2015A&A...577A.131H

Query : 2015A&A...577A.131H

2015A&A...577A.131H - Astronomy and Astrophysics, volume 577A, 131-131 (2015/5-1)

Discovery of variable VHE γ-ray emission from the binary system 1FGL J1018.6-5856.

HESS COLLABORATION, ABRAMOWSKI A., AHARONIAN F., AIT BENKHALI F., AKHPERJANIAN A.G., ANGUENER E.O., BACKES M., BALZER A., BECHERINI Y., BECKER TJUS J., BERGE D., BERNHARD S., BERNLOEHR K., BIRSIN E., BLACKWELL R., BOETTCHER M., BOISSON C., BOLMONT J., BORDAS P., BREGEON J., BRUN F., BRUN P., BRYAN M., BULIK T., CARR J., CASANOVA S., CHAKRABORTY N., CHALME-CALVET R., CHAVES R.C.G., CHEN A., CHRETIEN M., COLAFRANCESCO S., COLOGNA G., CONRAD J., COUTURIER C., CUI Y., DAVIDS I.D., DEGRANGE B., DEIL C., DEWILT P., DJANNATI-ATAIE A., DOMAINKO W., DONATH A., DRURY L.O'C., DUBUS G., DUTSON K., DYKS J., DYRDA M., EDWARDS T., EGBERTS K., EGER P., ERNENWEIN J.-P., ESPIGAT P., FARNIER C., FEGAN S., FEINSTEIN F., FERNANDES M.V., FERNANDEZ D., FIASSON A., FONTAINE G., FOERSTER A., FUESSLING M., GABICI S., GAJDUS M., GALLANT Y.A., GARRIGOUX T., GIAVITTO G., GIEBELS B., GLICENSTEIN J.F., GOTTSCHALL D., GOYAL A., GRONDIN M.-H., GRUDZINSKA M., HADASCH D., HAEFFNER S., HAHN J., HAWKES J., HEINZELMANN G., HENRI G., HERMANN G., HERVET O., HILLERT A., HINTON J.A., HOFMANN W., HOFVERBERG P., HOISCHEN C., HOLLER M., HORNS D., IVASCENKO A., JACHOLKOWSKA A., JAHN C., JAMROZY M., JANIAK M., JANKOWSKY F., JUNG-RICHARDT I., KASTENDIECK M.A., KATARZYNSKI K., KATZ U., KERSZBERG D., KHELIFI B., KIEFFER M., KLEPSER S., KLOCHKOV D., KLUZNIAK W., KOLITZUS D., KOMIN NU., KOSACK K., KRAKAU S., KRAYZEL F., KRUEGER P.P., LAFFON H., LAMANNA G., LAU J., LEFAUCHEUR J., LEFRANC V., LEMIERE A., LEMOINE-GOUMARD M., LENAIN J.-P., LOHSE T., LOPATIN A., LU C.-C., LUI R., MARANDON V., MARCOWITH A., MARIAUD C., MARX R., MAURIN G., MAXTED N., MAYER M., MEINTJES P.J., MENZLER U., MEYER M., MITCHELL A.M.W., MODERSKI R., MOHAMED M., MORA K., MOULIN E., MURACH T., DE NAUROIS M., NIEMIEC J., OAKES L., ODAKA H., OETTL S., OHM S., DE ONA WILHELMI E., OPITZ B., OSTROWSKI M., OYA I., PANTER M., PARSONS R.D., PAZ ARRIBAS M., PEKEUR N.W., PELLETIER G., PETRUCCI P.-O., PEYAUD B., PITA S., POON H., PROKOPH H., PUEHLHOFER G., PUNCH M., QUIRRENBACH A., RAAB S., REICHARDT I., REIMER A., REIMER O., RENAUD M., DE LOS REYES R., RIEGER F., ROMOLI C., ROSIER-LEES S., ROWELL G., RUDAK B., RULTEN C.B., SAHAKIAN V., SALEK D., SANCHEZ D.A., SANTANGELO A., SASAKI M., SCHLICKEISER R., SCHUESSLER F., SCHULZ A., SCHWANKE U., SCHWEMMER S., SEYFFERT A.S., SIMONI R., SOL H., SPANIER F., SPENGLER G., SPIES F., STAWARZ L., STEENKAMP R., STEGMANN C., STINZING F., STYCZ K., SUSHCH I., TAVERNET J.-P., TAVERNIER T., TAYLOR A.M., TERRIER R., TLUCZYKONT M., TRICHARD C., VALERIUS K., VAN DER WALT J., VAN ELDIK C., VAN SOELEN B., VASILEIADIS G., VEH J., VENTER C., VIANA A., VINCENT P., VINK J., VOISIN F., VOELK H.J., VUILLAUME T., WAGNER S.J., WAGNER P., WAGNER R.M., WEIDINGER M., WEITZEL Q., WHITE R., WIERZCHOLSKA A., WILLMANN P., WOERNLEIN A., WOUTERS D., YANG R., ZABALZA V., ZABOROV D., ZACHARIAS M., ZDZIARSKI A.A., ZECH A., ZEFI F. and ZYWUCKA N.

Abstract (from CDS):

Re-observations with the HESS telescope array of the very high-energy (VHE) source HESSJ1018-589A that is coincident with the Fermi-LAT γ-ray binary 1FGLJ1018.6-5856 have resulted in a source detection significance of more than 9σ and the detection of variability (χ²/ν of 238.3/155) in the emitted γ-ray flux. This variability confirms the association of HESSJ1018-589A with the high-energy γ-ray binary detected by Fermi-LAT and also confirms the point-like source as a new VHE binary system. The spectrum of HESSJ1018-589A is best fit with a power-law function with photon index Γ=2.20±0.14_stat±0.2_sys. Emission is detected up to ∼20TeV. The mean differential flux level is (2.9±0.4)x10^–13TeV^–1/cm2/s at 1TeV, equivalent to ∼1% of the flux from the Crab Nebula at the same energy. Variability is clearly detected in the night-by-night light curve. When folded on the orbital period of 16.58 days, the rebinned light curve peaks in phase with the observed X-ray and high-energy phaseograms. The fit of the HESS phaseogram to a constant flux provides evidence of periodicity at the level of N_σ>3σ. The shape of the VHE phaseogram and measured spectrum suggest a low-inclination, low-eccentricity system with a modest impact from VHE γ-ray absorption due to pair production (τ≲1 at 300GeV).

Abstract Copyright: ∼

Journal keyword(s): gamma rays: stars - stars: individual: 1FGL J1018.6-5856 - radiation mechanisms: non-thermal - acceleration of particles - X-rays: binaries

Simbad objects: 11

Full paper

View the references in ADS

Number of rows : 11

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2023	#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	822	2
2	M 1	SNR	05 34 30.9	+22 00 53						~	6031	1
3	HD 259440	HXB	06 32 59.2566076656	+05 48 01.160755848	9.17	9.63	9.15			B0pe	211	0
4	NAME Car Arm	PoG	10 00	-60.0						~	423	1
5	PSR J1016-58	Psr	10 16 21.266	-58 57 11.70						~	107	3
6	HESS J1018-589	gam	10 18	-58.9						~	22	0
7	SNR G284.3-01.8	Rad	10 18.3	-59 00						~	109	2
8	2FGL J1019.0-5856	HXB	10 18 58.0	-58 56 36						O6V((f))	117	0
9	CPD-63 2495	HXB	13 02 47.6544015048	-63 50 08.626970292	10.34	10.72	9.98	10.03		O9.5Ve	753	0
10	V* V479 Sct	HXB	18 26 15.0561548880	-14 50 54.247274304	12.02	12.23	11.27	11.04		ON6V((f))z	549	2
11	HD 226868	HXB	19 58 21.6757355952	+35 12 05.784512688	9.38	9.72	8.91	8.42		O9.7Iabpvar	4206	0

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