PSR J2021+4026 IN THE GAMMA CYGNI REGION: THE FIRST VARIABLE γ-RAY PULSAR SEEN BY THE Fermi LAT

A. Allafort; Luca Baldini; Jean Ballet; Guido Barbiellini; D. Bastieri; R. Bellazzini; E. Bonamente; E. Bottacini; T. J. Brandt; J. Bregeon; Pascal Bruel; R. Buehler; G. A. Caliandro; R. A. Cameron; P. A. Caraveo; C. Cecchi; R.C.G. Chaves; A. Chekhtman; G. Chiaro; R. Claus; F. d'Ammando; F. de Palma; L. Di Venere; P. S. Drell; C. Favuzzi; E. C. Ferrara; A. Franckowiak; F. Gargano; D. Gasparrini; N. Giglietto; M. Giroletti; T. Glanzman; G. Godfrey; S. Guiriec; D. Hadasch; A. K. Harding; M. Hayashida; K. Hayashi; E. Hays; J. Hewitt; D. Horan; T. Jogler; M. Kerr; Jürgen Knödlseder; J. Lande; S. Larsson; L. Latronico; M. Lemoine-Goumard; F. Longo; F. Loparco; P. Lubrano; D. Malyshev; M. Marelli; M. Mayer; M. N. Mazziotta; J. Mehault; T. Mizuno; M. E. Monzani; A. Morselli; S. Murgia; N. Omodei; M. Orienti; E. Orlando; D. Paneque; M. Pesce-Rollins; M. Pierbattista; F. Piron; G. Pivato; T.A. Porter; R. Rando; M. Razzano; T. Reposeur; A. Sartori; P. M. Saz Parkinson; C. Sgro; P. Spinelli; A. W. Strong; H. Takahashi; J. B. Thayer; D. J. Thompson; L. Tibaldo; M. Tinivella; D. F. Torres; G. Tosti; Y. Uchiyama; T. L. Usher; J. Vandenbroucke; V. Vasileiou; C. Venter; G. Vianello; V. Vitale; B. L. Winer; K. S. Wood

doi:10.1088/2041-8205/777/1/L2

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PSR J2021+4026 IN THE GAMMA CYGNI REGION: THE FIRST VARIABLE γ-RAY PULSAR SEEN BY THE Fermi LAT

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PSR J2021+4026 IN THE GAMMA CYGNI REGION: THE FIRST VARIABLE γ-RAY PULSAR SEEN BY THE Fermi LAT

A. Allafort, Luca Baldini, Jean Ballet, Guido Barbiellini, D. Bastieri, R. Bellazzini, E. Bonamente, E. Bottacini, T. J. Brandt, J. Bregeon, …

The Astrophysical Journal Letters, Vol.777

2013

DOI: https://doi.org/10.1088/2041-8205/777/1/L2

Abstract

gamma rays: stars

pulsars: individual (PSR J2021+4026)

stars: neutron

Long-term monitoring of PSR J2021+4026 in the heart of the Cygnus region with the Fermi Large Area Telescope unveiled a sudden decrease in flux above 100 MeV over a timescale shorter than a week. The "jump" was near MJD 55850 (2011 October 16), with the flux decreasing from (8.33 ± 0.08) × 10-10 erg cm-2 s-1 to (6.86 ± 0.13) × 10-10 erg cm-2 s-1. Simultaneously, the frequency spindown rate increased from (7.8 ± 0.1) × 10-13 Hz s-1 to (8.1 ± 0.1) × 10-13 Hz s-1. Significant (>5σ) changes in the pulse profile and marginal (<3σ) changes in the emission spectrum occurred at the same time. There is also evidence for a small, steady flux increase over the 3 yr preceding MJD 55850. This is the first observation at γ-ray energies of mode changes and intermittent behavior, observed at radio wavelengths for other pulsars. We argue that the change in pulsed γ-ray emission is due to a change in emission beaming and we speculate that it is precipitated by a shift in the magnetic field structure, leading to a change of either effective magnetic inclination or effective current.

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Title: PSR J2021+4026 IN THE GAMMA CYGNI REGION: THE FIRST VARIABLE γ-RAY PULSAR SEEN BY THE Fermi LAT
Creators - without role: A. Allafort - Kavli Institute for Particle Astrophysics and Cosmology
Luca Baldini - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
Jean Ballet - Astrophysique, Instrumentation et Modélisation
Guido Barbiellini - University of Trieste
D. Bastieri - University of Padua
R. Bellazzini - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
E. Bonamente - University of Perugia
E. Bottacini - Kavli Institute for Particle Astrophysics and Cosmology
T. J. Brandt - Institut de Recherche en Astrophysique et Planétologie
J. Bregeon - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
Pascal Bruel - École Polytechnique
R. Buehler - Deutsches Elektronen-Synchrotron DESY
G. A. Caliandro
R. A. Cameron
P. A. Caraveo - Istituto di Astrofisica Spaziale e Fisica Cosmica di Milano
C. Cecchi - University of Perugia
R.C.G. Chaves - Institut de Recherche sur les Lois Fondamentales de l'Univers
A. Chekhtman - George Mason University
G. Chiaro - University of Padua
R. Claus - Kavli Institute for Particle Astrophysics and Cosmology
F. d'Ammando
F. de Palma - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
L. Di Venere - Kavli Institute for Particle Astrophysics and Cosmology
P. S. Drell
C. Favuzzi - Polytechnic University of Bari
E. C. Ferrara
A. Franckowiak - Kavli Institute for Particle Astrophysics and Cosmology
F. Gargano - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
D. Gasparrini - Agenzia Spaziale Italiana
N. Giglietto - Polytechnic University of Bari
M. Giroletti - Istituto di Radioastronomia di Bologna
T. Glanzman - Stanford University
G. Godfrey - Kavli Institute for Particle Astrophysics and Cosmology
S. Guiriec - Goddard Space Flight Center
D. Hadasch - Institute of Space Sciences
A. K. Harding
M. Hayashida - SLAC National Accelerator Laboratory
K. Hayashi - Institute of Space and Astronautical Science
E. Hays - Goddard Space Flight Center
J. Hewitt - Goddard Space Flight Center
D. Horan - Laboratoire Leprince-Ringuet
T. Jogler - Stanford University
M. Kerr - SLAC National Accelerator Laboratory
Jürgen Knödlseder - Université Toulouse III - Paul Sabatier
J. Lande - Kavli Institute for Particle Astrophysics and Cosmology
S. Larsson - Stockholm University
L. Latronico - Istituto Nazionale di Fisica Nucleare, Sezione di Torino
M. Lemoine-Goumard - Laboratoire de Physique des deux infinis Bordeaux
F. Longo - University of Trieste
F. Loparco - Polytechnic University of Bari
P. Lubrano - University of Perugia
D. Malyshev - Kavli Institute for Particle Astrophysics and Cosmology
M. Marelli - Istituto di Astrofisica Spaziale e Fisica Cosmica di Milano
M. Mayer - Deutsches Elektronen-Synchrotron DESY
M. N. Mazziotta
J. Mehault - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
T. Mizuno - Hiroshima University
M. E. Monzani
A. Morselli - Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata
S. Murgia - Kavli Institute for Particle Astrophysics and Cosmology
N. Omodei - Kavli Institute for Particle Astrophysics and Cosmology
M. Orienti - Istituto di Radioastronomia di Bologna
E. Orlando - Kavli Institute for Particle Astrophysics and Cosmology
D. Paneque - Max Planck Institute for Physics
M. Pesce-Rollins - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
M. Pierbattista - Istituto di Astrofisica Spaziale e Fisica Cosmica di Milano
F. Piron - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
G. Pivato - University of Padua
T.A. Porter - Kavli Institute for Particle Astrophysics and Cosmology
R. Rando - Istituto Nazionale di Fisica Nucleare, Sezione di Padova
M. Razzano - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
T. Reposeur - Laboratoire de Physique des deux infinis Bordeaux
A. Sartori - Istituto di Astrofisica Spaziale e Fisica Cosmica di Milano
P. M. Saz Parkinson
C. Sgro - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
P. Spinelli - Polytechnic University of Bari
A. W. Strong
H. Takahashi - Hiroshima University
J. B. Thayer
D. J. Thompson
L. Tibaldo - Kavli Institute for Particle Astrophysics and Cosmology
M. Tinivella - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
D. F. Torres
G. Tosti - Istituto Nazionale di Fisica Nucleare, Sezione di Perugia
Y. Uchiyama
T. L. Usher
J. Vandenbroucke - Kavli Institute for Particle Astrophysics and Cosmology
V. Vasileiou - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
C. Venter - North-West University
G. Vianello - Kavli Institute for Particle Astrophysics and Cosmology
V. Vitale - Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata
B. L. Winer
K. S. Wood
Publication Details: The Astrophysical Journal Letters, Vol.777
Identifiers: 9938980509311
Academic Unit: Laboratoire Univers et Particules de Montpellier - LUPM
Language: English
Resource Type: Journal article
Local Fields: in2p3-00915598