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1. Constraints on the cosmic ray cluster physics with a very deep observation of the Perseus cluster with MAGIC

Author

Anders Pinzke, Pierre Colin, Christoph Pfrommer, Fabio Zandanel, Monica Vazquez Acosta, J. Palacio, and String Theory (ITFA, IoP, FNWI)

Subjects
High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Structure formation, Proton, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Cosmic ray, Astrophysics, Electron, Astrophysics::Cosmology and Extragalactic Astrophysics, Galaxy, Synchrotron, law.invention, law, Cluster (physics), Astrophysics - High Energy Astrophysical Phenomena, Galaxy cluster, Astrophysics::Galaxy Astrophysics
Abstract

Galaxy clusters are the largest and most massive gravitationally bound structures known in the Universe. Cosmic-Ray (CR) hadrons accelerated at structure formation shocks and injected by galaxies, are confined in galaxy clusters where they accumulate for cosmological times. The presence of diffuse synchrotron radio emission in several clusters proves the existence of high-energy electrons, and magnetic fields. However, a direct proof of CR proton acceleration is missing. The presence of CR protons can be probe through the diffuse gamma-ray emission induced by their hadronic interaction with the Intra-Cluster Medium (ICM). The Perseus cluster, a nearby cool-core cluster, has been identified to be among the best candidates to detect such emission. We present here the results of a very deep observation of the Perseus cluster with the MAGIC telescopes, accumulating about 250 hours of data from 2009 to 2014. No evidence of large-scale very-high-energy gamma-ray emission from CR-ICM interactions has been detected. The derived flux upper limits in the TeV regime allow us to put stringent constraints on the physics of cluster CRs, in particular on the CR-to-thermal pressure, the CR acceleration efficiency at formation shocks and the magnetic field of the central cluster region., Proceedings of The 34th International Cosmic Ray Conference (ICRC 2015), 8 pages, 8 figures

Published
2015

2. Detection of very-high energy gamma-ray emission from NGC 1275 by the MAGIC telescopes

Author

H. Vankov, Ilana M. Braun, E. De Cea del Pozo, A. López-Oramas, Wlodek Bednarek, Alessandro Carosi, Ruben Lopez-Coto, D. Garrido, Jose Miguel Miranda, Thomas Bretz, S. N. Shore, T. Jogler, Abelardo Moralejo, Wolfgang Rhode, A. Diago Ortega, Robert Wagner, Dario Hrupec, M. A. Lopez, J. Moldón, K. Saito, M. V. Fonseca, A. De Angelis, Nijil Mankuzhiyil, D. Dominis Prester, T. Krähenbühl, P. Munar-Adrover, Patrick Vogler, Francesco Dazzi, R. Reinthal, A. Cañellas, Ignasi Reichardt, Stefano Covino, L. A. Antonelli, M. Doert, Michael Backes, Victor Stamatescu, E. Leonardo, B. Steinke, Konstancja Satalecka, Dominik Elsaesser, N. Strah, Michele Doro, U. Barres de Almeida, G. Maneva, R. Zanin, Jelena Aleksić, Francisco Prada, C. Delgado Mendez, S. R. Gozzini, A. Saggion, A. Niedzwiecki, Damir Lelas, Fabrizio Tavecchio, P. Temnikov, Adrian Biland, David Paneque, Fabio Zandanel, Shan Sun, I. Snidaric, Silvia Pardo, J. Rico, S. Rügamer, Daniel Nieto, Kari Nilsson, R. J. García López, Juan Abel Barrio, Dorota Sobczyńska, S. Spiro, E. Lorenz, D. Borla Tridon, Riccardo Paoletti, Daniela Dorner, K. Berger, M. Uellenbeck, L. Maraschi, Elina Lindfors, G. De Caneva, J. M. Paredes, Antonio Stamerra, Daniel Mazin, Massimo Persic, Diego F. Torres, E. A. Alvarez, M. Pilia, P. G. Prada Moroni, T. Schweizer, E. Prandini, V. Scalzotto, S. Partini, D. Höhne-Mönch, O. Tibolla, Felix Spanier, Christoph Pfrommer, M. Shayduk, J. Storz, Elisa Bernardini, Nikola Godinovic, Aldo Treves, H. Kellermann, J. Krause, B. De Lotto, P. Antoranz, Masahiro Teshima, Takashi Saito, Marc Ribó, Gianluca Giavitto, Jose Luis Contreras, Ivica Puljak, Pierre Colin, M. Salvati, S. Klepser, Reiko Orito, Juan Cortina, Martin Makariev, A. Sillanpää, Julian Sitarek, Oscar Blanch, J. Hose, Daniela Hadasch, C. Fruck, J. Kushida, Anders Pinzke, Andrei Berdyugin, C. Schultz, V. Scapin, Tomislav Terzić, Aaron Dominguez, Victor Zabalza, Giacomo Bonnoli, M. Asensio, L. Font, Hajime Takami, I. Puerto Gimenez, E. Colombo, D. Hildebrand, L. Peruzzo, Ralph Bock, A. Boller, L. Cossio, L. O. Takalo, Mosè Mariotti, Artemio Herrero, Saverio Lombardi, J. Pochon, D. Häfner, M. I. Martínez, D. Tescaro, R. Mirzoyan, D. Eisenacher, Natalia Lewandowska, E. Carmona, Markus Garczarczyk, Nina Nowak, A. La Barbera, M. A. Perez-Torres, J. Becerra González, Mario Meucci, Denis Bastieri, Q. Weitzel, Tihomir Surić, S. Paiano, Karl Mannheim, and Daniel Ferenc

Subjects
POLARIZATION, Radio galaxy, Astrophysics::High Energy Astrophysical Phenomena, NGC-1275, Flux, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, gamma ray astronomy, Cosmic rays, IMAGING CHERENKOV DETECTOR, 01 natural sciences, Power law, Raigs gamma, 0103 physical sciences, MAGIC (telescope), galaxies: active, galaxies: jets, galaxies: individual (NGC 1275), galaxies: individual (IC 310), gamma rays: galaxies, Nuclear Experiment, 010303 astronomy & astrophysics, CRAB-NEBULA, GALAXY M87, IC 310, PERFORMANCE, DISCOVERY, EVOLUTION, VERITAS, astro-ph.HE, Physics, Spectral index, 010308 nuclear & particles physics, Gamma rays, Gamma ray, Astronomy and Astrophysics, Galaxies, Light curve, Galaxy, Galàxies, Space and Planetary Science, ddc:520, High Energy Physics::Experiment, Electrónica, Física nuclear, Electricidad, Astrophysics - High Energy Astrophysical Phenomena
Abstract

We report on the detection of very-high energy (VHE, E>100 GeV) gamma-ray emission from NGC 1275, the central radio galaxy of the Perseus cluster of galaxies. The source has been detected by the MAGIC telescopes with a statistical significance of 6.6 sigma above 100 GeV in 46 hr of stereo observations carried out between August 2010 and February 2011. The measured differential energy spectrum between 70 GeV and 500 GeV can be described by a power law with a steep spectral index of \Gamma=-4.1+/-0.7stat+/-0.3syst, and the average flux above 100 GeV is F_{gamma}=(1.3+/-0.2stat+/-0.3syst) x 10^-11 cm^-2 s^-1. These results, combined with the power-law spectrum measured in the first two years of observations by the Fermi-LAT above 100 MeV, with a spectral index of Gamma ~ -2.1, strongly suggest the presence of a break or cut-off around tens of GeV in the NGC 1275 spectrum. The light curve of the source above 100 GeV does not show hints of variability on a month time scale. Finally, we report on the nondetection in the present data of the radio galaxy IC 310, previously discovered by the Fermi-LAT and MAGIC. The derived flux upper limit F^{U.L.}_{gamma} (>300 GeV)=1.2 x 10^-12 cm^-2 s^-1 is a factor ~ 3 lower than the mean flux measured by MAGIC between October 2009 and February 2010, thus confirming the year time-scale variability of the source at VHE., Comment: Corresponding authors are S. Lombardi, P. Colin, D. Hildebrand, and F. Zandanel. Published in A&A; 4 pages, 4 figures

Published
2012

3. Constraining cosmic rays and magnetic fields in the Perseus galaxy cluster with TeV observations by the MAGIC telescopes

Author

S. Partini, D. Höhne-Mönch, V. Scalzotto, Silvia Pardo, G. De Caneva, Ivica Puljak, Pierre Colin, D. Dominis Prester, Martin Makariev, Oscar Blanch, Francisco Prada, Thomas Bretz, S. N. Shore, Marc Ribó, J. Krause, J. M. Paredes, Antonio Stamerra, A. Sillanpää, M. V. Fonseca, J. Storz, Kari Nilsson, B. De Lotto, Riccardo Paoletti, M. Doert, Michael Backes, P. Temnikov, Fabio Zandanel, Shan Sun, J. Kushida, E. Prandini, Aldo Treves, Christian Fruck, E. A. Alvarez, L. A. Antonelli, K. Berger, Nijil Mankuzhiyil, P. Munar-Adrover, P. Antoranz, B. Steinke, Jose Luis Contreras, Stefano Covino, Julian Sitarek, J. Hose, T. Jogler, Daniela Hadasch, Anders Pinzke, S. Klepser, Juan Cortina, R. Reinthal, Nikola Godinovic, M. Pilia, Wolfgang Rhode, Dominik Elsaesser, Abelardo Moralejo, E. Colombo, U. Barres de Almeida, Damir Lelas, Felix Spanier, Daniel Ferenc, Daniel Nieto, Konstancja Satalecka, Michele Doro, Masahiro Teshima, Dorota Sobczyńska, J. Moldón, S. Rügamer, Juan Abel Barrio, H. Vankov, Ralph Bock, Christoph Pfrommer, L. O. Takalo, M. Uellenbeck, D. Borla Tridon, R. Mirzoyan, Ilana M. Braun, T. Schweizer, Tomislav Terzić, D. Eisenacher, Fabrizio Tavecchio, Ll. Font, A. Cañellas, D. Häfner, M. Salvati, I. Snidaric, A. Diago Ortega, Robert Wagner, Giacomo Bonnoli, Mosè Mariotti, E. De Cea del Pozo, E. Carmona, Markus Garczarczyk, M. Asensio, Victor Stamatescu, Dario Hrupec, Saverio Lombardi, L. Maraschi, Elina Lindfors, Jelena Aleksić, S. Spiro, E. Lorenz, J. Pochon, M. A. Lopez, K. Saito, Daniel Mazin, A. Niedzwiecki, Patrick Vogler, Diego F. Torres, David Paneque, Nina Nowak, Takashi Saito, M. A. Perez-Torres, Reiko Orito, I. Puerto Gimenez, D. Hildebrand, L. Peruzzo, M. I. Martínez, D. Tescaro, A. Boller, L. Cossio, Artemio Herrero, Natalia Lewandowska, Daniela Dorner, A. La Barbera, J. Becerra González, Mario Meucci, Elisa Bernardini, Denis Bastieri, Q. Weitzel, Tihomir Surić, H. Kellermann, S. Paiano, Karl Mannheim, C. Delgado Mendez, S. R. Gozzini, Gianluca Giavitto, A. De Angelis, P. G. Prada Moroni, Ignasi Reichardt, O. Tibolla, M. Shayduk, Francesco Dazzi, G. Maneva, R. J. García López, E. Leonardo, R. Zanin, A. Saggion, Massimo Persic, Adrian Biland, T. Krähenbühl, N. Strah, J. Rico, Andrei Berdyugin, A. López-Oramas, Wlodek Bednarek, Alessandro Carosi, C. Schultz, Ruben Lopez-Coto, V. Scapin, D. Garrido, Aaron Dominguez, Jose Miguel Miranda, Victor Zabalza, and Hajime Takami

Subjects
Radio galaxy, gamma rays: galaxies: clusters, acceleration of particles, galaxies: clusters: individual: Perseus, Astrophysics, SCALING RELATIONS, 01 natural sciences, 7. Clean energy, Raigs gamma, DIFFUSE RADIO-EMISSION, HADRONIC MODELS, 010303 astronomy & astrophysics, PARTICLE HYDRODYNAMICS SIMULATIONS, GAMMA-RAY, X-RAY, COMA CLUSTER, DARK-MATTER, INTRACLUSTER MEDIUM, HESS OBSERVATIONS, Physics, astro-ph.HE, High Energy Astrophysical Phenomena (astro-ph.HE), Clusters of galaxies, Cosmic rays, gamma ray astronomy, IMAGING CHERENKOV DETECTOR, 16. Peace & justice, Magnetic field, astro-ph.CO, Electrónica, Física nuclear, Electricidad, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Nongalactic Astrophysics, Cúmuls de galàxies, Structure formation, Active galactic nucleus, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Cosmic ray, Astrophysics::Cosmology and Extragalactic Astrophysics, 0103 physical sciences, Cluster (physics), Cherenkov radiation, Galaxy cluster, Astrophysics::Galaxy Astrophysics, 010308 nuclear & particles physics, Gamma rays, Astronomy and Astrophysics, Galaxies, Galàxies, 13. Climate action, Space and Planetary Science, ddc:520
Abstract

Galaxy clusters are being assembled today in the most energetic phase of hierarchical structure formation which manifests itself in powerful shocks that contribute to a substantial energy density of cosmic rays (CRs). Hence, clusters are expected to be luminous gamma-ray emitters since they also act as energy reservoirs for additional CR sources, such as active galactic nuclei and supernova-driven galactic winds. To detect the gamma-ray emission from CR interactions with the ambient cluster gas, we conducted the deepest to date observational campaign targeting a galaxy cluster at very high-energy gamma-rays and observed the Perseus cluster with the MAGIC Cherenkov telescopes for a total of ~85 hr of effective observing time. This campaign resulted in the detection of the central radio galaxy NGC 1275 at energies E > 100 GeV with a very steep energy spectrum. Here, we restrict our analysis to energies E > 630 GeV and detect no significant gamma-ray excess. This constrains the average CR-to-thermal pressure ratio to be 4-9 microG, depending on the rate of decline of the magnetic field strength toward larger radii., Corresponding authors are F. Zandanel, C. Pfrommer, P. Colin, A. Pinzke and S. Lombardi. Accepted for publication in A&A on 06/03/2012

Published
2012

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