2018A&A...612A..11H

Query : 2018A&A...612A..11H

2018A&A...612A..11H - Astronomy and Astrophysics, volume 612A, 11-11 (2018/4-1)

Extended VHE γ-ray emission towards SGR1806-20, LBV 1806-20, and stellar cluster Cl* 1806-20.

HESS COLLABORATION, ABDALLA H., ABRAMOWSKI A., AHARONIAN F., AIT BENKHALI F., AKHPERJANIAN A.G., ANGUNER E.O., ARRIETA M., AUBERT P., BACKES M., BALZER A., BARNARD M., BECHERINI Y., BECKER TJUS J., BERGE D., BERNHARD S., BERNLOHR K., BIRSIN E., BLACKWELL R., BOTTCHER M., BOISSON C., BOLMONT J., BORDAS P., BREGEON J., BRUN F., BRUN P., BRYAN M., BULIK T., CAPASSO M., CARR J., CASANOVA S., CHAKRABORTY N., CHALME-CALVET R., CHAVES R.C.G., CHEN A., CHEVALIER J., CHRETIEN M., COLAFRANCESCO S., COLOGNA G., CONDON B., CONRAD J., COUTURIER C., CUI Y., DAVIDS I.D., DEGRANGE B., DEIL C., DEWILT P., DJANNATI-ATAI A., DOMAINKO W., DONATH A., DRURY L.O., DUBUS G., DUTSON K., DYKS J., DYRDA M., EDWARDS T., EGBERTS K., EGER P., ERNENWEIN J.-P., ESCHBACH S., FARNIER C., FEGAN S., FERNANDES M.V., FIASSON A., FONTAINE G., FORSTER A., FUNK S., FUSSLING 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., HAHN J., HAWKES J., HEINZELMANN G., HENRI G., HERMANN G., HERVET O., HILLERT A., HINTON J.A., HOFMANN W., HOISCHEN C., HOLLER M., HORNS D., IVASCENKO A., JACHOLKOWSKA A., JAMROZY M., JANIAK M., JANKOWSKY D., JANKOWSKY F., JINGO M., JOGLER T., JOUVIN L., JUNG-RICHARDT I., KASTENDIECK M.A., KATARZYNSKI K., KATZ U., KERSZBERG D., KHELIFI B., KIEFFER M., KING J., KLEPSER S., KLOCHKOV D., KLUZNIAK W., KOLITZUS D., KOMIN N., KOSACK K., KRAKAU S., KRAUS M., KRAYZEL F., KRUGER P.P., LAFFON H., LAMANNA G., LAU J., LEES J.-P., LEFAUCHEUR J., LEFRANC V., LEMIERE A., LEMOINE-GOUMARD M., LENAIN J.-P., LESER E., LOHSE T., LORENTZ M., LIU R., LYPOVA I., 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., NIEDERWANGER F., NIEMIEC J., OAKES L., ODAKA H., OTTL S., OHM S., OSTROWSKI M., OYA I., PADOVANI M., PANTER M., PARSONS R.D., PAZ ARRIBAS M., PEKEUR N.W., PELLETIER G., PETRUCCI P.-O., PEYAUD B., PITA S., POON H., PROKHOROV D., PROKOPH H., PUHLHOFER G., PUNCH M., QUIRRENBACH A., RAAB S., REIMER A., REIMER O., RENAUD M., DE 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., SCHUSSLER F., SCHULZ A., SCHWANKE U., SCHWEMMER S., SEYFFERT A.S., SHAFI N., SHILON I., 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., TUFFS R., VAN DER WALT J., VAN ELDIK C., VAN SOELEN B., VASILEIADIS G., VEH J., VENTER C., VIANA A., VINCENT P., VINK J., VOISIN F., VOLK H.J., VUILLAUME T., WADIASINGH Z., WAGNER S.J., WAGNER P., WAGNER R.M., WHITE R., WIERZCHOLSKA A., WILLMANN P., WORNLEIN A., WOUTERS D., YANG R., ZABALZA V., ZABOROV D., ZACHARIAS M., ZDZIARSKI A.A., ZECH A., ZEFI F., ZIEGLER A. and ZYWUCKA N.

Abstract (from CDS):

Using the High Energy Spectroscopic System (H.E.S.S.) telescopes we have discovered a steady and extended very high-energy (VHE) γ-ray source towards the luminous blue variable candidate LBV 1806-20, massive stellar cluster Cl* 1806-20, and magnetar SGR 1806-20. The new VHE source, HESS J1808-204, was detected at a statistical significance of >6σ (post-trial) with a photon flux normalisation (2.9±0.4stat±0.5sys)x10–13ph/cm2/s/TeV at 1TeV and a power-law photon index of 2.3±0.2stat±0.3sys. The luminosity of this source (0.2 to 10 TeV; scaled to distance d=8.7kpc) is LVHE∼1.6x1034(d/8.7kpc)2erg/s. The VHE γ-ray emission is extended and is well fit by a single Gaussian with statistical standard deviation of 0.095°±0.015°. This extension is similar to that of the synchrotron radio nebula G10.0-0.3, which is thought to be powered by LBV 1806-20. The VHE γ-ray luminosity could be provided by the stellar wind luminosity of LBV 1806-20 by itself and/or the massive star members of Cl* 1806-20. Alternatively, magnetic dissipation (e.g. via reconnection) from SGR 1806-20 can potentially account for the VHE luminosity. The origin and hadronic and/or leptonic nature of the accelerated particles responsible for HESS J1808-204 is not yet clear. If associated with SGR 1806-20, the potentially young age of the magnetar (650yr) can be used to infer the transport limits of these particles to match the VHE source size. This discovery provides new interest in the potential for high-energy particle acceleration from magnetars, massive stars, and/or stellar clusters.

Abstract Copyright: © ESO 2018

Journal keyword(s): gamma rays: general - stars: magnetars - stars: massive

CDS comments: Sgr 1806-20 cluster = [BDB2003] G010.00-00.24

Simbad objects: 25

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Number of rows : 25
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 Cl Westerlund 2 OpC 10 23 58.1 -57 45 49           ~ 356 0
2 * eta Car Em* 10 45 03.545808 -59 41 03.95124 6.37 7.03 6.48 6.123 4.41 LBV 2437 0
3 Cl Westerlund 1 Cl* 16 47 02.4 -45 51 07           ~ 566 0
4 Cl* Westerlund 1 W 243 s*b 16 47 07.5040736160 -45 52 29.123491188   19.873 15.730     LBV 61 0
5 PSR J1647-4552 Psr 16 47 10.18 -45 52 16.7           ~ 198 1
6 HESS J1741-302 gam 17 41 15.79827 -30 22 37.2040           ~ 28 0
7 [B61] 2 s*b 17 41 35.4358256400 -30 06 38.782127520   18.0 15.00 14.23 10.30 LBV_B[e]: 45 0
8 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14407 0
9 [FMM95] 3 s*b 17 46 15.240 -28 50 03.58           LBV 148 1
10 [GMC99] D6 s*b 17 46 17.982 -28 49 03.46           LBV 62 0
11 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 2265 1
12 1AGLR J1807-2103 gam 18 03 52.1 -21 10 54           ~ 72 0
13 Fermi J1808.2-2029 gam 18 08 00.0 -20 24 00           ~ 15 0
14 NAME 1806-20 Star Cluster OpC 18 08 39.0 -20 24 39           ~ 35 1
15 AX J1808.6-2024 ISM 18 08 39 -20 24.6           ~ 130 3
16 [CWD97] MC+73 MoC 18 08 39.32 -20 24 39.5           ~ 5 0
17 [CWD97] MC+44 MoC 18 08 39.32 -20 24 39.5           ~ 5 0
18 [CWD97] MC+13A MoC 18 08 39.32 -20 24 39.5           ~ 3 0
19 PSR J1808-2024 Psr 18 08 39.32 -20 24 40.1           ~ 1240 2
20 [KMN95] Star A s*b 18 08 40.312 -20 24 41.14           LBV 42 3
21 RAFGL 2078 HII 18 09 25.9 -20 19 25           ~ 80 1
22 W 31 SFR 18 10 28.6 -19 55 51           ~ 260 0
23 TeV J2032+4130 gam 20 31.7 +41 31           ~ 136 0
24 Schulte 12 s*b 20 32 40.9572199728 +41 14 29.279036940 16.1 14.45 11.702     B3-4Ia+ 424 0
25 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 943 0

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