2011A&A...531L..18A

Query : 2011A&A...531L..18A

2011A&A...531L..18A - Astronomy and Astrophysics, volume 531, L18-18 (2011/7-1)

Very-high-energy gamma-ray emission from the direction of the galactic globular cluster Terzan 5.

ABRAMOWSKI A., ACERO F., AHARONIAN F., AKHPERJANIAN A.G., ANTON G., BALZER A., BARNACKA A., BARRES DE ALMEIDA U., BECHERINI Y., BECKER J., BEHERA B., BERNLOEHR K., 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., CHOUNET L.-M., CLAPSON A.C., COIGNET G., 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., DUBOIS F., DUBUS G., DUTSON K., DYKS J., DYRDA M., EGBERTS K., EGER P., ESPIGAT P., FALLON L., FARNIER C., 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., GORET P., GOERING D., HAEFFNER S., HAGUE J.D., HAMPF D., HAUSER M., HEINZ S., HEINZELMANN G., HENRI G., HERMANN G., HINTON J.A., HOFFMANN 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., KHANGULYAN D., KHELIFI B., KLOCHKOV D., KLUZNIAK W., KNEISKE T., KOMIN N., KOSACK K., KOSSAKOWSKI R., LAFFON H., LAMANNA G., LENNARZ D., LOHSE T., LOPATIN A., LU C.-C., MARANDON V., MARCOWITH A., MASBOU J., MAURIN D., MAXTED N., McCOMB T.J.L., MEDINA M.C., MEHAULT J., NGUYEN N., MODERSKI R., MOULIN E., NAUMANN C.L., NAUMANN-GODO M., DE NAUROIS M., NEDBAL D., NEKRASSOV D., NICHOLAS B., NIEMIEC J., NOLAN S.J., OHM S., DE ONA WILHELMI E., OPITZ B., OSTROWSKI M., OYA I., PANTER M., PAZ ARRIBAS M., PEDALETTI G., PELLETIER G., PETRUCCI P.-O., 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., RUPPEL J., RYDE F., SAHAKIAN V., SANTANGELO A., SCHLICKEISER R., SCHOECK F.M., SCHULZ A., SCHWANKE U., SCHWARZBURG S., SCHWEMMER S., SIKORA M., 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., VIALLE J.P., 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., ZECHLIN H.-S. (The HESS Collaboration)

Abstract (from CDS):

The HESS very-high-energy (VHE, E>0.1TeV) gamma-ray telescope system has discovered a new source, HESS J1747-248. The measured integral flux is (1.2±0.3)x10–12/cm2/s above 440GeV for a power-law photon spectral index of 2.5±0.3stat±0.2sys. The VHE gamma-ray source is located in the close vicinity of the Galactic globular cluster Terzan 5 and extends beyond the HESS point spread function (0.07°). The probability of a chance coincidence with Terzan 5 and an unrelated VHE source is quite low (∼10–4). With the largest population of identified millisecond pulsars (msPSRs), a very high core stellar density and the brightest GeV range flux as measured by Fermi-LAT, Terzan 5 stands out among Galactic globular clusters. The properties of the VHE source are briefly discussed in the context of potential emission mechanisms, notably in relation to msPSRs. Interpretation of the available data accommodates several possible origins for this VHE gamma-ray source, although none of them offers a satisfying explanation of its peculiar morphology.

Abstract Copyright: ∼

Journal keyword(s): globular clusters: individual: Terzan 5 - radiation mechanisms: non-thermal - pulsars: general - gamma rays: general

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 - 2024 		#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 3934 0
2 M 1 SNR 05 34 30.9 +22 00 53           ~ 6215 1
3 V* CM Tau Psr 05 34 31.9474694616 +22 00 52.153698024           ~ 5272 0
4 PSR J1124-5916 Psr 11 24 39.1 -59 16 20           ~ 165 1
5 NAME Lupus SN SNR 15 02 22.1 -42 05 49           ~ 1333 1
6 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 1987 0
7 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2200 0
8 NGC 6388 GlC 17 36 17.461 -44 44 08.34           ~ 926 1
9 HESS J1747-248 gam 17 47 49.0 -24 48 30           ~ 6 0
10 Cl Terzan 5 Cl* 17 48 05.00 -24 46 48.0           ~ 857 1
11 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3150 0

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