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Journal articles
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
1
Guido Barbiellini
D. Bastieri
R. Bellazzini
E. Bonamente
E. Bottacini
T. J. Brandt
2
J. Bregeon
Pascal Bruel
3
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
4
D. Gasparrini
N. Giglietto
M. Giroletti
T. Glanzman
G. Godfrey
S. Guiriec
D. Hadasch
5
A. K. Harding
M. Hayashida
K. Hayashi
E. Hays
J. Hewitt
D. Horan
3
T. Jogler
M. Kerr
J. Kn̈odlseder
J. Lande
S. Larsson
L. Latronico
M. Lemoine-Goumard
F. Longo
F. Loparco
4
P. Lubrano
D. Malyshev
M. Marelli
M. Mayer
M. N. Mazziotta
J. Mehault
6
T. Mizuno
M. E. Monzani
A. Morselli
S. Murgia
N. Omodei
M. Orienti
E. Orlando
D. Paneque
M. Pesce-Rollins
M. Pierbattista
1
F. Piron
6
G. Pivato
T.A. Porter
R. Rando
M. Razzano
T. Reposeur
7
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
6
C. Venter
G. Vianello
V. Vitale
B. L. Winer
K. S. Wood
A. Allafort
Author
Luca Baldini
Author
Jean Ballet 1
Author Employer institution : Département de Physique Nucléaire (ex SPhN)
Guido Barbiellini
Author
T. J. Brandt 2
Author
J. Bregeon
Author
Pascal Bruel 3
Author Employer institution : Centre National de la Recherche Scientifique
R. Buehler
Author
D. Horan 3
Author
T. Jogler
Author
M. Kerr
Author
J. Kn̈odlseder
Author IdHAL : jurgen-knodlseder ORCID : https://orcid.org/0000-0002-0014-7809
M. Pesce-Rollins
Author
M. Pierbattista 1
Author
F. Piron 6
Author IdHAL : frederic-piron ORCID : https://orcid.org/0000-0001-6885-7156
G. Pivato
Author
K. S. Wood
Author
1
AIM (UMR_7158 / UMR_E_9005 / UM_112) - Astrophysique Interprétation Modélisation (AIM - UMR 7158 - UMR E 9005,
ex "Astrophysique Interactions Multi-échelles",
Service d'astrophysique,
CEA/Saclay,
Orme des Merisiers
F-91191 GIF SUR YVETTE CEDEX - France)
- CNRS - Centre National de la Recherche Scientifique : UMR_7158 (France)
- INSU - CNRS - Institut national des sciences de l'Univers (INSU-CNRS 3 rue Michel-Ange, 75794 Paris Cedex 16 - France)
- CEA - Commissariat à l'énergie atomique et aux énergies alternatives : UMR_E_9005 (Centre de Saclay Centre de Grenoble Centre de Cadarache etc - France)
- UPD7 - Université Paris Diderot - Paris 7 : UMR_7158 (5 rue Thomas-Mann - 75205 Paris cedex 13 - France)
2
IRAP - Institut de recherche en astrophysique et planétologie (9 avenue Colonel Roche 31028 Toulouse - France)
- CNRS - Centre National de la Recherche Scientifique : UMR5277 (France)
- OMP - Observatoire Midi-Pyrénées (14 avenue Edouard Belin, 31400 TOULOUSE - France)
- Université Fédérale Toulouse Midi-Pyrénées (41 Allée Jules Guesde, 31000 Toulouse - France)
- UT3 - Université Toulouse III - Paul Sabatier (118 route de Narbonne - 31062 Toulouse - France)
- Université Fédérale Toulouse Midi-Pyrénées (41 Allée Jules Guesde, 31000 Toulouse - France)
- INSU - CNRS - Institut national des sciences de l'Univers : UMR5277 (INSU-CNRS 3 rue Michel-Ange, 75794 Paris Cedex 16 - France)
3
LLR - Laboratoire Leprince-Ringuet (Route de Saclay - 91128 Palaiseau Cedex - France)
- CNRS - Centre National de la Recherche Scientifique : UMR7638 (France)
- X - École polytechnique (École polytechnique, 91128 Palaiseau Cedex - France)
- IN2P3 - Institut National de Physique Nucléaire et de Physique des Particules du CNRS (France)
4
INFN, sezione di Bari - Istituto Nazionale di Fisica Nucleare, sezione di Bari (Via Orabona, 4 70126 Bari - Italy)
5
IEEC-CSIC (Spain)
- UAB - Universitat Autònoma de Barcelona [Barcelona] (UAB Campus 08193 Bellaterra Barcelona - Spain)
6
LUPM - Laboratoire Univers et Particules de Montpellier (Université de Montpellier Place Eugène Bataillon - CC 72 34095 Montpellier Cédex 05 - France)
- UM - Université de Montpellier (163 rue Auguste Broussonnet - 34090 Montpellier - France)
- UM2 - Université Montpellier 2 - Sciences et Techniques (Place Eugène Bataillon - 34095 Montpellier cedex 5 - France)
- IN2P3 - Institut National de Physique Nucléaire et de Physique des Particules du CNRS (France)
- CNRS - Centre National de la Recherche Scientifique : UMR5299 (France)
7
FERMI (France)
- CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan (Chemin du Solarium - BP 120 - 33175 Gradignan Cedex - France)
- Université Sciences et Technologies - Bordeaux 1 (351 cours de la Libération - 33405 Talence cedex - France)
- IN2P3 - Institut National de Physique Nucléaire et de Physique des Particules du CNRS (France)
- CNRS - Centre National de la Recherche Scientifique : UMR5797 (France)
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.
Document type :
Journal articles
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http://hal.in2p3.fr/in2p3-00915598
Contributor : Nathalie Martin <>
Submitted on : Monday, December 9, 2013 - 9:25:45 AM
Last modification on : Saturday, June 20, 2020 - 4:18:04 PM
Contributor : Nathalie Martin <>
Submitted on : Monday, December 9, 2013 - 9:25:45 AM
Last modification on : Saturday, June 20, 2020 - 4:18:04 PM
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- HAL Id : in2p3-00915598, version 1
- DOI : 10.1088/2041-8205/777/1/L2
Collections
IN2P3 | INSU | CEA | CENBG | LLR | CNRS | X | X-LLR | OMP | LUPM | OMP-IRAP | MIPS | DSM-IRFU | IRFU-AIM | UNIV-MONTPELLIER | CEA-DRF | X-DEP-PHYS | UNIV-PARIS7 | USPC | LUPM_EMA | UNIV-TLSE3 | UP-SCIENCES
Citation
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, Bristol : IOP Publishing, 2013, 777, pp.L2. ⟨10.1088/2041-8205/777/1/L2⟩. ⟨in2p3-00915598⟩
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