2013ApJ...777L...2A

Query : 2013ApJ...777L...2A

2013ApJ...777L...2A - Astrophys. J., 777, L2 (2013/November-1)

PSR J2021+4026 in the gamma Cygni region: the first variable γ-ray pulsar seen by the Fermi LAT.

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., 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., KNODLSEDER 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 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., RAINO S., RANDO R., RAY P.S., RAZZANO M., REIMER O., REPOSEUR T., ROMANI R.W., SARTORI A., SAZ PARKINSON P.M., SGRO 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. and WOOD K.S.

Abstract (from CDS):

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)x10–10 erg/cm2/s to (6.86±0.13)x10–10 erg/cm2/s. Simultaneously, the frequency spindown rate increased from (7.8±0.1)x10–13 Hz/s to (8.1±0.1) x10–13 Hz/s. 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.

Abstract Copyright: ∼

Journal keyword(s): gamma rays: stars - pulsars: individual: PSR J2021+4026 - stars: neutron

Simbad objects: 12

goto Full paper

goto View the references in ADS

Number of rows : 12
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 M 1 SNR 05 34 31.8 +22 01 03           ~ 6516 1
2 PSR J0633+1746 Psr 06 33 54.153 +17 46 12.91           ~ 1308 0
3 NAME Vela SNR 08 34.0 -45 50           ~ 1331 2
4 PSR J1836+5925 Psr 18 36 13.661 +59 25 29.77           ~ 153 0
5 NAME gam Cyg SNR SNR 20 20 17.100 +40 26 09.00           ~ 247 2
6 PSR J2021+3651 Psr 20 21 05.40 +36 51 04.5           ~ 218 1
7 GRO J2019+40 gam 20 21.5 +40 26           ~ 131 1
8 PSR J2021+4026 Psr 20 21 30.496 +40 26 53.56           ~ 300 2
9 [WRR2011] 20 X 20 21 30.733 +40 26 46.04           ~ 2 1
10 * gam Cyg V* 20 22 13.7018357 +40 15 24.044963 3.44 2.90 2.23 1.74 1.40 F8Ib 607 0
11 NAME Cyg X Cld 20 30 04.7973633 +40 51 36.002197           ~ 962 1
12 NAME Cyg Complex reg 20 32 +45.0           ~ 667 0

To bookmark this query, right click on this link: simbad:objects in 2013ApJ...777L...2A and select 'bookmark this link' or equivalent in the popup menu