Detection of High-Energy Gamma-Ray Emission from the Globular Cluster 47 Tucanae with Fermi

We report the detection of gamma-ray emissions above 200 megaelectron volts at a significance level of 17σ 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...

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Veröffentlicht in:	Science (American Association for the Advancement of Science) 2009-08, Vol.325 (5942), p.845-848
Hauptverfasser:	Abdo, A.A, Ajello, M, Atwood, W.B, Baldini, L, Baughman, B.M, Bechtol, K, Blandford, R.D, Bloom, E.D, Bonamente, E, Borgland, A.W, Bregeon, J, Brez, A, Brigida, M, Burnett, T.H, Caliandro, G.A, Caraveo, P.A, Casandjian, J.M, Cecchi, C, Charles, E, Chaty, S, Cheung, C.C, Ciprini, S, Claus, R, Cutini, S, Dermer, C.D, de Palma, F, Digel, S.W, do Couto e Silva, E, Dumora, D, Frailis, M, Gehrels, N, Germani, S, Giebels, B, Giglietto, N, Giordano, F, Glanzman, T, Grove, J.E, Guillemot, L, Guiriec, S, Hanabata, Y, Harding, A.K, Horan, D, Hughes, R.E, Jóhannesson, G, Johnson, A.S, Johnson, R.P, Johnson, T.J, Kamae, T, Katagiri, H, Kawai, N, Knödlseder, J, Kuehn, F, Kuss, M, Latronico, L, Lemoine-Goumard, M, Loparco, F, Lott, B, Lovellette, M.N, Makeev, A, Mazziotta, M.N, Meurer, C, Michelson, P.F, Mitthumsiri, W, Moiseev, A.A, Monzani, M.E, Morselli, A, Murgia, S, Nuss, E, Ohsugi, T, Omodei, N, Ormes, J.F, Panetta, J.H, Pelassa, V, Pierbattista, M, Razzano, M, Rea, N, Reimer, O, Reposeur, T, Rochester, L.S, Rodriguez, A.Y, Romani, R.W, Roth, M, Ryde, F, Sadrozinski, H.F.-W, Smith, D.A, Spandre, G, Starck, J.-L, Strickman, M.S, Tajima, H, Thayer, J.B, Thayer, J.G, Tibaldo, L, Torres, D.F, Tramacere, A, Uchiyama, Y, Usher, T.L, Vasileiou, V, Vilchez, N, Winer, B.L, Wood, K.S
Format:	Artikel
Sprache:	eng
Schlagworte:	area Astronomical objects Astronomy Astrophysics binaries core Earth, ocean, space Electrons Exact sciences and technology Fysik Gamma ray astronomy Gamma ray sources Gamma rays Gamma-ray sources gamma-ray bursts Globular star clusters globular-cluster-47 tucanae High Energy Astrophysical Phenomena Luminosity millisecond pulsars Photons Physics Positrons Pulsars Sciences of the Universe Space telescopes Stars & galaxies Stellar systems. Galactic and extragalactic objects and systems. The universe telescope Unidentified sources and radiation outside the solar system x-ray
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Zusammenfassung:	We report the detection of gamma-ray emissions above 200 megaelectron volts at a significance level of 17σ 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.
ISSN:	0036-8075 1095-9203 1095-9203
DOI:	10.1126/science.1177023