ALLAFORT, A.; BALDINI, Luca; BALLET, Jean; BARBIELLINI, Guido; BASTIERI, D.; BELLAZZINI, R.; BONAMENTE, E.; BOTTACINI, E.; J. BRANDT, T.; BREGEON, J.; BRUEL, Pascal; BUEHLER, R.; A. CALIANDRO, G.; A. CAMERON, R.; CARAVEO, P. A.; CECCHI, C.; CHAVES, R.C.G.; CHEKHTMAN, A.; CHIARO, G.; CLAUS, R.; D'AMMANDO, F.; DE PALMA, F.; DI VENERE, L.; S. DRELL, P.; FAVUZZI, C.; C. FERRARA, E.; FRANCKOWIAK, A.; GARGANO, F.; GASPARRINI, D.; GIGLIETTO, N.; GIROLETTI, M.; GLANZMAN, T.; GODFREY, G.; GUIRIEC, S.; HADASCH, D.; K. HARDING, A.; HAYASHIDA, M.; HAYASHI, K.; HAYS, E.; HEWITT, J.; HORAN, D.; JOGLER, T.; KERR, M.; KNÖDLSEDER, Jürgen; LANDE, J.; LARSSON, S.; LATRONICO, L.; LEMOINE-GOUMARD, M.; LONGO, F.; LOPARCO, F.; LUBRANO, P.; MALYSHEV, D.; MARELLI, M.; MAYER, M.; N. MAZZIOTTA, M.; MEHAULT, J.; MIZUNO, T.; E. MONZANI, M.; MORSELLI, A.; MURGIA, S.; OMODEI, N.; ORIENTI, M.; ORLANDO, E.; PANEQUE, D.; PESCE-ROLLINS, M.; PIERBATTISTA, M.; PIRON, F.; PIVATO, G.; PORTER, T.A.; RANDO, R.; RAZZANO, M.; REPOSEUR, T.; SARTORI, A.; M. SAZ PARKINSON, P.; SGRO, C.; SPINELLI, P.; W. STRONG, A.; TAKAHASHI, H.; B. THAYER, J.; J. THOMPSON, D.; TIBALDO, L.; TINIVELLA, M.; F. TORRES, D.; TOSTI, G.; UCHIYAMA, Y.; L. USHER, T.; VANDENBROUCKE, J.; VASILEIOU, V.; VENTER, C.; VIANELLO, G.; VITALE, V.; L. WINER, B.; S. WOOD, K.

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

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ALLAFORT, A.

BALDINI, Luca

BALLET, Jean
Astrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)]

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The Astrophysical journal letters. 2013, vol. 777, p. L2

Bristol : IOP Publishing

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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.< Réduire

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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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