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

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dc.contributor.author Venter, Christo
dc.contributor.author Vorster, Michael Johannes
dc.contributor.author Büsching, Ingo
dc.contributor.author De Jager, Ocker Cornelis
dc.date.accessioned 2012-09-05T10:12:14Z
dc.date.available 2012-09-05T10:12:14Z
dc.date.issued 2011
dc.identifier.citation Büsching, I. et al. 2011. Very-high-energy gamma-ray emission from the direction of the galactic globular cluster Terzan 5. Astronomy & astrophysics, 531(L18):1-5. [ http://www.aanda.org] en_US
dc.identifier.issn 0004-6361
dc.identifier.issn 1432-0746 (Online)
dc.identifier.uri http://hdl.handle.net/10394/7237
dc.description.abstract The HESS very-high-energy (VHE, E > 0.1 TeV) gamma-ray telescope system has discovered a new source, HESS J1747-248. The measured integral flux is (1.2 ± 0.3) × 10−12 cm−2 s−1 above 440 GeV 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. en_US
dc.description.uri http://dx.doi.org/10.1051/0004-6361/201117171
dc.description.uri http://www.aanda.org/index.php?option=com_article&access=standard&Itemid=129&url=/articles/aa/abs/2011/04/aa15381-10/aa15381-10.html
dc.language.iso en en_US
dc.publisher EDP Sciences en_US
dc.subject Globular clusters: individual: Terzan 5 en_US
dc.subject radiation mechanisms: non-thermal en_US
dc.subject pulsars: general en_US
dc.subject gamma rays: general en_US
dc.title Very-high-energy gamma-ray emission from the direction of the galactic globular cluster Terzan 5 en_US
dc.type Article en_US


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