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


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.26CET06:19:52

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±0.14stat±0.2sys. 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 Nσ>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

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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 - 2020
#notes
1 LS I +61 303 HXB 02 40 31.6641883136 +61 13 45.591138110 11.27 11.61 10.75 10.19 9.55 B0Ve 753 2
2 M 1 SNR 05 34 31.94 +22 00 52.2           ~ 5520 4
3 HD 259440 HXB 06 32 59.2566624297 +05 48 01.162565528 9.17 9.58 9.12     B0pe 181 0
4 NAME Car Arm PoG 10 00 -60.0           ~ 371 1
5 PSR J1016-58 Psr 10 16 21.266 -58 57 11.70           ~ 82 3
6 HESS J1018-589 gam 10 18 -58.9           ~ 17 0
7 SNR G284.3-01.8 Rad 10 18.3 -59 00           ~ 100 2
8 3FHL J1018.8-5857 HXB 10 19 02.270 -58 56 29.87           ~ 89 0
9 CPD-63 2495 HXB 13 02 47.6541729595 -63 50 08.625922862 10.34 10.72 9.98 10.03   O9.5Ve 661 1
10 V* V479 Sct HXB 18 26 15.0561532140 -14 50 54.249464136 12.02 12.23 11.27 11.04   ON6V((f))z 487 2
11 HD 226868 HXB 19 58 21.6758193269 +35 12 05.782512305 9.38 9.72 8.91 8.42   O9.7Iabpvar 3868 0

    Equat.    Gal    SGal    Ecl

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2020.01.26-06:19:52

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