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Discovery of VHE gamma-ray emission from the direction of the globular cluster Terzan 5

Abstract : Globular clusters are old stellar systems which exhibit very-high stellar densities in their cores. The globular cluster Terzan 5 is characterized by a high stellar encounter rate and hosts the largest detected population of millisecond pulsars. It also features bright GeV gamma-ray emission and extended X-ray radiation. However, no globular clusters have been detected in very-high-energy gamma rays (VHE, E> 100 GeV) so far. In order to investigate this possibility Terzan 5 has been observed with the H.E.S.S. telescope array in this energy band. The discovery of a source of VHE gamma rays from the direction of this globular cluster will be reported. The results of the VHE analysis and a multi-wavelength view of Terzan 5 will be presented in this contribution. No counterpart or model can fully explain the observed morphology of the detected VHE gamma-ray source.
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http://hal.in2p3.fr/in2p3-00909708
Contributor : Claudine Bombar <>
Submitted on : Tuesday, November 26, 2013 - 4:52:09 PM
Last modification on : Wednesday, July 22, 2020 - 9:54:07 AM

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  • HAL Id : in2p3-00909708, version 1
  • ARXIV : 1112.4974

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W. Domainko, A. -C. Clapson, F. Brun, P. Eger, M. Jamrozy, et al.. Discovery of VHE gamma-ray emission from the direction of the globular cluster Terzan 5. 32nd International Cosmic Ray Conference (ICRC2011), Aug 2011, Beijing, China. ⟨in2p3-00909708⟩

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