2005A&A...442....1A

Query : 2005A&A...442....1A

2005A&A...442....1A - Astronomy and Astrophysics, volume 442, 1-10 (2005/10-4)

Discovery of the binary pulsar PSRB1259-63 in very-high-energy gamma rays around periastron with HESS.

AHARONIAN F., AKHPERJANIAN A.G., AYE K.-M., BAZER-BACHI A.R., BEILICKE M., BENBOW W., BERGE D., BERGHAUS P., BERNLOEHR K., BOISSON C., BOLZ O., BRAUN I., BREITLING F., BROWN A.M., BUSSONS GORDO J., CHADWICK P.M., CHOUNET L.-M., CORNILS R., COSTAMANTE L., DEGRANGE B., DJANNATI-ATAIE A., DRURY L.O'C., DUBUS G., EMMANOULOPOULOS D., ESPIGAT P., FEINSTEIN F., FLEURY P., FONTAINE G., FUCHS Y., FUNK S., GALLANT Y.A., GIEBELS B., GILLESSEN S., GLICENSTEIN J.F., GORET P., HADJICHRISTIDIS C., HAUSER M., HEINZELMANN G., HENRI G., HERMANN G., HINTON J.A., HOFMANN W., HOLLERAN M., HORNS D., DE JAGER O.C., JOHNSTON S., KHELIFI B., KIRK J.G., KOMIN N., KONOPELKO A., LATHAM I.J., LE GALLOU R., LEMIERE A., LEMOINE-GOUMARD M., LEROY N., MARTINEAU-HUYNH O., LOHSE T., MARCOWITH A., MASTERSON C., McCOMB T.J.L., DE NAUROIS M., NOLAN S.J., NOUTSOS A., ORFORD K.J., OSBORNE J.L., OUCHRIF M., PANTER M., PELLETIER G., PITA S., PUEHLHOFER G., PUNCH M., RAUBENHEIMER B.C., RAUE M., RAUX J., RAYNER S.M., REDONDO I., REIMER A., REIMER O., RIPKEN J., ROB L., ROLLAND L., ROWELL G., SAHAKIAN V., SAUGE L., SCHLENKER S., SCHLICKEISER R., SCHUSTER C., SCHWANKE U., SIEWERT M., SKJAERAASEN O., SOL H., STEENKAMP R., STEGMANN C., TAVERNET J.-P., TERRIER R., THEORET C.G., TLUCZYKONT M., VASILEIADIS G., VENTER C., VINCENT P., VOELK H.J. and WAGNER S.J.

Abstract (from CDS):

We report the discovery of very-high-energy (VHE) γ-ray emission of the binary system PSRB1259-63/SS2883 of a radio pulsar orbiting a massive, luminous Be star in a highly eccentric orbit. The observations around the 2004 periastron passage of the pulsar were performed with the four 13m Cherenkov telescopes of the HESS experiment, recently installed in Namibia and in full operation since December 2003. Between February and June 2004, a γ-ray signal from the binary system was detected with a total significance above 13σ. The flux was found to vary significantly on timescales of days which makes PSRB1259-63 the first variable galactic source of VHE γ-rays observed so far. Strong emission signals were observed in pre- and post-periastron phases with a flux minimum around periastron, followed by a gradual flux decrease in the months after. The measured time-averaged energy spectrum above a mean threshold energy of 380GeV can be fitted by a simple power law F₀(E/1TeV)^–Γ with a photon index Γ=2.7±0.2_stat±0.2_sys and flux normalisation F₀=(1.3±0.1_stat±0.3_sys)x10^–12TeV^–1cm^–2s^–1. This detection of VHE γ-rays provides unambiguous evidence for particle acceleration to multi-TeV energies in the binary system. In combination with coeval observations of the X-ray synchrotron emission by the RXTE and INTEGRAL instruments, and assuming the VHE γ-ray emission to be produced by the inverse Compton mechanism, the magnetic field strength can be directly estimated to be of the order of 1G.

Abstract Copyright: ∼

Journal keyword(s): gamma-rays: observations - stars: pulsars: individual: PSR B1259-63

Simbad objects: 5

Full paper

View the references in ADS

Number of rows : 5

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Sp type	#ref 1850 - 2024	#notes
1	M 1	SNR	05 34 30.9	+22 00 53					~	6120	1
2	V* CM Tau	Psr	05 34 31.9474694616	+22 00 52.153698024					~	5196	0
3	1RXP J130159.6-635806	Psr	13 01 58.7205396744	-63 58 08.828687136					O9V/B1III	57	0
4	CPD-63 2495	Psr	13 02 47.6544015048	-63 50 08.626970292	10.34	10.72	9.98	10.03	O9.5Ve	774	0
5	PSR J1301-6305	Psr	13 02 47.9992676	-63 10 48.001099					~	121	2

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