2012A&A...541A...5H

Query : 2012A&A...541A...5H

2012A&A...541A...5H - Astronomy and Astrophysics, volume 541A5-5 (2012/5-1)

Discovery of VHE emission towards the Carina Arm region. with the H.E.S.S. telescope array: HESS J1018-589.

HESS COLLABORATION, ABRAMOWSKI A., ACERO F., AHARONIAN F., AKHPERJANIAN A.G., ANTON G., BALZER A., BARNACKA A., BECHERINI Y., BECKER J., BERNLOEHR K., BIRSIN E., BITEAU J., BOCHOW A., BOISSON C., BOLMONT J., BORDAS P., BRUCKER J., BRUN F., BRUN P., BULIK T., BUESCHING I., CARRIGAN S., CASANOVA S., CERRUTI M., CHADWICK P.M., CHARBONNIER A., CHAVES R.C.G., CHEESEBROUGH A., COLOGNA G., CONRAD J., DALTON M., DANIEL M.K., DAVIDS I.D., DEGRANGE B., DEIL C., DICKINSON H.J., DJANNATI-ATAIE A., DOMAINKO W., DRURY L.O'C., DUBUS G., DUTSON K., DYKS J., DYRDA M., EGBERTS K., EGER P., ESPIGAT P., FALLON L., FEGAN S., FEINSTEIN F., FERNANDES M.V., FIASSON A., FONTAINE G., FOERSTER A., FUESSLING M., GALLANT Y.A., GAST H., GERARD L., GERBIG D., GIEBELS B., GLICENSTEIN J.F., GLUECK B., GOERING D., HAEFFNER S., HAGUE J.D., HAHN J., HAMPF D., HARRIS J., HAUSER M., HEINZ S., HEINZELMANN G., HENRI G., HERMANN G., HILLERT A., HINTON J.A., HOFMANN W., HOFVERBERG P., HOLLER M., HORNS D., JACHOLKOWSKA A., DE JAGER O.C., JAHN C., JAMROZY M., JUNG I., KASTENDIECK M.A., KATARZYNSKI K., KATZ U., KAUFMANN S., KEOGH D., KHELIFI B., KLOCHKOV D., KLUZNIAK W., KNEISKE T., KOMIN NU., KOSACK K., KOSSAKOWSKI R., KRAYZEL F., LAFFON H., LAMANNA G., LENAIN J.-P., LENNARZ D., LOHSE T., LOPATIN A., LU C.-C., MARANDON V., MARCOWITH A., MASBOU J., MAXTED N., MAYER M., McCOMB T.J.L., MEDINA M.C., MEHAULT J., MODERSKI R., MOHAMED M., MOULIN E., NAUMANN C.L., NAUMANN-GODO M., DE NAUROIS M., NEDBAL D., NEKRASSOV D., NGUYEN N., NICHOLAS B., NIEMIEC J., NOLAN S.J., OHM S., DE ONA WILHELMI E., OPITZ B., OSTROWSKI M., OYA I., PANTER M., PAZ ARRIBAS M., PEKEUR N.W., PELLETIER G., PEREZ J., PETRUCCI P.-O., PEYAUD B., PITA S., PUEHLHOFER G., PUNCH M., QUIRRENBACH A., RAUE M., RAYNER S.M., REIMER A., REIMER O., RENAUD M., DE LOS REYES R., RIEGER F., RIPKEN J., ROB L., ROSIER-LEES S., ROWELL G., RUDAK B., RULTEN C.B., SAHAKIAN V., SANCHEZ D.A., SANTANGELO A., SCHLICKEISER R., SCHULZ A., SCHWANKE U., SCHWARZBURG S., SCHWEMMER S., SHEIDAEI F., SKILTON J.L., SOL H., SPENGLER G., STAWARZ L., STEENKAMP R., STEGMANN C., STINZING F., STYCZ K., SUSHCH I., SZOSTEK A., TAVERNET J.-P., TERRIER R., TLUCZYKONT M., VALERIUS K., VAN ELDIK C., VASILEIADIS G., VENTER C., VIANA A., VINCENT P., VOELK H.J., VOLPE F., VOROBIOV S., VORSTER M., WAGNER S.J., WARD M., WHITE R., WIERZCHOLSKA A., ZACHARIAS M., ZAJCZYK A., ZDZIARSKI A.A., ZECH A. and ZECHLIN H.-S.

Abstract (from CDS):

The Carina arm region, containing the supernova remnant SNR G284.3-1.8, the high-energy (HE; E>100MeV) binary 1FGLJ1018.6-5856 and the energetic pulsar PSRJ1016-5857 and its nebula, has been observed with the H.E.S.S. telescope array. The observational coverage of the region in very-high-energy (VHE; E>0.1TeV) γ-rays benefits from deep exposure (40h) of the neighboring open cluster Westerlund 2. The observations have revealed a new extended region of VHE γ-ray emission. The new VHE source HESSJ1018-589 shows a bright, point-like emission region positionally coincident with SNR G284.3-1.8 and 1FGLJ1018.6-5856 and a diffuse extension towards the direction of PSRJ1016-5857. A soft (Γ=2.7±0.5stat) photonindex, with a differential flux at 1TeV of N0=(4.2 ±1.1)x10–13/TeV/cm2/s is found for the point-like source, whereas the total emission region including the diffuse emission region is well fit by a power-law function with spectral index Γ=2.9±0.4_ stat_ and differential flux at 1TeV of N0 =(6.8±1.6)x10–13/TeV/cm2/s. This H.E.S.S. detection motivated follow-up X-ray observations with the XMM-Newton satellite to investigate the origin of the VHE emission. The analysis of the XMM-Newton data resulted in the discovery of a bright, non-thermal point-like source (XMMU J101855.4-58564) with a photon index of Γ=1.65±0.08 in the center of SNR G284.3-1.8, and a thermal, extended emission region coincident with its bright northern filament. The characteristics of this thermal emission are used to estimate the plasma density in the region as n ≃0.5cm–3(2.9kpc/d)2. The position of XMMUJ101855.4-58564 is compatible with the position reported by the Fermi-LAT collaboration for the binary system 1FGLJ1018.6-5856 and the variable Swift XRT source identified with it. The new X-ray data are used alongside archival multi-wavelength data to investigate the relationship between the VHE γ-ray emission from HESSJ1018-589 and the various potential counterparts in the Carina arm region.

Abstract Copyright: ∼

Journal keyword(s): gamma rays: stars - ISM: individual objects: SNR G284.3-1.8 - ISM: individual objects: 1FGL J1018.6-5856 - ISM: individual objects: PSRJ1016-5857

Simbad objects: 15

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Number of rows : 15
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 M 1 SNR 05 34 31.8 +22 01 03           ~ 6516 1
2 NAME Vela X Psr 08 33 08.880 -45 11 24.36           ~ 302 1
3 NAME Car Arm PoG 10 00 -60.0           ~ 471 1
4 PSR J1016-58 Psr 10 16 21.266 -58 57 11.70           ~ 129 3
5 HESS J1018-589 gam 10 18 -58.9           ~ 23 0
6 SNR G284.3-01.8 SNR 10 18.3 -59 00           ~ 123 2
7 1FGL J1018.6-5856 HXB 10 18 55.5875706288 -58 56 45.975246900   13.638 12.683     O6V((f)) 156 0
8 Cl Westerlund 2 OpC 10 23 58.1 -57 45 49           ~ 400 0
9 PSR J1028-5819 Psr 10 28 27.888 -58 19 06.14           ~ 122 1
10 CPD-63 2495 HXB 13 02 47.6544015048 -63 50 08.626970292 10.34 10.72 9.98 10.03   O9.5Ve 852 0
11 NAME Lupus SN SNR 15 02 22.1 -42 05 49           ~ 1407 1
12 SNR G347.3-00.5 SNR 17 12 27 -39 41.2     12.27     ~ 761 1
13 SNR G006.4-00.1 SNR 18 00 31.2011719 -23 25 48.001099           ~ 782 1
14 PSR B1823-13 Psr 18 26 13.06 -13 34 48.1           ~ 460 1
15 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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