PSR J2021+4026 IN THE GAMMA CYGNI REGION: THE FIRST VARIABLE γ-RAY PULSAR SEEN BY THE Fermi LAT - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Journal Articles The Astrophysical journal letters Year : 2013

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

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

Abstract

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.

Dates and versions

in2p3-00915598 , version 1 (09-12-2013)

Identifiers

Cite

A. Allafort, Luca Baldini, Jean Ballet, Guido Barbiellini, D. Bastieri, et al.. PSR J2021+4026 IN THE GAMMA CYGNI REGION: THE FIRST VARIABLE γ-RAY PULSAR SEEN BY THE Fermi LAT. The Astrophysical journal letters, 2013, 777, pp.L2. ⟨10.1088/2041-8205/777/1/L2⟩. ⟨in2p3-00915598⟩
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