The dramatic increase in the number of known gamma-ray pulsars since the launch of the Fermi Gamma-ray Space Telescope (formerly GLAST) offers the first opportunity to study a sizable population of these high-energy objects. This catalog summarizes 46 high-confidence pulsed detections using the first six months of data taken by the Large Area Telescope (LAT), Fermi's main instrument. Sixteen previously unknown pulsars were discovered by searching for pulsed signals at the positions of bright gamma-ray sources seen with the LAT, or at the positions of objects suspected to be neutron stars based on observations at other wavelengths. The dimmest observed flux among these gamma-ray-selected pulsars is 6.0 × 10–8 ph cm–2 s–1 (for E>100 MeV). Pulsed gamma-ray emission was discovered from 24 known pulsars by using ephemerides (timing solutions) derived from monitoring radio pulsars. Eight of these new gamma-ray pulsars are millisecond pulsars. The dimmest observed flux among the radio-selected pulsars is 1.4 × 10–8 ph cm–2 s–1 (for E>100 MeV). The remaining six gamma-ray pulsars were known since the Compton Gamma Ray Observatory mission, or before. The limiting flux for pulse detection is non-uniform over the sky owing to different background levels, especially near the Galactic plane. The pulsed energy spectra can be described by a power law with an exponential cutoff, with cutoff energies in the range ~1-5 GeV. The rotational energy-loss rate (Ė) of these neutron stars spans five decades, from ~3 × 1033 erg s–1 to 5 × 1038 erg s–1, and the apparent efficiencies for conversion to gamma-ray emission range from ~0.1% to ~ unity, although distance uncertainties complicate efficiency estimates. The pulse shapes show substantial diversity, but roughly 75% of the gamma-ray pulse profiles have two peaks, separated by gsim0.2 of rotational phase. For most of the pulsars, gamma-ray emission appears to come mainly from the outer magnetosphere, while polar-cap emission remains plausible for a remaining few. Spatial associations imply that many of these pulsars power pulsar wind nebulae. Finally, these discoveries suggest that gamma-ray-selected young pulsars are born at a rate comparable to that of their radio-selected cousins and that the birthrate of all young gamma-ray-detected pulsars is a substantial fraction of the expected Galactic supernova rate.
|Autori interni:||BALDINI, LUCA|
|Autori:||Abdo AA; Ackermann M; Ajello M; Atwood WB; Axelsson M; Baldini L; Ballet J; Barbiellini G; Baring MG; 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; Camilo F; Caraveo PA; Casandjian JM; Cecchi C; Celik O; Charles E; Chekhtman A; Cheung CC; Chiang J; Ciprini S; Claus R; Cognard I; Cohen-Tanugi J; Cominsky LR; Conrad J; Corbet R; Cutini S; den Hartog PR; Dermer CD; de Angelis A; de Luca A; de Palma F; Digel SW; Dormody M; Silva EDE; Drell PS; Dubois R; Dumora D; Espinoza C; Farnier C; Favuzzi C; Fegan SJ; Ferrara EC; Focke WB; Fortin P; Frailis M; Freire PCC; Fukazawa Y; Funk S; Fusco P; Gargano F; Gasparrini D; Gehrels N; Germani S; Giavitto G; Giebels B; Giglietto N; Giommi P; Giordano F; Glanzman T; Godfrey G; Gotthelf EV; Grenier IA; Grondin MH; Grove JE; Guillemot L; Guiriec S; Gwon C; Hanabata Y; Harding AK; Hayashida M; Hays E; Hughes RE; Jackson MS; Johannesson G; Johnson AS; Johnson RP; Johnson TJ; Johnson WN; Johnston S; Kamae T; Kanbach G; Kaspi VM; Katagiri H; Kataoka J; Kawai N; Kerr M; Knoedlseder J; Kocian ML; Kramer M; Kuss M; Lande J; Latronico L; Lemoine-Goumard M; Livingstone M; Longo F; Loparco F; Lott B; Lovellette MN; Lubrano P; Lyne AG; Madejski GM; Makeev A; Manchester RN; Marelli M; Mazziotta MN; McConville W; McEnery JE; McGlynn S; Meurer C; Michelson PF; Mineo T; Mitthumsiri W; Mizuno T; Moiseev AA; Monte C; Monzani ME; Morselli A; Moskalenko IV; Murgia S; Nakamori T; Nolan PL; Norris JP; Noutsos A; 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; Ransom SM; Ray PS; Razzano M; Rea N; 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; Schalk TL; Sellerholm A; Sgro C; Siskind EJ; Smith DA; Smith PD; Spandre G; Spinelli P; Stappers BW; Starck JL; Striani E; Strickman MS; Strong AW; Suson DJ; Tajima H; Takahashi H; Takahashi T; Tanaka T; Thayer JB; Thayer JG; Theureau G; Thompson DJ; Thorsett SE; Tibaldo L; Tibolla O; Torres DF; Tosti G; Tramacere A; Uchiyama Y; Usher TL; Van Etten A; Vasileiou V; Venter C; Vilchez N; Vitale V; Waite AP; Wang P; Wang N; Watters K; Weltevrede P; Winer BL; Wood KS; Ylinen T; Ziegler M|
|Titolo:||THE FIRST FERMI LARGE AREA TELESCOPE CATALOG OF GAMMA-RAY PULSARS|
|Anno del prodotto:||2010|
|Digital Object Identifier (DOI):||10.1088/0067-0049/187/2/460|
|Appare nelle tipologie:||1.1 Articolo in rivista|