학술논문

Detection of High-Energy Gamma-Ray Emission from the Globular Cluster 47 Tucanae with Fermi
Document Type
research-article
Author
Abdo, A. A.Ackermann, M.Ajello, M.Atwood, W. B.Axelsson, M.Baldini, L.Ballet, J.Barbiellini, G.Bastieri, D.Baughman, B. M.Bechtol, K.Bellazzini, R.Berenji, B.Blandford, R. D.Bloom, E. D.Bonamente, E.Borgland, A. W.Bregeon, J.Brez, A.Brigida, M.Bruel, P.Burnett, T. H.Caliandro, G. A.Cameron, R. A.Caraveo, P. A.Casandjian, J. M.Cecchi, C.Çelik, Ö.Charles, E.Chaty, S.Chekhtman, A.Cheung, C. C.Chiang, J.Ciprini, S.Claus, R.Cohen-Tanugi, J.Conrad, J.Cutini, S.Dermer, C. D.de Palma, F.Digel, S. W.Dormody, M.Silva, E. do Couto eDrell, P. S.Dubois, R.Dumora, D.Farnier, C.Favuzzi, C.Fegan, S. J.Focke, W. B.Frailis, M.Fukazawa, Y.Fusco, P.Gargano, F.Gasparrini, D.Gehrels, N.Germani, S.Giebels, B.Giglietto, N.Giordano, F.Glanzman, T.Godfrey, G.Grenier, I. A.Grove, J. E.Guillemot, L.Guiriec, S.Hanabata, Y.Harding, A. K.Hayashida, M.Hays, E.Horan, D.Hughes, R. E.Jóhannesson, G.Johnson, A. S.Johnson, R. P.Johnson, T. J.Johnson, W. N.Kamae, T.Katagiri, H.Kawai, N.Kerr, M.Knödlseder, J.Kuehn, F.Kuss, M.Lande, J.Latronico, L.Lemoine-Goumard, M.Longo, F.Loparco, F.Lott, B.Lovellette, M. N.Lubrano, P.Makeev, A.Mazziotta, M. N.McConville, W.McEnery, J. E.Meurer, C.Michelson, P. F.Mitthumsiri, W.Mizuno, T.Moiseev, A. A.Monte, C.Monzani, M. E.Morselli, A.Moskalenko, I. V.Murgia, S.Nolan, P. L.Norris, J. P.Nuss, E.Ohsugi, T.Omodei, N.Orlando, E.Ormes, J. F.Paneque, D.Panetta, J. H.Parent, D.Pelassa, V.Pepe, M.Pierbattista, M.Piron, F.Porter, T. A.Rainò, S.Rando, R.Razzano, M.Rea, N.Reimer, A.Reimer, O.Reposeur, T.Ritz, S.Rochester, L. S.Rodriguez, A. Y.Romani, R. W.Roth, M.Ryde, F.Sadrozinski, H. F.-W.Sanchez, D.Sander, A.Parkinson, P. M. SazSgrò, C.Smith, D. A.Smith, P. D.Spandre, G.Spinelli, P.Starck, J.-L.Strickman, M. S.Suson, D. J.Tajima, H.Takahashi, H.Tanaka, T.Thayer, J. B.Thayer, J. G.Thompson, D. J.Tibaldo, L.Torres, D. F.Tosti, G.Tramacere, A.Uchiyama, Y.Usher, T. L.Vasileiou, V.Vilchez, N.Vitale, V.Wang, P.Webb, N.Winer, B. L.Wood, K. S.Ylinen, T.Ziegler, M.
Source
Science, 2009 Aug . 325(5942), 845-848.
Subject
Gamma rays
Pulsars
Globular star clusters
Gamma ray sources
Physics
Nazism
Photons
Astronomical objects
Luminosity
Positrons
Language
English
ISSN
00368075
10959203
Abstract
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.