PSR J2021+4026 in the Gamma Cygni Region: The First Variable y-Ray Pulsar Seen by the Fermi Lat

Baring, M.G.; Allafort, A.; Baldini, L.; Ballet, J.; Barbiellini, 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.; Chekhtman, A.; Chiang, J.; Chiaro, G.; Ciprini, S.; Claus, R.; D'Ammando, F.; de Palma, F.; Digel, S.W.; Di Venere, L.; Drell, P.S.; Favuzzi, C.; Ferrara, E.C.; Franckowiak, A.; Fusco, P.; Gargano, F.; Gasparrini, D.; Giglietto, N.; Giroletti, M.; Glanzman, T.; Godfrey, G.; Grenier, I.A.; Guiriec, S.; Hadasch, D.; Harding, A.K.; Hayashida, M.; Hayashi, K.; Hays, E.; Hewitt, J.; Hill, A.B.; Horan, D.; Hou, X.; Jogler, T.; Johnson, A.S.; Johnson, T.J.; Kerr, M.; Knödlseder, J.; Kuss, M.; Lande, J.; Larsson, S.; Latronico, L.; Lemoine-Goumard, M.; Loparco, F.; Lubrano, P.; Malyshev, D.; Marelli, M.; Mayer, M.; Mazziotta, M.N.; Mehault, J.; Mizuno, T.; Monzani, M.E.; 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, T.A.; Rainò, S.; Rando, R.; Ray, P.S.; Razzano, M.; Reimer, O.; Reposeur, T.; Romani, R.W.; Sartori, A.; Saz Parkinson, P.M.; Sgrò, C.; Siskind, E.J.; Smith, D.A.; Spinelli, P.; Strong, A.W.; Takahashi, H.; Thayer, J.B.; Thompson, D.J.; Tibaldo, L.; Tinivella, M.; Torres, D.F.; Tosti, G.; Uchiyama, Y.; Usher, T.L.; Vandenbroucke, J.; Vasileiou, V.; Venter, C.; Vianello, G.; Vitale, V.; Winer, B.L.; Wood, K.S.

PSR J2021+4026 in the Gamma Cygni Region: The First Variable y-Ray Pulsar Seen by the Fermi Lat

dc.citation.issueNumber	L2	en_US
dc.citation.journalTitle	The Astrophysical Journal Letters	en_US
dc.citation.volumeNumber	777	en_US
dc.contributor.author	Baring, M.G.	en_US
dc.contributor.author	Allafort, A.	en_US
dc.contributor.author	Baldini, L.	en_US
dc.contributor.author	Ballet, J.	en_US
dc.contributor.author	Barbiellini, G.	en_US
dc.contributor.author	Bastieri, D.	en_US
dc.contributor.author	Bellazzini, R.	en_US
dc.contributor.author	Bonamente, E.	en_US
dc.contributor.author	Bottacini, E.	en_US
dc.contributor.author	Brandt, T.J.	en_US
dc.contributor.author	Bregeon, J.	en_US
dc.contributor.author	Bruel, P.	en_US
dc.contributor.author	Buehler, R.	en_US
dc.contributor.author	Buson, S.	en_US
dc.contributor.author	Caliandro, G.A.	en_US
dc.contributor.author	Cameron, R.A.	en_US
dc.contributor.author	Caraveo, P.A.	en_US
dc.contributor.author	Cecchi, C.	en_US
dc.contributor.author	Chaves, R.C.G.	en_US
dc.contributor.author	Chekhtman, A.	en_US
dc.contributor.author	Chiang, J.	en_US
dc.contributor.author	Chiaro, G.	en_US
dc.contributor.author	Ciprini, S.	en_US
dc.contributor.author	Claus, R.	en_US
dc.contributor.author	D'Ammando, F.	en_US
dc.contributor.author	de Palma, F.	en_US
dc.contributor.author	Digel, S.W.	en_US
dc.contributor.author	Di Venere, L.	en_US
dc.contributor.author	Drell, P.S.	en_US
dc.contributor.author	Favuzzi, C.	en_US
dc.contributor.author	Ferrara, E.C.	en_US
dc.contributor.author	Franckowiak, A.	en_US
dc.contributor.author	Fusco, P.	en_US
dc.contributor.author	Gargano, F.	en_US
dc.contributor.author	Gasparrini, D.	en_US
dc.contributor.author	Giglietto, N.	en_US
dc.contributor.author	Giroletti, M.	en_US
dc.contributor.author	Glanzman, T.	en_US
dc.contributor.author	Godfrey, G.	en_US
dc.contributor.author	Grenier, I.A.	en_US
dc.contributor.author	Guiriec, S.	en_US
dc.contributor.author	Hadasch, D.	en_US
dc.contributor.author	Harding, A.K.	en_US
dc.contributor.author	Hayashida, M.	en_US
dc.contributor.author	Hayashi, K.	en_US
dc.contributor.author	Hays, E.	en_US
dc.contributor.author	Hewitt, J.	en_US
dc.contributor.author	Hill, A.B.	en_US
dc.contributor.author	Horan, D.	en_US
dc.contributor.author	Hou, X.	en_US
dc.contributor.author	Jogler, T.	en_US
dc.contributor.author	Johnson, A.S.	en_US
dc.contributor.author	Johnson, T.J.	en_US
dc.contributor.author	Kerr, M.	en_US
dc.contributor.author	Knödlseder, J.	en_US
dc.contributor.author	Kuss, M.	en_US
dc.contributor.author	Lande, J.	en_US
dc.contributor.author	Larsson, S.	en_US
dc.contributor.author	Latronico, L.	en_US
dc.contributor.author	Lemoine-Goumard, M.	en_US
dc.contributor.author	Lande, J.	en_US
dc.contributor.author	Loparco, F.	en_US
dc.contributor.author	Lubrano, P.	en_US
dc.contributor.author	Malyshev, D.	en_US
dc.contributor.author	Marelli, M.	en_US
dc.contributor.author	Mayer, M.	en_US
dc.contributor.author	Mazziotta, M.N.	en_US
dc.contributor.author	Mehault, J.	en_US
dc.contributor.author	Mizuno, T.	en_US
dc.contributor.author	Monzani, M.E.	en_US
dc.contributor.author	Morselli, A.	en_US
dc.contributor.author	Murgia, S.	en_US
dc.contributor.author	Nemmen, R.	en_US
dc.contributor.author	Nuss, E.	en_US
dc.contributor.author	Ohsugi, T.	en_US
dc.contributor.author	Omodei, N.	en_US
dc.contributor.author	Orienti, M.	en_US
dc.contributor.author	Orlando, E.	en_US
dc.contributor.author	Paneque, D.	en_US
dc.contributor.author	Pesce-Rollins, M.	en_US
dc.contributor.author	Pierbattista, M.	en_US
dc.contributor.author	Piron, F.	en_US
dc.contributor.author	Pivato, G.	en_US
dc.contributor.author	Porter, T.A.	en_US
dc.contributor.author	Rainò, S.	en_US
dc.contributor.author	Rando, R.	en_US
dc.contributor.author	Ray, P.S.	en_US
dc.contributor.author	Razzano, M.	en_US
dc.contributor.author	Reimer, O.	en_US
dc.contributor.author	Reposeur, T.	en_US
dc.contributor.author	Romani, R.W.	en_US
dc.contributor.author	Sartori, A.	en_US
dc.contributor.author	Saz Parkinson, P.M.	en_US
dc.contributor.author	Sgrò, C.	en_US
dc.contributor.author	Siskind, E.J.	en_US
dc.contributor.author	Smith, D.A.	en_US
dc.contributor.author	Spinelli, P.	en_US
dc.contributor.author	Strong, A.W.	en_US
dc.contributor.author	Takahashi, H.	en_US
dc.contributor.author	Thayer, J.B.	en_US
dc.contributor.author	Thompson, D.J.	en_US
dc.contributor.author	Tibaldo, L.	en_US
dc.contributor.author	Tinivella, M.	en_US
dc.contributor.author	Torres, D.F.	en_US
dc.contributor.author	Tosti, G.	en_US
dc.contributor.author	Uchiyama, Y.	en_US
dc.contributor.author	Usher, T.L.	en_US
dc.contributor.author	Vandenbroucke, J.	en_US
dc.contributor.author	Vasileiou, V.	en_US
dc.contributor.author	Venter, C.	en_US
dc.contributor.author	Vianello, G.	en_US
dc.contributor.author	Vitale, V.	en_US
dc.contributor.author	Winer, B.L.	en_US
dc.contributor.author	Wood, K.S.	en_US
dc.date.accessioned	2013-10-18T17:28:13Z	en_US
dc.date.available	2014-04-19T05:10:04Z	en_US
dc.date.issued	2013	en_US
dc.description.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.	en_US
dc.embargo.terms	6 months	en_US
dc.identifier.citation	Baring, M.G., Allafort, A., Baldini, L., et al.. "PSR J2021+4026 in the Gamma Cygni Region: The First Variable y-Ray Pulsar Seen by the Fermi Lat." <i>The Astrophysical Journal Letters,</i> 777, no. L2 (2013) The American Astronomical Society: http://dx.doi.org/10.1088/2041-8205/777/1/L2.	en_US
dc.identifier.doi	http://dx.doi.org/10.1088/2041-8205/777/1/L2	en_US
dc.identifier.uri	https://hdl.handle.net/1911/72217	en_US
dc.language.iso	eng	en_US
dc.publisher	The American Astronomical Society	en_US
dc.rights	Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.	en_US
dc.subject.keyword	gamma rays	en_US
dc.subject.keyword	stars – pulsars	en_US
dc.subject.keyword	individual (PSR J2021+4026) – stars	en_US
dc.subject.keyword	neutron	en_US
dc.title	PSR J2021+4026 in the Gamma Cygni Region: The First Variable y-Ray Pulsar Seen by the Fermi Lat	en_US
dc.type	Journal article	en_US
dc.type.dcmi	Text	en_US
dc.type.publication	publisher version	en_US

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