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

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

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A. Allafort

Function : Author

Luca Baldini

Function : Author

Jean Ballet

Function : Author

Astrophysique Interprétation Modélisation

Guido Barbiellini

Function : Author

D. Bastieri

Function : Author

R. Bellazzini

Function : Author

E. Bonamente

Function : Author

E. Bottacini

Function : Author

T. J. Brandt

Function : Author

Institut de recherche en astrophysique et planétologie

J. Bregeon

Function : Author
PersonId : 741214
IdHAL : johan-bregeon
ORCID : 0000-0002-6790-5328
IdRef : 095856943

Pascal Bruel

Function : Author

Laboratoire Leprince-Ringuet

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

Function : Author
PersonId : 769090
ORCID : 0000-0003-0703-824X

P. S. Drell

Function : Author

C. Favuzzi

Function : Author

E. C. Ferrara

Function : Author

A. Franckowiak

Function : Author

F. Gargano

Function : Author

Istituto Nazionale di Fisica Nucleare, sezione di Bari

D. Gasparrini

Function : Author

N. Giglietto

Function : Author
PersonId : 755413
ORCID : 0000-0002-9021-2888

M. Giroletti

Function : Author

T. Glanzman

Function : Author

G. Godfrey

Function : Author

S. Guiriec

Function : Author

D. Hadasch

Function : Author
PersonId : 761675
ORCID : 0000-0001-8663-6461

IEEC-CSIC

A. K. Harding

Function : Author

M. Hayashida

Function : Author

K. Hayashi

Function : Author

E. Hays

Function : Author

J. Hewitt

Function : Author

D. Horan

Function : Author

Laboratoire Leprince-Ringuet

T. Jogler

Function : Author

M. Kerr

Function : Author

Jürgen Knödlseder

Function : Author
PersonId : 178646
IdHAL : jurgen-knodlseder
ORCID : 0000-0002-0014-7809
IdRef : 069521360

J. Lande

Function : Author

S. Larsson

Function : Author

L. Latronico

Function : Author

M. Lemoine-Goumard

Function : Author
PersonId : 1416454
IdHAL : marianne-lemoine-goumard
IdRef : 111693608

F. Longo

Function : Author
PersonId : 755442
ORCID : 0000-0003-2501-2270

F. Loparco

Function : Author

Istituto Nazionale di Fisica Nucleare, sezione di Bari

P. Lubrano

Function : Author

D. Malyshev

Function : Author
PersonId : 766851
ORCID : 0000-0001-9689-2194

M. Marelli

Function : Author

M. Mayer

Function : Author

M. N. Mazziotta

Function : Author

J. Mehault

Function : Author

Laboratoire Univers et Particules de Montpellier

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

Function : Author
PersonId : 755279
ORCID : 0000-0002-2830-0502

M. Pesce-Rollins

Function : Author
PersonId : 760585
ORCID : 0000-0003-1790-8018

M. Pierbattista

Function : Author

Astrophysique Interprétation Modélisation

F. Piron

Function : Author
PersonId : 172749
IdHAL : frederic-piron
ORCID : 0000-0001-6885-7156

Laboratoire Univers et Particules de Montpellier

G. Pivato

Function : Author

T.A. Porter

Function : Author

R. Rando

Function : Author

M. Razzano

Function : Author

T. Reposeur

Function : Author
PersonId : 738492
IdHAL : thierry-reposeur
ORCID : 0000-0001-6939-3429
IdRef : 139970665

FERMI

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

V. Vasileiou

Function : Author

Laboratoire Univers et Particules de Montpellier

C. Venter

Function : Author
PersonId : 755527
ORCID : 0000-0002-2666-4812

G. Vianello

Function : Author

V. Vitale

Function : Author
PersonId : 760184
ORCID : 0000-0001-8040-7852

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.

Keywords

gamma rays: stars pulsars: individual (PSR J2021+4026) stars: neutron

Domains

High Energy Astrophysical Phenomena [astro-ph.HE] High Energy Astrophysical Phenomena [astro-ph.HE]

Nathalie Martin : Connect in order to contact the contributor

https://in2p3.hal.science/in2p3-00915598

Submitted on : Monday, December 9, 2013-9:25:45 AM

Last modification on : Tuesday, December 3, 2024-10:22:03 AM

Dates and versions

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

Identifiers

HAL Id : in2p3-00915598 , version 1
ARXIV : 1308.0358
DOI : 10.1088/2041-8205/777/1/L2

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

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