; Dermer, Cd; de Palma, F; Dormody, M; Silva, Ede; Drell, P; Dubois, R; Dumora, D; Edmonds, Y; Farnier, C; Favuzzi, Cecilia; Fegan, Sj; Focke, Wb; Fortin, P; Frailis, M; Furazawa, Y; Funk, S; Fusco, P; Gargano, F; Gasparrini, D; Gehrels, N; Germani, S; Giavitto, G; Giglietto, Nicola; Giordano, F; Glanzman, T; Godfrey, G; Grenier, Ia; Grondin, Mh; Grove, Je; Guillemot, L; Guiriec, S; Hadasch, D; Hardino, Ak; Hays, E; Hughes, Re; Johannesson, G; Johnson, A; Johnson, Tj; Johnson, Wn; Kamae, T; Katagiri, H; Kataoka, J; Kawai, N; Kerr, M; Knodlseder, J; Kuss, M; Lande, J; Latronico, L; Lemoine Goumard, M; Longo, F; Loparco, F; Lott, B; Lovellette, Mn; Lubrano, P; Makeev, A; Marelli, M; Mazziotta, Mn; Mcenery, Je; Meurer, C; Michelson, Pf; Mitthumsiri, W; Mizuno, T; Moiseev, Aa; Monte, C; Monzani, Me |
| Publication Year: | 2010 |
| Collection: | Politecnico di Bari: Iris POLIBA (Catalogo dei prodotti della Ricerca) |
| Subject Terms: | Gamma rays: star; pulsars: general; pulsars: individual (PSR J0633+1746; Geminga) |
| Description: | We report on the Fermi-LAT observations of the Geminga pulsar, the second brightest non-variable GeV source in the gamma-ray sky and the first example of a radio-quiet gamma-ray pulsar. The observations cover one year, from the launch of the Fermi satellite through 2009 June 15. A data sample of over 60,000 photons enabled us to build a timing solution based solely on gamma-rays. Timing analysis shows two prominent peaks, separated by Delta phi = 0.497 +/- 0.004 in phase, which narrow with increasing energy. Pulsed gamma-rays are observed beyond 18 GeV, precluding emission below 2.7 stellar radii because of magnetic absorption. The phase-averaged spectrum was fitted with a power law with exponential cutoff of spectral index Gamma = (1.30 +/- 0.01 +/- 0.04), cutoff energy E(0) = (2.46 +/- 0.04 +/- 0.17) GeV, and an integral photon flux above 0.1 GeV of (4.14 +/- 0.02 +/- 0.32) x 10(-6) cm(-2) s(-1). The first uncertainties are statistical and the second ones are systematic. The phase-resolved spectroscopy shows a clear evolution of the spectral parameters, with the spectral index reaching a minimum value just before the leading peak and the cutoff energy having maxima around the peaks. The phase-resolved spectroscopy reveals that pulsar emission is present at all rotational phases. The spectral shape, broad pulse profile, and maximum photon energy favor the outer magnetospheric emission scenarios. |
| Document Type: | article in journal/newspaper |
| File Description: | STAMPA |
| Language: | English |
| Relation: | info:eu-repo/semantics/altIdentifier/wos/WOS:000281596000025; volume:720; issue:1; firstpage:272; lastpage:283; numberofpages:12; journal:THE ASTROPHYSICAL JOURNAL; https://hdl.handle.net/11589/1964 |
| DOI: | 10.1088/0004-637X/720/1/272 |
| Availability: | https://hdl.handle.net/11589/1964; https://doi.org/10.1088/0004-637X/720/1/272 |
| Rights: | info:eu-repo/semantics/openAccess ; license:Tutti i diritti riservati |
| Accession Number: | edsbas.D30CEF3C |
| Database: | BASE |