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HESS upper limit on the very high energy gamma-ray emission from the globular cluster 47 Tucanae
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2009 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 499, no 1, p. 273-277Article in journal (Refereed) Published
Abstract [en]

Observations of the globular cluster 47 Tucanae (NGC 104), which contains at least 23 ms pulsars, were performed with the HESS telescope system. The observations lead to an upper limit of F(E > 800 GeV) < 6.7 x 10(-13) cm(-2) s(-1) on the integral gamma-ray photon flux from 47 Tucanae. Considering millisecond pulsars as the unique potential source of gamma-rays in the globular cluster, constraints based on emission models are derived: on the magnetic field in the average pulsar nebula and on the conversion efficiency of spin-down power to gamma-ray photons or to relativistic leptons.

Place, publisher, year, edition, pages
2009. Vol. 499, no 1, p. 273-277
Keywords [en]
Galaxy: globular clusters: individual: 47 Tucanae, stars: pulsars: general, gamma rays: observations
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Physics, Astroparticle Physics
Identifiers
URN: urn:nbn:se:lnu:diva-30266DOI: 10.1051/0004-6361/200811564ISI: 000266286600025OAI: oai:DiVA.org:lnu-30266DiVA, id: diva2:707003
Available from: 2014-03-24 Created: 2013-11-08 Last updated: 2017-12-05Bibliographically approved

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Becherini, Yvonne

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