Journal
SCIENCE
Volume 325, Issue 5942, Pages 845-848Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1177023
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Funding
- NASA
- U.S. Department of Energy
- Commissariat a l Energie Atomique
- CNRS
- Institut National de Physique Nuclaire et de Physique des Particules
- Agenzia Spaziale Italiana and Istituto Nazionale di Fisica Nucleare
- Ministry of Education, Culture, Sports, Science and Technology
- High Energy Accelerator Research Organization (KEK)
- Japan Aerospace Exploration Agency
- K. A. Wallenberg Foundation
- Swedish Research Council
- National Space Board (Sweden)
- Istituto Nazionale di Astrofisica (Italy)
- Centre National d Etudes Spatiales (France)
- ICREA Funding Source: Custom
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We report the detection of gamma-ray emissions above 200 megaelectron volts at a significance level of 17 sigma from the globular cluster 47 Tucanae, using data obtained with the Large Area Telescope onboard the Fermi Gamma-ray Space Telescope. Globular clusters are expected to emit gamma rays because of the large populations of millisecond pulsars that they contain. The spectral shape of 47 Tucanae is consistent with gamma-ray emission from a population of millisecond pulsars. The observed gamma-ray luminosity implies an upper limit of 60 millisecond pulsars present in 47 Tucanae.
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