دورية أكاديمية
Fermi Large Area Telescope observations of the Crab pulsar and Nebula
| العنوان: | Fermi Large Area Telescope observations of the Crab pulsar and Nebula |
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| المؤلفون: | Abdo, A.A., Ackermann, Markus, Ajello, Marco, B. Atwood, W., Axelsson, Magnus, Baldini, Luca, Ballet, Jean, Barbiellini, Guido, G. Baring, M., Bastieri, D., Bechtol, K., Bellazzini, R., Berenji, B., D. Blandford, R., D. Bloom, E., Bonamente, E., W. Borgland, A., Bregeon, J., Brez, A., Brigida, M., Bruel, Pascal, H. Burnett, T., A. Caliandro, G., A. Cameron, R., Camilo, F., Caraveo, P. A., M. Casandjian, J., Cecchi, C., Celik, O., Chekhtman, A., C. Cheung, C., Chiang, J., Ciprini, S., Claus, R., Cognard, Ismaël, Cohen-Tanugi, J., R. Cominsky, L., Conrad, J., D. Dermer, C., de Angelis, A., de Luca, A., de Palma, F., W. Digel, S., Do Couto E Silva, E., S. Drell, P., Dubois, R., Dumora, D., Espinoza, C., Farnier, C., Favuzzi, C., J. Fegan, S., C. Ferrara, E., B. Focke, W., Frailis, M., C. C. Freire, P., Fukazawa, Y., Funk P. Fusco, S., Gargano, F., Gasparrini, D., Gehrels, N., Germani, S., Giavitto, G., Giebels, B., Giglietto, N., Giordano, F., Glanzman, T., Godfrey, G., A. Grenier, I., Grondin, M.-H., E. Grove, J., Guillemot, L., Guiriec, S., Hanabata, Y., K. Harding, A., Hayashida, M., Hays, E., E. Hughes, R., Johannesson, G., S. Johnson, A., P. Johnson, R., J. Johnson, T., N. Johnson, W., Johnston, S., Kamae, T., Katagiri, H., Kataoka, J., Kawai, N., Kerr, M., Knödlseder, Jürgen, L. Kocian, M., Kramer, M., Kuehn, F., Kuss, M., Lande, J., Latronico, L., Lee, S.-H., Lemoine-Goumard, M., Longo, F., Loparco, F., Lott, B., N. Lovellette, M., Lubrano, P., G. Lyne, A., Makeev, A., Marelli, M., N. Mazziotta, M., E. Mcenery, J., Meurer, C., F. Michelson, P., Mitthumsiri, W., Mizuno, T., A. Moiseev, A., Monte, C., E. Monzani, M., Moretti, E., Morselli, A., V. Moskalenko, I., Murgia, S., Nakamori, T., L. Nolan, P., P. Norris, J., Noutsos, A., Nuss, E., Ohsugi, T., Omodei, N., Orlando, E., F. Ormes, J., Ozaki, M., Paneque, D., H. Panetta, J., Parent, D., Pelassa, V., Pepe, M., Pesce-Rollins, M., Pierbattista, M., Piron, F., Porter, T.A., Raino, S., Rando, R., S. Ray, P., Razzano, M., Reimer, A., Reimer, O., Reposeur, T., Ritz, S., S. Rochester, L., Y. Rodriguez, A., W. Romani, R., Roth, M., Ryde, F., F.-W. Sadrozinski, H., Sanchez, D., Sander, A., M. Saz Parkinson, P., D. Scargle, J., Sgro, C., J. Siskind, E., Smith, David Stanley, D. Smith, P., Spandre, G., Spinelli, P., W. Stappers, B., S. Strickman, M., J. Suson, D., Tajima, H., Takahashi, H., Tanaka, T., B. Thayer, J., G. Thayer, J., Theureau, G., J. Thompson, D., E. Thorsett, S., Tibaldo, L., F. Torres, D., Tosti, G., Tramacere, A., Uchiyama, Y., L. Usher, T., van Etten, A., Vasileiou, V., Vilchez, N., Vitale, V., P. Waite, A., Wallace, E., Wang, P., Watters, K., Weltevrede, P., L. Winer, B., S. Wood, K., Ylinen, T., Ziegler, M. |
| المساهمون: | Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique et chimie de l'environnement (LPCE), Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS), Unité Scientifique de la Station de Nançay (USN), Observatoire des Sciences de l'Univers en région Centre (OSUC), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris Sciences et Lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Théorique et Astroparticules (LPTA), Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre d'étude spatiale des rayonnements (CESR), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) |
| المصدر: | ISSN: 0004-637X. |
| بيانات النشر: | HAL CCSD American Astronomical Society |
| سنة النشر: | 2010 |
| المجموعة: | Université Toulouse III - Paul Sabatier: HAL-UPS |
| مصطلحات موضوعية: | pulsars: individual (Crab), supernova remnants, gamma rays: observations, ISM: individual (Crab Nebula), [SDU.ASTR.HE]Sciences of the Universe [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], [PHYS.ASTR.HE]Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE] |
| الوصف: | We report on γ -ray observations of the Crab Pulsar and Nebula using 8 months of survey data with the Fermi Large Area Telescope (LAT). The high quality light curve obtained using the ephemeris provided by the Nan¸cay and Jodrell Bank radio telescopes shows two main peaks stable in phase with energy. The first γ -ray peak leads the radio main pulse by (281 ± 12 ± 21) μs, giving new constraints on the production site of non-thermal emission in pulsar magnetospheres. The first uncertainty is due to γ -ray statistics, and the second arises from the rotation parameters. The improved sensitivity and the unprecedented statistics afforded by the LAT enable precise measurement of the Crab Pulsar spectral parameters: cut-off energy at Ec = (5.8 ± 0.5 ± 1.2) GeV, spectral index of Γ = (1.97 ± 0.02 ± 0.06) and integral photon flux above 100 MeV of (2.09 ± 0.03 ± 0.18) × 10−6 cm−2 s−1. The first errors represent the statistical error on the fit parameters, while the second ones are the systematic uncertainties. Pulsed γ -ray photons are observed up to ∼20 GeV which precludes emission near the stellar surface, below altitudes of around 4–5 stellar radii in phase intervals encompassing the two main peaks. A detailed phase-resolved spectral analysis is also performed: the hardest emission from the Crab Pulsar comes from the bridge region between the two γ -ray peaks while the softest comes from the falling edge of the second peak. The spectrum of the nebula in the energy range 100 MeV–300 GeV is well described by the sum of two power laws of indices Γsync = (3.99 ± 0.12 ± 0.08) and ΓIC = (1.64 ± 0.05 ± 0.07), corresponding to the falling edge of the synchrotron and the rising edge of the inverse Compton (IC) components, respectively. This latter, which links up naturally with the spectral data points of Cherenkov experiments, is well reproduced via IC scattering from standard magnetohydrodynamic nebula models, and does not require any additional radiation mechanism. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| العلاقة: | in2p3-00453756; https://hal.in2p3.fr/in2p3-00453756Test; https://hal.in2p3.fr/in2p3-00453756/documentTest; https://hal.in2p3.fr/in2p3-00453756/file/Abdo_2010_ApJ_708_1254.pdfTest |
| DOI: | 10.1088/0004-637X/708/2/1254 |
| الإتاحة: | https://doi.org/10.1088/0004-637X/708/2/1254Test https://hal.in2p3.fr/in2p3-00453756Test https://hal.in2p3.fr/in2p3-00453756/documentTest https://hal.in2p3.fr/in2p3-00453756/file/Abdo_2010_ApJ_708_1254.pdfTest |
| حقوق: | info:eu-repo/semantics/OpenAccess |
| رقم الانضمام: | edsbas.ECDCDEB9 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1088/0004-637X/708/2/1254 |
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