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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Fermi large area telescope observations of the crab pulsar and nebula
Astrophysical Journal, Volume 708, No. 2, Year 2010
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Description
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 Nançay 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. © 2010. The American Astronomical Society.
Authors & Co-Authors
Abdo, Aous A.
United States, Washington, D.c.
U.s. Naval Research Laboratory
United States, Washington, D.c.
National Academy of Sciences
Ackermann, Markus
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Ajello, Marco
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Atwood, W. B.
United States, Santa Cruz
University of California, Santa Cruz
Axelsson, Magnus
Sweden, Stockholm
Stockholms Universitet
Sweden, Stockholm
Oskar Klein Centre
Baldini, Luca
Italy, Pisa
Istituto Nazionale Di Fisica Nucleare, Sezione Di Pisa
Ballet, Jean
France, Gif-sur-yvette
Astrophysique, Instrumentation et Modélisation de Paris-saclay
Barbiellini, Guido
Italy, Trieste
Istituto Nazionale Di Fisica Nucleare, Sezione Di Trieste
Italy, Trieste
Università Degli Studi Di Trieste
Baring, Matthew G.
United States, Houston
Rice University
Bastieri, D.
Italy, Padua
Istituto Nazionale Di Fisica Nucleare, Sezione Di Padova
Italy, Padua
Università Degli Studi Di Padova
Bechtol, Keith C.
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Bellazzini, Ronaldo
Italy, Pisa
Istituto Nazionale Di Fisica Nucleare, Sezione Di Pisa
Berenji, B.
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Blandford, Rogerd D.
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Bloom, Elliott D.
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Bonamente, Emanuele
Italy, Perugia
Istituto Nazionale Di Fisica Nucleare, Sezione Di Perugia
Italy, Perugia
Università Degli Studi Di Perugia
Borgland, Anders W.
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Bregeon, Johan
Italy, Pisa
Istituto Nazionale Di Fisica Nucleare, Sezione Di Pisa
Brigida, Monica
Italy, Bari
Politecnico Di Bari
Italy, Bari
Istituto Nazionale Di Fisica Nucleare, Sezione Di Bari
Bruel, Philippe V.
France, Paris
In2p3 - Institut National de Physique Nucléaire et de Physique Des Particules
Burnett, Thompson H.
United States, Seattle
University of Washington
Caliandro, Giuseppe Andrea
Spain, Cerdanyola Del Valles
Universitat Autònoma de Barcelona
Cameron, Robert A.
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Camilo, Fernando
United States, New York
Columbia University
Caraveo, Patrizia A.
Italy, Milan
Inaf Istituto Di Astrofisica Spaziale e Fisica Cosmica, Milan
Casandjian, Jean Marc
France, Gif-sur-yvette
Astrophysique, Instrumentation et Modélisation de Paris-saclay
Cecchi, Claudia
Italy, Perugia
Istituto Nazionale Di Fisica Nucleare, Sezione Di Perugia
Italy, Perugia
Università Degli Studi Di Perugia
Çelik, Ö. Ö.
United States, Greenbelt
Nasa Goddard Space Flight Center
United States, Baltimore
University of Maryland, Baltimore County Umbc
Chekhtman, Alexandre
United States, Washington, D.c.
U.s. Naval Research Laboratory
United States, Fairfax
George Mason University
Cheung, Chi C.Teddy
United States, Washington, D.c.
U.s. Naval Research Laboratory
United States, Washington, D.c.
National Academy of Sciences
Chiang, James
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Ciprini, Stefano
Italy, Perugia
Università Degli Studi Di Perugia
Claus, Richard
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Cognard, Ismaël
France, Orleans
Laboratoire de Physique et de Chimie de L'environnement et de L'espace Lpc2e
France, Nancay
Station de Radioastronomie de Nancay
Cohen-Tanugi, Johann
France, Montpellier
Université de Montpellier
Cominsky, Lynn R.
United States, Rohnert Park
Sonoma State University
Conrad, Jan
Sweden, Stockholm
Oskar Klein Centre
Sweden, Stockholm
Stockholms Universitet
Dermer, Charles Dennison
United States, Washington, D.c.
U.s. Naval Research Laboratory
De Angelis, Alessandro D.
Italy, Udine
Università Degli Studi Di Udine
De Luca, Andrea D.
Italy, Pavia
Scuola Universitaria Superiore Iuss Di Pavia
de Palma, Francesco
Italy, Bari
Politecnico Di Bari
Italy, Bari
Istituto Nazionale Di Fisica Nucleare, Sezione Di Bari
Digel, Seth W.
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
do Couto E Silva, Eduardo
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Drell, Persis S.
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Dubois, Richard
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Dumora, Denis
France, Gradignan
Lp2i - Laboratoire de Physique Des Deux Infinis Bordeaux
Espinoza, Cristóbal M.
United Kingdom, Manchester
The University of Manchester
Farnier, Christian
France, Montpellier
Université de Montpellier
Favuzzi, Cecilia
Italy, Bari
Politecnico Di Bari
Italy, Bari
Istituto Nazionale Di Fisica Nucleare, Sezione Di Bari
Fegan, Stephen J.
France, Paris
In2p3 - Institut National de Physique Nucléaire et de Physique Des Particules
Ferrara, Elizabeth C.
United States, Greenbelt
Nasa Goddard Space Flight Center
Focke, Warren B.
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Frailis, Marco
Italy, Udine
Università Degli Studi Di Udine
Freire, Paulo C.C.
Puerto Rico, Arecibo
National Astronomy and Ionosphere Center Arecibo Observatory
Fukazawa, Yasushi
Japan, Higashihiroshima
Hiroshima University
Funk, Stefan
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Fusco, Piergiorgio G.
Italy, Bari
Politecnico Di Bari
Italy, Bari
Istituto Nazionale Di Fisica Nucleare, Sezione Di Bari
Gargano, Fabio
Italy, Bari
Istituto Nazionale Di Fisica Nucleare, Sezione Di Bari
Gasparrini, Dario
Italy, Rome
Agenzia Spaziale Italiana
Gehrels, Neil C.
United States, Greenbelt
Nasa Goddard Space Flight Center
United States, University Park
Pennsylvania State University
United States, College Park
University of Maryland, College Park
Germani, Stefano
Italy, Perugia
Istituto Nazionale Di Fisica Nucleare, Sezione Di Perugia
Italy, Perugia
Università Degli Studi Di Perugia
Giavitto, Gianluca
Italy, Trieste
Istituto Nazionale Di Fisica Nucleare, Sezione Di Trieste
Italy, Trieste
Università Degli Studi Di Trieste
Giebels, Berrie
France, Paris
In2p3 - Institut National de Physique Nucléaire et de Physique Des Particules
Giglietto, Nicola
Italy, Bari
Politecnico Di Bari
Italy, Bari
Istituto Nazionale Di Fisica Nucleare, Sezione Di Bari
Giordano, Francesco
Italy, Bari
Politecnico Di Bari
Italy, Bari
Istituto Nazionale Di Fisica Nucleare, Sezione Di Bari
Glanzman, Thomas
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Godfrey, Gary L.
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Grenier, Isabelle A.
France, Gif-sur-yvette
Astrophysique, Instrumentation et Modélisation de Paris-saclay
Grondin, Marie Hélène
France, Gradignan
Lp2i - Laboratoire de Physique Des Deux Infinis Bordeaux
Grove, J. Eric
United States, Washington, D.c.
U.s. Naval Research Laboratory
Guillemot, Lucas
France, Gradignan
Lp2i - Laboratoire de Physique Des Deux Infinis Bordeaux
Germany, Bonn
Max Planck Institute for Radio Astronomy
Guiriec, Sylvain
United States, Huntsville
The University of Alabama in Huntsville
Harding, Alice K.
United States, Greenbelt
Nasa Goddard Space Flight Center
Hayashida, Masaaki
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Hays, Elizabeth A.
United States, Greenbelt
Nasa Goddard Space Flight Center
Hughes, Richard E.
United States, Columbus
The Ohio State University
Jóhannesson, Gudlaugur
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Johnson, Anthony S.
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Johnson, Tyrel J.
United States, Greenbelt
Nasa Goddard Space Flight Center
United States, College Park
University of Maryland, College Park
Johnson, William Neil
United States, Washington, D.c.
U.s. Naval Research Laboratory
Johnston, Simon
Australia, Canberra
Commonwealth Scientific and Industrial Research Organisation
Kamae, Tsuneyoshi
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Katagiri, Hideaki
Japan, Higashihiroshima
Hiroshima University
Kataoka, Jun
Japan, Tokyo
Waseda University
Kawai, Nobuyuki
Japan, Tokyo
Tokyo Institute of Technology
Japan, Wako
Riken the Institute of Physical and Chemical Research
Kerr, Matthew T.
United States, Seattle
University of Washington
Kn̈odlseder, Jürgen
France, Toulouse
Université Toulouse Iii - Paul Sabatier
Kramer, Michael
United Kingdom, Manchester
The University of Manchester
Germany, Bonn
Max Planck Institute for Radio Astronomy
Kuss, Michael W.
France, Toulouse
Université Toulouse Iii - Paul Sabatier
Lande, Joshua
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Latronico, Luca
Italy, Pisa
Istituto Nazionale Di Fisica Nucleare, Sezione Di Pisa
Lemoine-Goumard, Marianne
France, Gradignan
Lp2i - Laboratoire de Physique Des Deux Infinis Bordeaux
Longo, Francesco
Italy, Trieste
Istituto Nazionale Di Fisica Nucleare, Sezione Di Trieste
Italy, Trieste
Università Degli Studi Di Trieste
Loparco, Francesco
Italy, Bari
Politecnico Di Bari
Italy, Bari
Istituto Nazionale Di Fisica Nucleare, Sezione Di Bari
Lott, Benoît
France, Gradignan
Lp2i - Laboratoire de Physique Des Deux Infinis Bordeaux
Lovellette, Michael N.
United States, Washington, D.c.
U.s. Naval Research Laboratory
Lubrano, Pasquale
Italy, Perugia
Istituto Nazionale Di Fisica Nucleare, Sezione Di Perugia
Italy, Perugia
Università Degli Studi Di Perugia
Lyne, Andrew G.
United Kingdom, Manchester
The University of Manchester
Mazziotta, Mario Nicola
Italy, Bari
Istituto Nazionale Di Fisica Nucleare, Sezione Di Bari
McEnery, Julie E.
United States, Greenbelt
Nasa Goddard Space Flight Center
United States, College Park
University of Maryland, College Park
Michelson, Peter F.
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Mitthumsiri, Warit
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Mizuno, Tsunefumi
Japan, Higashihiroshima
Hiroshima University
Moiseev, A. V.
United States, Greenbelt
Nasa Goddard Space Flight Center
United States, College Park
University of Maryland, College Park
Monzani, Maria Elena
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Moretti, Elena
Italy, Trieste
Istituto Nazionale Di Fisica Nucleare, Sezione Di Trieste
Italy, Trieste
Università Degli Studi Di Trieste
Morselli, Aldo
Italy, Rome
Università Degli Studi Di Roma Tor Vergata
Moskalenko, Igor V.
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Murgia, Simona
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Nakamori, Takeshi
Japan, Tokyo
Tokyo Institute of Technology
Nolan, Patrick L.
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Noutsos, Aristeidis
United Kingdom, Manchester
The University of Manchester
Nuss, Eric
France, Montpellier
Université de Montpellier
Ohsugi, Takashi
Japan, Higashihiroshima
Hiroshima University
Omodei, Nicola
Italy, Pisa
Istituto Nazionale Di Fisica Nucleare, Sezione Di Pisa
Orlando, E.
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Ormes, Jonathan F.
United States, Denver
University of Denver
Paneque, David
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Parent, Damien
France, Montpellier
Université de Montpellier
Pelassa, Vèronique
France, Montpellier
Université de Montpellier
Pesce-Rollins, Melissa
Italy, Pisa
Istituto Nazionale Di Fisica Nucleare, Sezione Di Pisa
Piron, Frédéric
France, Montpellier
Université de Montpellier
Porter, Troy A.
United States, Santa Cruz
University of California, Santa Cruz
Rainó, Silvia
Italy, Bari
Politecnico Di Bari
Italy, Bari
Istituto Nazionale Di Fisica Nucleare, Sezione Di Bari
Rando, Riccardo
Italy, Padua
Istituto Nazionale Di Fisica Nucleare, Sezione Di Padova
Italy, Padua
Università Degli Studi Di Padova
Ray, Paul S.
United States, Washington, D.c.
U.s. Naval Research Laboratory
Razzano, Massimiliano
Italy, Pisa
Istituto Nazionale Di Fisica Nucleare, Sezione Di Pisa
Reimer, Anita
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Austria, Innsbruck
Universität Innsbruck
Reimer, Olaf
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Austria, Innsbruck
Universität Innsbruck
Reposeur, Thierry
France, Gradignan
Lp2i - Laboratoire de Physique Des Deux Infinis Bordeaux
Ritz, Steven
United States, Santa Cruz
University of California, Santa Cruz
Rochester, Leon S.
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Rodríguez, Ana Y.
Spain, Cerdanyola Del Valles
Universitat Autònoma de Barcelona
Romani, Roger W.R.
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Sadrozinski, Hartmut F.W.
United States, Santa Cruz
University of California, Santa Cruz
Sánchez, David A.
France, Paris
In2p3 - Institut National de Physique Nucléaire et de Physique Des Particules
Saz-Parkinson, Pablo M.
United States, Santa Cruz
University of California, Santa Cruz
Scargle, Jefferey D.
United States, Moffett Field
Nasa Ames Research Center
Sgro', Carmelo
Italy, Pisa
Istituto Nazionale Di Fisica Nucleare, Sezione Di Pisa
Siskind, Eric J.
United States, Rocky Point
Nycb Realtime Computing Inc.
Smith, David A.
France, Gradignan
Lp2i - Laboratoire de Physique Des Deux Infinis Bordeaux
Spandre, G.
Italy, Pisa
Istituto Nazionale Di Fisica Nucleare, Sezione Di Pisa
Spinelli, Paolo
Italy, Bari
Politecnico Di Bari
Italy, Bari
Istituto Nazionale Di Fisica Nucleare, Sezione Di Bari
Stappers, Benjamin W.
United Kingdom, Manchester
The University of Manchester
Strickman, Mark S.
United States, Washington, D.c.
U.s. Naval Research Laboratory
Suson, Daniel J.
United States, Westville
Purdue University Northwest
Tajima, Hiroyasu
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Takahashi, Hiromitsu
Japan, Higashihiroshima
Hiroshima University
Thayer, Jana B.
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Theureau, Gilles
France, Orleans
Laboratoire de Physique et de Chimie de L'environnement et de L'espace Lpc2e
France, Nancay
Station de Radioastronomie de Nancay
Thompson, David J.
United States, Greenbelt
Nasa Goddard Space Flight Center
Thorsett, Stephen E.
United States, Santa Cruz
University of California, Santa Cruz
Tibaldo, Luigi
France, Gif-sur-yvette
Astrophysique, Instrumentation et Modélisation de Paris-saclay
Italy, Padua
Istituto Nazionale Di Fisica Nucleare, Sezione Di Padova
Italy, Padua
Università Degli Studi Di Padova
Torres, Diego F.
Spain, Cerdanyola Del Valles
Universitat Autònoma de Barcelona
Spain, Barcelona
Institució Catalana de Recerca I Estudis Avançats
Tosti, Gino
Italy, Perugia
Istituto Nazionale Di Fisica Nucleare, Sezione Di Perugia
Italy, Perugia
Università Degli Studi Di Perugia
Tramacere, Andrea
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Uchiyama, Yasunobu
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Usher, Tracy L.
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Vilchez, Nicolas P.E.
France, Toulouse
Université Toulouse Iii - Paul Sabatier
Vitale, V.
Italy, Rome
Università Degli Studi Di Roma Tor Vergata
Waite, A. P.
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Wang, Peng George
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Weltevrede, Patrick
United Kingdom, Manchester
The University of Manchester
Wood, Kent S.
United States, Washington, D.c.
U.s. Naval Research Laboratory
Statistics
Citations: 266
Authors: 164
Affiliations: 57
Identifiers
Doi:
10.1088/0004-637X/708/2/1254
ISSN:
0004637X
Research Areas
Cancer
Environmental
Study Design
Cross Sectional Study
Study Approach
Quantitative