2009ApJ...700.1059A

Query : 2009ApJ...700.1059A

2009ApJ...700.1059A - Astrophys. J., 700, 1059-1066 (2009/August-1)

Pulsed gamma-rays from PSR J2021+3651 with the Fermi Large Area Telescope.

ABDO A.A., ACKERMANN M., AJELLO M., ATWOOD W.B., BALDINI L., BALLET J., BARBIELLINI G., BASTIERI D., BATTELINO M., BAUGHMAN B.M., BECHTOL K., BELLAZZINI R., BERENJI B., BLOOM E.D., BOGAERT G., BORGLAND A.W., BREGEON J., BREZ A., BRIGIDA M., BRUEL P., BURNETT T.H., CALIANDRO G.A., CAMERON R.A., CAMILO F., CARAVEO P.A., CASANDJIAN J.M., CECCHI C., CHARLES E., CHEKHTMAN A., CHEN A.W., CHEUNG C.C., CHIANG J., CIPRINI S., COGNARD I., COHEN-TANUGI J., COMINSKY L.R., CONRAD J., CUTINI S., DEMOREST P., DERMER C.D., DE ANGELIS A., DE LUCA A., DE PALMA F., DIGEL S.W., DORMODY M., DO COUTO E SILVA E., DRELL P.S., DUBOIS R., DUMORA D., ESPINOZA C., FARNIER C., FAVUZZI C., FOCKE W.B., FRAILIS M., FREIRE P.C.C., FUKAZAWA Y., FUNK S., FUSCO P., GARGANO F., GASPARRINI D., GEHRELS N., GERMANI S., GIEBELS B., GIGLIETTO N., GIORDANO F., GLANZMAN T., GODFREY G., GRENIER I.A., GRONDIN M.-H., GROVE J.E., GUILLEMOT L., GUIRIEC S., HANABATA Y., HARDING A.K., HAYASHIDA M., HAYS E., HUGHES R.E., JOHANNESSON G., JOHNSON A.S., JOHNSON R.P., JOHNSON T.J., JOHNSON W.N., JOHNSTON S., KAMAE T., KATAGIRI H., KATAOKA J., KAWAI N., KERR M., KIZILTAN B., KNODLSEDER J., KOMIN N., KRAMER M., KUEHN F., KUSS M., LANDE J., LATRONICO L., LEE S.-H., LEMOINE-GOUMARD M., LONGO F., LOPARCO F., LOTT B., LOVELLETTE M.N., LUBRANO P., LYNE A.G., MAKEEV A., MANCHESTER R.N., MARELLI M., MAZZIOTTA M.N., McCONVILLE W., McENERY J.E., McLAUGHLIN M.A., MEURER C., MICHELSON P.F., MITTHUMSIRI W., MIZUNO T., MOISEEV A.A., MONTE C., MONZANI M.E., MORSELLI A., MOSKALENKO I.V., MURGIA S., NOLAN P.L., NOUTSOS A., NUSS E., OHSUGI T., OMODEI N., ORLANDO E., ORMES J.F., OZAKI M., PANEQUE D., PANETTA J.H., PARENT D., PEPE M., PESCE-ROLLINS M., PIRON F., PORTER T.A., RAINO S., RANDO R., RANSOM S.M., RAZZANO M., REIMER A., REIMER O., REPOSEUR T., RITZ S., ROCHESTER L.S., RODRIGUEZ A.Y., ROMANI R.W., RYDE F., SADROZINSKI H.F.-W., SANCHEZ D., SAZ PARKINSON P.M., SGRO C., SIERPOWSKA-BARTOSIK A., SISKIND E.J., SMITH D.A., SMITH P.D., SPANDRE G., SPINELLI P., STAPPERS B.W., STARCK J.-L., STRICKMAN M.S., SUSON D.J., TAJIMA H., TAKAHASHI H., TAKAHASHI T., TANAKA T., THAYER J.B., THAYER J.G., THEUREAU G., THOMPSON D.J., THORSETT S.E., TIBALDO L., TORRES D.F., TOSTI G., TRAMACERE A., UCHIYAMA Y., USHER T.L., VAN ETTEN A., VILCHEZ N., VITALE V., WAITE A.P., WALLACE E., WATTERS K., WELTEVREDE P., WOOD K.S., YLINEN T. and ZIEGLER M.

Abstract (from CDS):

We report the detection of pulsed gamma-rays from the young, spin-powered radio pulsar PSR J2021+3651 using data acquired with the Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope (formerly GLAST). The light curve consists of two narrow peaks of similar amplitude separated by 0.468 ±0.002 in phase. The first peak lags the maximum of the 2 GHz radio pulse by 0.162±0.004±0.01 in phase. The integral gamma-ray photon flux above 100 MeV is (56±3±11)x10–8/cm2/s. The photon spectrum is well described by an exponentially cut-off power law of the form, where the energy E is expressed in GeV. The photon index is Γ = 1.5±0.1±0.1 and the exponential cut-off is Ec= 2.4±0.3±0.5 GeV. The first uncertainty is statistical and the second is systematic. The integral photon flux of the bridge is approximately 10% of the pulsed emission, and the upper limit on off-pulse gamma-ray emission from a putative pulsar wind nebula is < 10% of the pulsed emission at the 95% confidence level. Radio polarization measurements yield a rotation measure of RM = 524±4 rad/m2 but a poorly constrained magnetic geometry. Re-analysis of Chandra X-ray Observatory data enhanced the significance of the weak X-ray pulsations, and the first peak is roughly phase aligned with the first gamma-ray peak. We discuss the emission region and beaming geometry based on the shape and spectrum of the gamma-ray light curve combined with radio and X-ray measurements, and the implications for the pulsar distance. Gamma-ray emission from the polar cap region seems unlikely for this pulsar.

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Journal keyword(s): gamma rays: observations - pulsars: general - pulsars: individual: PSR J2021+3651

Simbad objects: 12

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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 SNR G119.5+10.2 SNR 00 06.6 +72 47           ~ 268 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 NAME Vela Pulsar Psr 08 35 20.65525 -45 10 35.1545     15.10     ~ 2446 1
5 QSO B1445+101 Bla 14 45 16.46525080 +09 58 36.0727447   18.58 17.78     ~ 408 2
6 QSO J2015+371 BLL 20 15 28.72978661 +37 10 59.5147372     21.82 21.4   ~ 324 2
7 PSR J2021+3651 Psr 20 21 05.40 +36 51 04.5           ~ 218 1
8 GRO J2019+40 gam 20 21.5 +40 26           ~ 131 1
9 PSR J2021+4026 Psr 20 21 30.496 +40 26 53.56           ~ 300 2
10 Cl Berkeley 87 OpC 20 21 35.0 +37 25 14           ~ 141 0
11 GRO J2021+37 gam 20 22 37.2 +37 16 53           ~ 94 2
12 NAME Cyg Complex reg 20 32 +45.0           ~ 667 0

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