Search for cosmic-ray induced gamma-ray emission in Galaxy Clusters
- Ackermann, M.
- Ajello, M.
- Albert, A.
- Allafort, A.
- Atwood, W.B.
- Baldini, L.
- Ballet, J.
- Barbiellini, G.
- Bastieri, D.
- Bechtol, K.
- Bellazzini, R.
- Bloom, E.D.
- Bonamente, E.
- Bottacini, E.
- Brandt, T.J.
- Bregeon, J.
- Brigida, M.
- Bruel, P.
- Buehler, R.
- Buson, S.
- Caliandro, G.A.
- Cameron, R.A.
- Caraveo, P.A.
- Cavazzuti, E.
- Chaves, R.C.G.
- Chiang, J.
- Chiaro, G.
- Ciprini, S.
- Claus, R.
- Cohen-Tanugi, Johann
- Conrad, J.
- d'Ammando, F.
- de Angelis, A.
- Palma, F.De
- Dermer, C.D.
- Digel, S.W.
- Drell, P.S.
- Drlica-Wagner, A.
- Favuzzi, C.
- Franckowiak, A.
- Funk, S.
- Fusco, P.
- Gargano, F.
- Gasparrini, D.
- Germani, S.
- Giglietto, N.
- Giordano, F.
- Giroletti, M.
- Godfrey, G.
- Gomez-Vargas, G.A.
- Grenier, I.A.
- Guiriec, S.
- Gustafsson, M.
- Hadasch, D.
- Hayashida, M.
- Hewitt, J.
- Hughes, R.E.
- Jeltema, T.E.
- Jóhannesson, G.
- Johnson, A.S.
- Kamae, T.
- Kataoka, J.
- Knödlseder, J.
- Kuss, M.
- Lande, J.
- Larsson, S.
- Latronico, L.
- Garde, M.Llena
- Longo, F.
- Loparco, F.
- Lovellette, M.N.
- Lubrano, P.
- Mayer, M.
- Mazziotta, M.N.
- Mcenery, J.E.
- Michelson, P.F.
- Mitthumsiri, W.
- Mizuno, T.
- Monzani, M.E.
- Morselli, A.
- Moskalenko, I.V.
- Murgia, S.
- Nemmen, R.
- Nuss, E.
- Ohsugi, T.
- Orienti, M.
- Orlando, E.
- Ormes, J.F.
- Perkins, J.S.
- Pesce-Rollins, M.
- Piron, F.
- Pivato, G.
- Rainò, S.
- Rando, R.
- Razzano, M.
- Razzaque, S.
- Reimer, A.
- Reimer, O.
- Ruan, J.
- Sánchez-Conde, M.
- Schulz, A.
- Sgrò, C.
- Siskind, E.J.
- Spandre, G.
- Spinelli, P.
- Storm, E.
- Strong, A.W.
- Suson, D.J.
- Takahashi, H.
- Thayer, J.G.
- Thayer, J.B.
- Thompson, D.J.
- Tibaldo, L.
- Tinivella, M.
- Torres, D.F.
- Troja, E.
- Uchiyama, Y.
- Usher, T.L.
- Vandenbroucke, J.
- Vianello, G.
- Vitale, V.
- Winer, B.L.
- Wood, K.S.
- Zimmer, S.
- Pinzke, A.
- Pfrommer, C.
DOIAbstract
International audienceCurrent theories predict relativistic hadronic particle populations in clusters of galaxies in addition to the already observed relativistic leptons. In these scenarios hadronic interactions give rise to neutral pions which decay into γ rays that are potentially observable with the Large Area Telescope (LAT) on board the Fermi space telescope. We present a joint likelihood analysis searching for spatially extended γ-ray emission at the locations of 50 galaxy clusters in four years of Fermi-LAT data under the assumption of the universal cosmic-ray (CR) model proposed by Pinzke & Pfrommer. We find an excess at a significance of 2.7σ, which upon closer inspection, however, is correlated to individual excess emission towar...
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