PSR J2021+4026 in the gamma cygni region: The first variable γ-ray pulsar seen by the fermi lat

A. Allafort; L. Baldini; J. Ballet; G. Barbiellini; M. G. Baring; D. Bastieri; R. Bellazzini; E. Bonamente; E. Bottacini; T. J. Brandt; J. Bregeon; P. Bruel; R. Buehler; S. Buson; G. A. Caliandro; R. A. Cameron; P. A. Caraveo; C. Cecchi; R. C.G. Chaves; A. Chekhtman; J. Chiang; G. Chiaro; S. Ciprini; R. Claus; F. D'Ammando; F. De Palma; S. W. Digel; L. Di Venere; P. S. Drell; C. Favuzzi; E. C. Ferrara; A. Franckowiak; P. Fusco; F. Gargano; D. Gasparrini; N. Giglietto; M. Giroletti; T. Glanzman; G. Godfrey; I. A. Grenier; S. Guiriec; D. Hadasch; A. K. Harding; M. Hayashida; K. Hayashi; E. Hays; J. Hewitt; A. B. Hill; D. Horan; X. Hou; T. Jogler; A. S. Johnson; T. J. Johnson; M. Kerr; J. Knödlseder; M. Kuss; 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; R. Nemmen; E. Nuss; T. Ohsugi; N. Omodei; M. Orienti; E. Orlando; D. Paneque; M. Pesce-Rollins; M. Pierbattista; F. Piron; G. Pivato; T. A. Porter; S. Rainò; R. Rando; P. S. Ray; M. Razzano; O. Reimer; T. Reposeur; R. W. Romani; A. Sartori; P. M. Saz Parkinson; C. Sgrò; E. J. Siskind; D. A. Smith; 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

PSR J2021+4026 in the gamma cygni region: The first variable γ-ray pulsar seen by the fermi lat

A. Allafort
, L. Baldini
, J. Ballet
, G. Barbiellini
, M. G. Baring
, D. Bastieri
, R. Bellazzini
, E. Bonamente
, E. Bottacini
, T. J. Brandt
, J. Bregeon
, P. Bruel
, R. Buehler
, S. Buson
, G. A. Caliandro
, R. A. Cameron
, P. A. Caraveo
, C. Cecchi
, R. C.G. Chaves
, A. Chekhtman

J. Chiang, G. Chiaro, S. Ciprini, R. Claus, F. D'Ammando, F. De Palma, S. W. Digel, L. Di Venere, P. S. Drell, C. Favuzzi, E. C. Ferrara, A. Franckowiak, P. Fusco, F. Gargano, D. Gasparrini, N. Giglietto, M. Giroletti, T. Glanzman, G. Godfrey, I. A. Grenier, S. Guiriec, D. Hadasch, A. K. Harding, M. Hayashida, K. Hayashi, E. Hays, J. Hewitt, A. B. Hill, D. Horan, X. Hou, T. Jogler, A. S. Johnson, T. J. Johnson, M. Kerr, J. Knödlseder, M. Kuss, 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, R. Nemmen, E. Nuss, T. Ohsugi, N. Omodei, M. Orienti, E. Orlando, D. Paneque, M. Pesce-Rollins, M. Pierbattista, F. Piron, G. Pivato, T. A. Porter, S. Rainò, R. Rando, P. S. Ray, M. Razzano, O. Reimer, T. Reposeur, R. W. Romani, A. Sartori, P. M. Saz Parkinson, C. Sgrò, E. J. Siskind, D. A. Smith, 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

Kavli Institute for Particle Astrophysics and Cosmology
University of Pisa
Universite Paris-Saclay
INFN Sezione di Trieste
University of Trieste
Rice University
INFN
University of Padova
Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
INFN Sezione di Perugia
University of Perugia
NASA Goddard Space Flight Center
c/o DESY
University of Sheffield
INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Milan
George Mason University
Science and Research Directorate
Osservatorio Astronomico di Roma
INAF Istituto di Radioastronomia
Politecnico di Bari
INFN Sezione di Bari
University of Tokyo
ISAS/JAXA
University of Southampton
Université Paris-Sud
Naval Research Laboratory
IRAP/CNRS
Stockholm University
Oskar Klein Centre
INFN Sezione di Torino
Hiroshima University
INFN Roma Tor Vergata
Laboratoire Univers et Particules de Montpellier
Max-Planck-Institut für Physik
University of Innsbruck
University of California at Santa Cruz
NYCB Real-Time Computing Inc.
Max Planck Institut für Extraterrestrische Physik
Pompeu Fabra University (UPF)
not available
North-West University
Consorzio Interuniversitario per la Fisica Spaziale (CIFS)
University of Rome “Tor Vergata”
The Ohio State University

Research output: Contribution to journal › Article › peer-review

88 Citations (Scopus)

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.

Original language	English
Article number	L2
Journal	Astrophysical Journal Letters
Volume	777
Issue number	1
DOIs	https://doi.org/10.1088/2041-8205/777/1/L2
Publication status	Published - 1 Nov 2013

Keywords

gamma rays: stars
stars: neutron

Access to Document

10.1088/2041-8205/777/1/L2

Cite this

Allafort, A., Baldini, L., Ballet, J., Barbiellini, G., Baring, M. G., Bastieri, D., Bellazzini, R., Bonamente, E., Bottacini, E., Brandt, T. J., Bregeon, J., Bruel, P., Buehler, R., Buson, S., Caliandro, G. A., Cameron, R. A., Caraveo, P. A., Cecchi, C., Chaves, R. C. G., ... Wood, K. S. (2013). PSR J2021+4026 in the gamma cygni region: The first variable γ-ray pulsar seen by the fermi lat. Astrophysical Journal Letters, 777(1), Article L2. https://doi.org/10.1088/2041-8205/777/1/L2

@article{13e3fb8dcd264cfeb2c8f79adf175031,

title = "PSR J2021+4026 in the gamma cygni region: The first variable γ-ray pulsar seen by the fermi lat",

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) {\texttimes} 10-10 erg cm-2 s-1 to (6.86 ± 0.13) {\texttimes} 10-10 erg cm-2 s-1. Simultaneously, the frequency spindown rate increased from (7.8 ± 0.1) {\texttimes} 10-13 Hz s-1 to (8.1 ± 0.1) {\texttimes} 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, stars: neutron",

author = "A. Allafort and L. Baldini and J. Ballet and G. Barbiellini and Baring, \{M. G.\} and D. Bastieri and R. Bellazzini and E. Bonamente and E. Bottacini and Brandt, \{T. J.\} and J. Bregeon and P. Bruel and R. Buehler and S. Buson and Caliandro, \{G. A.\} and Cameron, \{R. A.\} and Caraveo, \{P. A.\} and C. Cecchi and Chaves, \{R. C.G.\} and A. Chekhtman and J. Chiang and G. Chiaro and S. Ciprini and R. Claus and F. D'Ammando and \{De Palma\}, F. and Digel, \{S. W.\} and \{Di Venere\}, L. and Drell, \{P. S.\} and C. Favuzzi and Ferrara, \{E. C.\} and A. Franckowiak and P. Fusco and F. Gargano and D. Gasparrini and N. Giglietto and M. Giroletti and T. Glanzman and G. Godfrey and Grenier, \{I. A.\} and S. Guiriec and D. Hadasch and Harding, \{A. K.\} and M. Hayashida and K. Hayashi and E. Hays and J. Hewitt and Hill, \{A. B.\} and D. Horan and X. Hou and T. Jogler and Johnson, \{A. S.\} and Johnson, \{T. J.\} and M. Kerr and J. Kn{\"o}dlseder and M. Kuss and J. Lande and S. Larsson and L. Latronico and M. Lemoine-Goumard and F. Longo and F. Loparco and P. Lubrano and D. Malyshev and M. Marelli and M. Mayer and Mazziotta, \{M. N.\} and J. Mehault and T. Mizuno and Monzani, \{M. E.\} and A. Morselli and S. Murgia and R. Nemmen and E. Nuss and T. Ohsugi and N. Omodei and M. Orienti and E. Orlando and D. Paneque and M. Pesce-Rollins and M. Pierbattista and F. Piron and G. Pivato and Porter, \{T. A.\} and S. Rain{\`o} and R. Rando and Ray, \{P. S.\} and M. Razzano and O. Reimer and T. Reposeur and Romani, \{R. W.\} and A. Sartori and \{Saz Parkinson\}, \{P. M.\} and C. Sgr{\`o} and Siskind, \{E. J.\} and Smith, \{D. A.\} and P. Spinelli and Strong, \{A. W.\} and H. Takahashi and Thayer, \{J. B.\} and Thompson, \{D. J.\} and L. Tibaldo and M. Tinivella and Torres, \{D. F.\} and G. Tosti and Y. Uchiyama and Usher, \{T. L.\} and J. Vandenbroucke and V. Vasileiou and C. Venter and G. Vianello and V. Vitale and Winer, \{B. L.\} and Wood, \{K. S.\}",

year = "2013",

month = nov,

day = "1",

doi = "10.1088/2041-8205/777/1/L2",

language = "English",

volume = "777",

journal = "Astrophysical Journal Letters",

issn = "2041-8205",

publisher = "American Astronomical Society",

number = "1",

}

Allafort, A, Baldini, L, Ballet, J, Barbiellini, G, Baring, MG, Bastieri, D, Bellazzini, R, Bonamente, E, Bottacini, E, Brandt, TJ, Bregeon, J, Bruel, P, Buehler, R, Buson, S, Caliandro, GA, Cameron, RA, Caraveo, PA, Cecchi, C, Chaves, RCG, Chekhtman, A, Chiang, J, Chiaro, G, Ciprini, S, Claus, R, D'Ammando, F, De Palma, F, Digel, SW, Di Venere, L, Drell, PS, Favuzzi, C, Ferrara, EC, Franckowiak, A, Fusco, P, Gargano, F, Gasparrini, D, Giglietto, N, Giroletti, M, Glanzman, T, Godfrey, G, Grenier, IA, Guiriec, S, Hadasch, D, Harding, AK, Hayashida, M, Hayashi, K, Hays, E, Hewitt, J, Hill, AB, Horan, D, Hou, X, Jogler, T, Johnson, AS, Johnson, TJ, Kerr, M, Knödlseder, J, Kuss, M, Lande, J, Larsson, S, Latronico, L, Lemoine-Goumard, M, Longo, F, Loparco, F, Lubrano, P, Malyshev, D, Marelli, M, Mayer, M, Mazziotta, MN, Mehault, J, Mizuno, T, Monzani, ME, Morselli, A, Murgia, S, Nemmen, R, Nuss, E, Ohsugi, T, Omodei, N, Orienti, M, Orlando, E, Paneque, D, Pesce-Rollins, M, Pierbattista, M, Piron, F, Pivato, G, Porter, TA, Rainò, S, Rando, R, Ray, PS, Razzano, M, Reimer, O, Reposeur, T, Romani, RW, Sartori, A, Saz Parkinson, PM, Sgrò, C, Siskind, EJ, Smith, DA, Spinelli, P, Strong, AW, Takahashi, H, Thayer, JB, Thompson, DJ, Tibaldo, L, Tinivella, M, Torres, DF, Tosti, G, Uchiyama, Y, Usher, TL, Vandenbroucke, J, Vasileiou, V, Venter, C, Vianello, G, Vitale, V, Winer, BL & Wood, KS 2013, 'PSR J2021+4026 in the gamma cygni region: The first variable γ-ray pulsar seen by the fermi lat', Astrophysical Journal Letters, vol. 777, no. 1, L2. https://doi.org/10.1088/2041-8205/777/1/L2

TY - JOUR

T1 - PSR J2021+4026 in the gamma cygni region

T2 - The first variable γ-ray pulsar seen by the fermi lat

AU - Allafort, A.

AU - Baldini, L.

AU - Ballet, J.

AU - Barbiellini, G.

AU - Baring, M. G.

AU - Bastieri, D.

AU - Bellazzini, R.

AU - Bonamente, E.

AU - Bottacini, E.

AU - Brandt, T. J.

AU - Bregeon, J.

AU - Bruel, P.

AU - Buehler, R.

AU - Buson, S.

AU - Caliandro, G. A.

AU - Cameron, R. A.

AU - Caraveo, P. A.

AU - Cecchi, C.

AU - Chaves, R. C.G.

AU - Chekhtman, A.

AU - Chiang, J.

AU - Chiaro, G.

AU - Ciprini, S.

AU - Claus, R.

AU - D'Ammando, F.

AU - De Palma, F.

AU - Digel, S. W.

AU - Di Venere, L.

AU - Drell, P. S.

AU - Favuzzi, C.

AU - Ferrara, E. C.

AU - Franckowiak, A.

AU - Fusco, P.

AU - Gargano, F.

AU - Gasparrini, D.

AU - Giglietto, N.

AU - Giroletti, M.

AU - Glanzman, T.

AU - Godfrey, G.

AU - Grenier, I. A.

AU - Guiriec, S.

AU - Hadasch, D.

AU - Harding, A. K.

AU - Hayashida, M.

AU - Hayashi, K.

AU - Hays, E.

AU - Hewitt, J.

AU - Hill, A. B.

AU - Horan, D.

AU - Hou, X.

AU - Jogler, T.

AU - Johnson, A. S.

AU - Johnson, T. J.

AU - Kerr, M.

AU - Knödlseder, J.

AU - Kuss, M.

AU - Lande, J.

AU - Larsson, S.

AU - Latronico, L.

AU - Lemoine-Goumard, M.

AU - Longo, F.

AU - Loparco, F.

AU - Lubrano, P.

AU - Malyshev, D.

AU - Marelli, M.

AU - Mayer, M.

AU - Mazziotta, M. N.

AU - Mehault, J.

AU - Mizuno, T.

AU - Monzani, M. E.

AU - Morselli, A.

AU - Murgia, S.

AU - Nemmen, R.

AU - Nuss, E.

AU - Ohsugi, T.

AU - Omodei, N.

AU - Orienti, M.

AU - Orlando, E.

AU - Paneque, D.

AU - Pesce-Rollins, M.

AU - Pierbattista, M.

AU - Piron, F.

AU - Pivato, G.

AU - Porter, T. A.

AU - Rainò, S.

AU - Rando, R.

AU - Ray, P. S.

AU - Razzano, M.

AU - Reimer, O.

AU - Reposeur, T.

AU - Romani, R. W.

AU - Sartori, A.

AU - Saz Parkinson, P. M.

AU - Sgrò, C.

AU - Siskind, E. J.

AU - Smith, D. A.

AU - Spinelli, P.

AU - Strong, A. W.

AU - Takahashi, H.

AU - Thayer, J. B.

AU - Thompson, D. J.

AU - Tibaldo, L.

AU - Tinivella, M.

AU - Torres, D. F.

AU - Tosti, G.

AU - Uchiyama, Y.

AU - Usher, T. L.

AU - Vandenbroucke, J.

AU - Vasileiou, V.

AU - Venter, C.

AU - Vianello, G.

AU - Vitale, V.

AU - Winer, B. L.

AU - Wood, K. S.

PY - 2013/11/1

Y1 - 2013/11/1

N2 - 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.

AB - 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.

KW - gamma rays: stars

KW - stars: neutron

U2 - 10.1088/2041-8205/777/1/L2

DO - 10.1088/2041-8205/777/1/L2

M3 - Article

AN - SCOPUS:84886304568

SN - 2041-8205

VL - 777

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

IS - 1

M1 - L2

ER -

PSR J2021+4026 in the gamma cygni region: The first variable γ-ray pulsar seen by the fermi lat

Abstract

Keywords

Access to Document

Fingerprint

Cite this