2008ApJ...679.1427A

Query : 2008ApJ...679.1427A

2008ApJ...679.1427A - Astrophys. J., 679, 1427-1432 (2008/June-1)

VERITAS observations of the γ-ray binary LS I +61 303.

ACCIARI V.A., BEILICKE M., BLAYLOCK G., BRADBURY S.M., BUCKLEY J.H., BUGAEV V., BUTT Y., BYRUM K.L., CELIK O., CESARINI A., CIUPIK L., CHOW Y.C.K., COGAN P., COLIN P., CUI W., DANIEL M.K., DUKE C., ERGIN T., FALCONE A.D., FEGAN S.J., FINLEY J.P., FORTIN P., FORTSON L.F., GALL D., GIBBS K., GILLANDERS G.H., GRUBE J., GUENETTE R., HANNA D., HAYS E., HOLDER J., HORAN D., HUGHES S.B., HUI C.M., HUMENSKY T.B., KAARET P., KIEDA D.B., KILDEA J., KONOPELKO A., KRAWCZYNSKI H., KRENNRICH F., LANG M.J., LEBOHEC S., LEE K., MAIER G., McCANN A., McCUTCHEON M., MILLIS J., MORIARTY P., MUKHERJEE R., NAGAI T., ONG R.A., PANDEL D., PERKINS J.S., PIZLO F., POHL M., QUINN J., RAGAN K., REYNOLDS P.T., ROSE H.J., SCHROEDTER M., SEMBROSKI G.H., SMITH A.W., STEELE D., SWORDY S.P., TONER J.A., VALCARCEL L., VASSILIEV V.V., WAGNER R., WAKELY S.P., WARD J.E., WEEKES T.C., WEINSTEIN A., WHITE R.J., WILLIAMS D.A., WISSEL S.A., WOOD M. and ZITZER B.

Abstract (from CDS):

LS I +61 303 is one of only a few high-mass X-ray binaries currently detected at high significance in very high energy γ-rays. The system was observed over several orbital cycles (between 2006 September and 2007 February) with the VERITAS array of imaging air Cerenkov telescopes. A signal of γ-rays with energies above 300 GeV is found with a statistical significance of 8.4 standard deviations. The detected flux is measured to be strongly variable; the maximum flux is found during most orbital cycles at apastron. The energy spectrum for the period of maximum emission can be characterized by a power law with a photon index of Γ=2.40±0.16_stat±0.2_sysand a flux above 300 GeV corresponding to 15%-20% of the flux from the Crab Nebula.

Abstract Copyright: ∼

Journal keyword(s): Acceleration of Particles - Stars: Binaries: General - Gamma Rays: Observations - stars: individual (LS I +61 303)

Simbad objects: 4

Full paper

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Number of rows : 4

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	LS I +61 303	HXB	02 40 31.6644419688	+61 13 45.593918580	11.27	11.61	10.75	10.19	9.55	B0Ve	903	2
2	M 1	SNR	05 34 31.8	+22 01 03						~	6516	1
3	CPD-63 2495	HXB	13 02 47.6544015048	-63 50 08.626970292	10.34	10.72	9.98	10.03		O9.5Ve	852	0
4	V* V479 Sct	HXB	18 26 15.0561548880	-14 50 54.247274304	12.02	12.23	11.27	11.04		ON6V((f))z	613	2

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