The Vela Pulsar: Results from the First Year of Fermi LAT Observations

A. A. Abdo; Markus Ackermann; Marco Ajello; A. Allafort; W. B. Atwood; Luca Baldini; Jean Ballet; Guido Barbiellini; M. G. Baring; D. Bastieri; B. M. Baughman; K. Bechtol; R. Bellazzini; B. Berenji; R. D. Blandford; E. D. Bloom; E. Bonamente; A. W. Borgland; A. Bouvier; J. Bregeon; A. Brez; M. Brigida; Pascal Bruel; T. H. Burnett; S. Buson; G. A. Caliandro; R. A. Cameron; P. A. Caraveo; S. Carrigan; J. M. Casandjian; C. Cecchi; O. Celik; A. Chekhtman; C. C. Cheung; J. Chiang; S. Ciprini; R. Claus; J. Cohen-Tanugi; J. Conrad; C. D. Dermer; A. de Luca; F. de Palma; M. Dormody; E. Do Couto E Silva; P. S. Drell; R. Dubois; D. Dumora; C. Farnier; C. Favuzzi; S. J. Fegan; W. B. Focke; P. Fortin; M. Frailis; Y. Fukazawa; S. Funk; P. Fusco; F. Gargano; D. Gasparrini; N. Gehrels; S. Germani; G. Giavitto; B. Giebels; N. Giglietto; F. Giordano; T. Glanzman; G. Godfrey; I. A. Grenier; M.-H. Grondin; J. E. Grove; L. Guillemot; S. Guiriec; D. Hadasch; A. K. Harding; E. Hays; G. Hobbs; D. Horan; R. E. Hughes; M. S. Jackson; G. Johannesson; A. S. Johnson; T. J. Johnson; W. N. Johnson; T. Kamae; H. Katagiri; J. Kataoka; N. Kawai; M. Kerr; Jürgen Knödlseder; M. Kuss; J. Lande; L. Latronico; S.-H. Lee; M. Lemoine-Goumard; M. Llena Garde; F. Longo; F. Loparco; B. Lott; M. N. Lovellette; P. Lubrano; A. Makeev; R. N. Manchester; M. Marelli; M. N. Mazziotta; W. Mcconville; J. E. Mcenery; S. Mcglynn; C. Meurer; P. F. Michelson; W. Mitthumsiri; T. Mizuno; A. A. Moiseev; C. Monte; M. E. Monzani; A. Morselli; I. V. Moskalenko; S. Murgia; T. Nakamori; P. L. Nolan; J. P. Norris; A. Noutsos; E. Nuss; T. Ohsugi; N. Omodei; E. Orlando; J. F. Ormes; M. Ozaki; D. Paneque; J. H. Panetta; D. Parent; V. Pelassa; M. Pepe; M. Pesce-Rollins; M. Pierbattista; F. Piron; T.A. Porter; S. Raino; R. Rando; P. S. Ray; M. Razzano; A. Reimer; O. Reimer; T. Reposeur; S. Ritz; L. S. Rochester; A. Y. Rodriguez; R. W. Romani; M. Roth; F. Ryde; H. F.-W. Sadrozinski; A. Sander; P. M. Saz Parkinson; C. Sgro; E. J. Siskind; David Stanley Smith; P. D. Smith; G. Spandre; P. Spinelli; Jean-Luc Starck; M. S. Strickman; D. J. Suson; H. Takahashi; T. Takahashi; T. Tanaka; J. B. Thayer; J. G. Thayer; D. J. Thompson; L. Tibaldo; D. F. Torres; G. Tosti; A. Tramacere; T. L. Usher; A. van Etten; V. Vasileiou; C. Venter; N. Vilchez; V. Vitale; A. P. Waite; P. Wang; K. Watters; P. Weltevrede; B. L. Winer; K. S. Wood; T. Ylinen; M. Ziegler

doi:10.1088/0004-637X/713/1/154

Back

The Vela Pulsar: Results from the First Year of Fermi LAT Observations

Journal article

Peer reviewed

The Vela Pulsar: Results from the First Year of Fermi LAT Observations

A. A. Abdo, Markus Ackermann, Marco Ajello, A. Allafort, W. B. Atwood, Luca Baldini, Jean Ballet, Guido Barbiellini, M. G. Baring, D. Bastieri, …

The Astrophysical Journal, Vol.713, pp.154-165

10/04/2010

DOI: https://doi.org/10.1088/0004-637X/713/1/154

Abstract

pulsars: general

stars: neutron

We report on analysis of timing and spectroscopy of the Vela pulsar using eleven months of observations with the Large Area Telescope on the Fermi Gamma-Ray Space Telescope. The intrinsic brightness of Vela at GeV energies combined with the angular resolution and sensitivity of the LAT allow us to make the most detailed study to date of the energy-dependent light curves and phase-resolved spectra, using a LAT-derived timing model. The light curve consists of two peaks (P1 and P2) connected by bridge emission containing a third peak (P3). We have confirmed the strong decrease of the P1/P2 ratio with increasing energy seen with EGRET and previous Fermi LAT data, and observe that P1 disappears above 20 GeV. The increase with energy of the mean phase of the P3 component can be followed with much greater detail, showing that P3 and P2 are present up to the highest energies of pulsation. We find significant pulsed emission at phases outside the main profile, indicating that magnetospheric emission exists over 80% of the pulsar period. With increased high-energy counts the phase-averaged spectrum is seen to depart from a power- law with simple exponential cutoff, and is better fit with a more gradual cutoff. The spectra in fixed-count phase bins are well fit with power-laws with exponential cutoffs, revealing a strong and complex phase dependence of the cutoff energy, especially in the peaks. By combining these results with predictions of the outer magnetosphere models that map emission characteristics to phase, it will be possible to probe the particle acceleration and the structure of the pulsar magnetosphere with unprecedented detail.

Files and links (1)

url

Find in HALView

Metrics

1 Record Views

Details

Title: The Vela Pulsar: Results from the First Year of Fermi LAT Observations
Creators - without role: A. A. Abdo
Markus Ackermann - Kavli Institute for Particle Astrophysics and Cosmology
Marco Ajello - Stanford University
A. Allafort - Kavli Institute for Particle Astrophysics and Cosmology
W. B. Atwood
Luca Baldini - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
Jean Ballet - Astrophysique, Instrumentation et Modélisation
Guido Barbiellini - University of Trieste
M. G. Baring
D. Bastieri - University of Padua
B. M. Baughman
K. Bechtol - Kavli Institute for Particle Astrophysics and Cosmology
R. Bellazzini - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
B. Berenji - Stanford University
R. D. Blandford
E. D. Bloom
E. Bonamente - University of Perugia
A. W. Borgland
A. Bouvier - Kavli Institute for Particle Astrophysics and Cosmology
J. Bregeon - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
A. Brez - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
M. Brigida - Polytechnic University of Bari
Pascal Bruel - École Polytechnique
T. H. Burnett
S. Buson - Istituto Nazionale di Fisica Nucleare, Sezione di Padova
G. A. Caliandro
R. A. Cameron
P. A. Caraveo - Istituto di Astrofisica Spaziale e Fisica Cosmica di Milano
S. Carrigan - University of Padua
J. M. Casandjian - Astrophysique Interprétation Modélisation
C. Cecchi - University of Perugia
O. Celik - Goddard Space Flight Center
A. Chekhtman - United States Naval Research Laboratory
C. C. Cheung
J. Chiang - Kavli Institute for Particle Astrophysics and Cosmology
S. Ciprini - University of Perugia
R. Claus - Kavli Institute for Particle Astrophysics and Cosmology
J. Cohen-Tanugi - Laboratoire de Physique Théorique
J. Conrad - Stockholm University
C. D. Dermer
A. de Luca - Istituto Universitario di Studi Superiori di Pavia
F. de Palma - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
M. Dormody - University of California, Santa Cruz
E. Do Couto E Silva
P. S. Drell
R. Dubois - Kavli Institute for Particle Astrophysics and Cosmology
D. Dumora - Laboratoire de Physique des deux infinis Bordeaux
C. Farnier - Laboratoire de Physique Théorique
C. Favuzzi - Polytechnic University of Bari
S. J. Fegan - Laboratoire Leprince-Ringuet
W. B. Focke
P. Fortin - Centre National de la Recherche Scientifique
M. Frailis - Trieste Astronomical Observatory
Y. Fukazawa - Fraunhofer Chalmers Research Centre for Industrial Mathematics
S. Funk - Stanford University
P. Fusco - Polytechnic University of Bari
F. Gargano - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
D. Gasparrini - Fraunhofer Chalmers Research Centre for Industrial Mathematics
N. Gehrels - Goddard Space Flight Center
S. Germani - University of Perugia
G. Giavitto - University of Trieste
B. Giebels - Laboratoire Leprince-Ringuet
N. Giglietto - Polytechnic University of Bari
F. Giordano - Fraunhofer Chalmers Research Centre for Industrial Mathematics
T. Glanzman - Fraunhofer Chalmers Research Centre for Industrial Mathematics
G. Godfrey - Fraunhofer Chalmers Research Centre for Industrial Mathematics
I. A. Grenier - Astrophysique Interprétation Modélisation
M.-H. Grondin - Institut National de Physique Nucléaire et de Physique des Particules
J. E. Grove
L. Guillemot - Fraunhofer Chalmers Research Centre for Industrial Mathematics
S. Guiriec - University of Alabama in Huntsville
D. Hadasch - Institució Catalana de Recerca i Estudis Avançats
A. K. Harding
E. Hays - Fraunhofer Chalmers Research Centre for Industrial Mathematics
G. Hobbs - Commonwealth Scientific and Industrial Research Organisation
D. Horan - AlbaNova
R. E. Hughes
M. S. Jackson
G. Johannesson - Fraunhofer Chalmers Research Centre for Industrial Mathematics
A. S. Johnson
T. J. Johnson
W. N. Johnson
T. Kamae - AlbaNova
H. Katagiri - AlbaNova
J. Kataoka - Waseda University
N. Kawai - RIKEN
M. Kerr - University of Washington
Jürgen Knödlseder - Université Toulouse III - Paul Sabatier
M. Kuss - Fraunhofer Chalmers Research Centre for Industrial Mathematics
J. Lande - Fraunhofer Chalmers Research Centre for Industrial Mathematics
L. Latronico - Fraunhofer Chalmers Research Centre for Industrial Mathematics
S.-H. Lee - Fraunhofer Chalmers Research Centre for Industrial Mathematics
M. Lemoine-Goumard - Fraunhofer Chalmers Research Centre for Industrial Mathematics
M. Llena Garde
F. Longo - Fraunhofer Chalmers Research Centre for Industrial Mathematics
F. Loparco - Fraunhofer Chalmers Research Centre for Industrial Mathematics
B. Lott - Fraunhofer Chalmers Research Centre for Industrial Mathematics
M. N. Lovellette
P. Lubrano - Fraunhofer Chalmers Research Centre for Industrial Mathematics
A. Makeev - George Mason University
R. N. Manchester
M. Marelli - Istituto di Astrofisica Spaziale e Fisica Cosmica di Milano
M. N. Mazziotta
W. Mcconville - Fraunhofer Chalmers Research Centre for Industrial Mathematics
J. E. Mcenery
S. Mcglynn - Fraunhofer Chalmers Research Centre for Industrial Mathematics
C. Meurer - AlbaNova
P. F. Michelson
W. Mitthumsiri - Fraunhofer Chalmers Research Centre for Industrial Mathematics
T. Mizuno - Fraunhofer Chalmers Research Centre for Industrial Mathematics
A. A. Moiseev
C. Monte - AlbaNova
M. E. Monzani
A. Morselli - Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata
I. V. Moskalenko
S. Murgia - Fraunhofer Chalmers Research Centre for Industrial Mathematics
T. Nakamori - Fraunhofer Chalmers Research Centre for Industrial Mathematics
P. L. Nolan
J. P. Norris
A. Noutsos - AlbaNova
E. Nuss - Laboratoire de Physique Théorique
T. Ohsugi - Hiroshima University
N. Omodei - AlbaNova
E. Orlando - Max Planck Institute for Extraterrestrial Physics
J. F. Ormes
M. Ozaki - Institute of Space and Astronautical Science
D. Paneque - Fraunhofer Chalmers Research Centre for Industrial Mathematics
J. H. Panetta
D. Parent - Fraunhofer Chalmers Research Centre for Industrial Mathematics
V. Pelassa - Fraunhofer Chalmers Research Centre for Industrial Mathematics
M. Pepe - Fraunhofer Chalmers Research Centre for Industrial Mathematics
M. Pesce-Rollins - Fraunhofer Chalmers Research Centre for Industrial Mathematics
M. Pierbattista - Fraunhofer Chalmers Research Centre for Industrial Mathematics
F. Piron - Fraunhofer Chalmers Research Centre for Industrial Mathematics
T.A. Porter - Fraunhofer Chalmers Research Centre for Industrial Mathematics
S. Raino - Fraunhofer Chalmers Research Centre for Industrial Mathematics
R. Rando - University of Padua
P. S. Ray
M. Razzano - Fraunhofer Chalmers Research Centre for Industrial Mathematics
A. Reimer - Fraunhofer Chalmers Research Centre for Industrial Mathematics
O. Reimer - Fraunhofer Chalmers Research Centre for Industrial Mathematics
T. Reposeur - Fraunhofer Chalmers Research Centre for Industrial Mathematics
S. Ritz - AlbaNova
L. S. Rochester
A. Y. Rodriguez
R. W. Romani
M. Roth - AlbaNova
F. Ryde - Fraunhofer Chalmers Research Centre for Industrial Mathematics
H. F.-W. Sadrozinski
A. Sander - Fraunhofer Chalmers Research Centre for Industrial Mathematics
P. M. Saz Parkinson
C. Sgro - Fraunhofer Chalmers Research Centre for Industrial Mathematics
E. J. Siskind
David Stanley Smith - Laboratoire de Physique des deux infinis Bordeaux
P. D. Smith
G. Spandre - Fraunhofer Chalmers Research Centre for Industrial Mathematics
P. Spinelli - AlbaNova
Jean-Luc Starck - Astrophysique Interprétation Modélisation
M. S. Strickman
D. J. Suson
H. Takahashi - Fraunhofer Chalmers Research Centre for Industrial Mathematics
T. Takahashi - Fraunhofer Chalmers Research Centre for Industrial Mathematics
T. Tanaka - AlbaNova
J. B. Thayer
J. G. Thayer
D. J. Thompson
L. Tibaldo - Fraunhofer Chalmers Research Centre for Industrial Mathematics
D. F. Torres
G. Tosti - Fraunhofer Chalmers Research Centre for Industrial Mathematics
A. Tramacere - Consorzio Interuniversitario Fisica Spaziale
T. L. Usher
A. van Etten
V. Vasileiou - University of Maryland, Baltimore County
C. Venter - North-West University
N. Vilchez - AlbaNova
V. Vitale - University of Rome Tor Vergata
A. P. Waite
P. Wang - Fraunhofer Chalmers Research Centre for Industrial Mathematics
K. Watters - Fraunhofer Chalmers Research Centre for Industrial Mathematics
P. Weltevrede - University of Manchester
B. L. Winer
K. S. Wood
T. Ylinen
M. Ziegler - Fraunhofer Chalmers Research Centre for Industrial Mathematics
Publication Details: The Astrophysical Journal, Vol.713, pp.154-165
Identifiers: 9941590609311
Academic Unit: Université de Montpellier
Language: English
Resource Type: Journal article
Local Fields: in2p3-00482639