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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/24915
Title: Deep observation of the NGC 1275 region with MAGIC: search of diffuse γ-ray emission from cosmic rays in the Perseus cluster
Authors: Ahnen, M. L.
Ansoldi, S.
ANTONELLI, Lucio Angelo 
Antoranz, P.
Babic, A.
Banerjee, B.
Bangale, P.
Barres de Almeida, U.
Barrio, J. A.
Becerra González, J.
Bednarek, W.
Bernardini, E.
Biasuzzi, B.
Biland, A.
Blanch, O.
Bonnefoy, S.
Bonnoli, G.
Borracci, F.
Bretz, T.
Buson, S.
Carmona, E.
Carosi, A.
Chatterjee, A.
Clavero, R.
Colin, P.
Colombo, E.
Contreras, J. L.
Cortina, J.
COVINO, Stefano 
Da Vela, P.
Dazzi, F.
De Angelis, A.
De Lotto, B.
de Oña Wilhelmi, E.
Delgado Mendez, C.
Di Pierro, F.
Domínguez, A.
Dominis Prester, D.
Dorner, D.
Doro, M.
Einecke, S.
Eisenacher Glawion, D.
Elsaesser, D.
Fernández-Barral, A.
Fidalgo, D.
Fonseca, M. V.
Font, L.
Frantzen, K.
Fruck, C.
Galindo, D.
García López, R. J.
Garczarczyk, M.
Garrido Terrats, D.
Gaug, M.
Giammaria, P.
Godinović, N.
González Muñoz, A.
Gora, D.
Guberman, D.
Hadasch, D.
Hahn, A.
Hanabata, Y.
Hayashida, M.
Herrera, J.
Hose, J.
Hrupec, D.
Hughes, G.
Idec, W.
Kodani, K.
Konno, Y.
Kubo, H.
Kushida, J.
LA BARBERA, ANTONINO 
Lelas, D.
Lindfors, E.
Lombardi, S. 
Longo, F.
López, M.
López-Coto, R.
Lorenz, E.
Majumdar, P.
Makariev, M.
Mallot, K.
Maneva, G.
Manganaro, M.
Mannheim, K.
Maraschi, L.
Marcote, B.
Mariotti, M.
Martínez, M.
Mazin, D.
Menzel, U.
Miranda, J. M.
Mirzoyan, R.
Moralejo, A.
Moretti, E.
Nakajima, D.
Neustroev, V.
Niedzwiecki, A.
Nievas Rosillo, M.
Nilsson, K.
Nishijima, K.
Noda, K.
Orito, R.
Overkemping, A.
Paiano, S.
Palacio, J.
Palatiello, M.
Paneque, D.
Paoletti, R.
Paredes, J. M.
Paredes-Fortuny, X.
Pedaletti, G.
PERSIC, Massimo 
Poutanen, J.
Prada Moroni, P. G.
PRANDINI, ELISA 
Puljak, I.
Rhode, W.
Ribó, M.
Rico, J.
Rodriguez Garcia, J.
Saito, T.
Satalecka, K.
Schultz, C.
Schweizer, T.
Sillanpää, A.
Sitarek, J.
Snidaric, I.
Sobczynska, D.
STAMERRA, Antonio 
Steinbring, T.
Strzys, M.
Takalo, L.
Takami, H.
TAVECCHIO, Fabrizio 
Temnikov, P.
Terzić, T.
Tescaro, D.
Teshima, M.
Thaele, J.
Torres, D. F.
Toyama, T.
Treves, A.
Vazquez Acosta, M.
Verguilov, V.
Vovk, I.
Ward, J. E.
Will, M.
Wu, M. H.
Zanin, R.
Pfrommer, C.
Pinzke, A.
Zandanel, F.
Issue Date: 2016
Journal: ASTRONOMY & ASTROPHYSICS 
Number: 589
First Page: A33
Abstract: Clusters of galaxies are expected to be reservoirs of cosmic rays (CRs) that should produce diffuse γ-ray emission due to their hadronic interactions with the intra-cluster medium. The nearby Perseus cool-core cluster, identified as the most promising target to search for such an emission, has been observed with the MAGIC telescopes at very-high energies (VHE, E ≳ 100 GeV) for a total of 253 h from 2009 to 2014. The active nuclei of NGC 1275, the central dominant galaxy of the cluster, and IC 310, lying at about 0.6° from the centre, have been detected as point-like VHE γ-ray emitters during the first phase of this campaign. We report an updated measurement of the NGC 1275 spectrum, which is described well by a power law with a photon index Γ = 3.6 ± 0.2<SUB>stat</SUB> ± 0.2<SUB>syst</SUB> between 90 GeV and 1200 GeV. We do not detect any diffuse γ-ray emission from the cluster and so set stringent constraints on its CR population. To bracket the uncertainties over the CR spatial and spectral distributions, we adopt different spatial templates and power-law spectral indexes α. For α = 2.2, the CR-to-thermal pressure within the cluster virial radius is constrained to be ≲ 1-2%, except if CRs can propagate out of the cluster core, generating a flatter radial distribution and releasing the CR-to-thermal pressure constraint to ≲ 20%. Assuming that the observed radio mini-halo of Perseus is generated by secondary electrons from CR hadronic interactions, we can derive lower limits on the central magnetic field, B<SUB>0</SUB>, that depend on the CR distribution. For α = 2.2, B<SUB>0</SUB> ≳ 5-8 μG, which is below the ~25 μG inferred from Faraday rotation measurements, whereas for α ≲ 2.1, the hadronic interpretation of the diffuse radio emission contrasts with our γ-ray flux upper limits independently of the magnetic field strength.
URI: http://hdl.handle.net/20.500.12386/24915
URL: https://www.aanda.org/articles/aa/abs/2016/05/aa27846-15/aa27846-15.html
ISSN: 0004-6361
DOI: 10.1051/0004-6361/201527846
Bibcode ADS: 2016A&A...589A..33A
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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