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dc.contributor.authorVenter, Christo
dc.contributor.authorVorster, Michael Johannes
dc.contributor.authorBüsching, Ingo
dc.contributor.authorDe Jager, Ocker Cornelis
dc.date.accessioned2012-09-05T10:12:14Z
dc.date.available2012-09-05T10:12:14Z
dc.date.issued2011
dc.identifier.citationBüsching, 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.issn0004-6361
dc.identifier.issn1432-0746 (Online)
dc.identifier.urihttp://hdl.handle.net/10394/7237
dc.description.abstractThe 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.urihttp://dx.doi.org/10.1051/0004-6361/201117171
dc.description.urihttp://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.isoenen_US
dc.publisherEDP Sciencesen_US
dc.subjectGlobular clusters: individual: Terzan 5en_US
dc.subjectradiation mechanisms: non-thermalen_US
dc.subjectpulsars: generalen_US
dc.subjectgamma rays: generalen_US
dc.titleVery-high-energy gamma-ray emission from the direction of the galactic globular cluster Terzan 5en_US
dc.typeArticleen_US


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