ALBERT

Description: Microquasars are binary star systems with relativistic radio-emitting jets. They are potential sources of cosmic rays and can be used to elucidate the physics of relativistic jets. We report the detection of variable gamma-ray emission above 100 gigaelectron volts from the microquasar LS I 61 + 303. Six orbital cycles were recorded. Several detections occur at a similar orbital phase, which suggests that the emission is periodic. The strongest gamma-ray emission is not observed when the two stars are closest to one another, implying a strong orbital modulation of the emission or absorption processes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Albert, J -- Aliu, E -- Anderhub, H -- Antoranz, P -- Armada, A -- Asensio, M -- Baixeras, C -- Barrio, J A -- Bartelt, M -- Bartko, H -- Bastieri, D -- Bavikadi, S R -- Bednarek, W -- Berger, K -- Bigongiari, C -- Biland, A -- Bisesi, E -- Bock, R K -- Bordas, P -- Bosch-Ramon, V -- Bretz, T -- Britvitch, I -- Camara, M -- Carmona, E -- Chilingarian, A -- Ciprini, S -- Coarasa, J A -- Commichau, S -- Contreras, J L -- Cortina, J -- Curtef, V -- Danielyan, V -- Dazzi, F -- De Angelis, A -- de Los Reyes, R -- De Lotto, B -- Domingo-Santamaria, E -- Dorner, D -- Doro, M -- Errando, M -- Fagiolini, M -- Ferenc, D -- Fernandez, E -- Firpo, R -- Flix, J -- Fonseca, M V -- Font, L -- Fuchs, M -- Galante, N -- Garczarczyk, M -- Gaug, M -- Giller, M -- Goebel, F -- Hakobyan, D -- Hayashida, M -- Hengstebeck, T -- Hohne, D -- Hose, J -- Hsu, C C -- Isar, P G -- Jacon, P -- Kalekin, O -- Kosyra, R -- Kranich, D -- Laatiaoui, M -- Laille, A -- Lenisa, T -- Liebing, P -- Lindfors, E -- Lombardi, S -- Longo, F -- Lopez, J -- Lopez, M -- Lorenz, E -- Lucarelli, F -- Majumdar, P -- Maneva, G -- Mannheim, K -- Mansutti, O -- Mariotti, M -- Martinez, M -- Mase, K -- Mazin, D -- Merck, C -- Meucci, M -- Meyer, M -- Miranda, J M -- Mirzoyan, R -- Mizobuchi, S -- Moralejo, A -- Nilsson, K -- Ona-Wilhelmi, E -- Orduna, R -- Otte, N -- Oya, I -- Paneque, D -- Paoletti, R -- Paredes, J M -- Pasanen, M -- Pascoli, D -- Pauss, F -- Pavel, N -- Pegna, R -- Persic, M -- Peruzzo, L -- Piccioli, A -- Poller, M -- Pooley, G -- Prandini, E -- Raymers, A -- Rhode, W -- Ribo, M -- Rico, J -- Riegel, B -- Rissi, M -- Robert, A -- Romero, G E -- Rugamer, S -- Saggion, A -- Sanchez, A -- Sartori, P -- Scalzotto, V -- Scapin, V -- Schmitt, R -- Schweizer, T -- Shayduk, M -- Shinozaki, K -- Shore, S N -- Sidro, N -- Sillanpaa, A -- Sobczynska, D -- Stamerra, A -- Stark, L S -- Takalo, L -- Temnikov, P -- Tescaro, D -- Teshima, M -- Tonello, N -- Torres, A -- Torres, D F -- Turini, N -- Vankov, H -- Vitale, V -- Wagner, R M -- Wibig, T -- Wittek, W -- Zanin, R -- Zapatero, J -- New York, N.Y. -- Science. 2006 Jun 23;312(5781):1771-3. Epub 2006 May 18.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Universitat Wurzburg, D-97074 Wurzburg, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16709745" target="_blank"〉PubMed〈/a〉

Description: The atmospheric Cherenkov gamma-ray telescope MAGIC, designed for a low-energy threshold, has detected very-high-energy gamma rays from a giant flare of the distant Quasi-Stellar Radio Source (in short: radio quasar) 3C 279, at a distance of more than 5 billion light-years (a redshift of 0.536). No quasar has been observed previously in very-high-energy gamma radiation, and this is also the most distant object detected emitting gamma rays above 50 gigaelectron volts. Because high-energy gamma rays may be stopped by interacting with the diffuse background light in the universe, the observations by MAGIC imply a low amount for such light, consistent with that known from galaxy counts.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉MAGIC Collaboration -- Albert, J -- Aliu, E -- Anderhub, H -- Antonelli, L A -- Antoranz, P -- Backes, M -- Baixeras, C -- Barrio, J A -- Bartko, H -- Bastieri, D -- Becker, J K -- Bednarek, W -- Berger, K -- Bernardini, E -- Bigongiari, C -- Biland, A -- Bock, R K -- Bonnoli, G -- Bordas, P -- Bosch-Ramon, V -- Bretz, T -- Britvitch, I -- Camara, M -- Carmona, E -- Chilingarian, A -- Commichau, S -- Contreras, J L -- Cortina, J -- Costado, M T -- Covino, S -- Curtef, V -- Dazzi, F -- De Angelis, A -- De Cea Del Pozo, E -- de Los Reyes, R -- De Lotto, B -- De Maria, M -- De Sabata, F -- Mendez, C Delgado -- Dominguez, A -- Dorner, D -- Doro, M -- Errando, M -- Fagiolini, M -- Ferenc, D -- Fernandez, E -- Firpo, R -- Fonseca, M V -- Font, L -- Galante, N -- Lopez, R J Garcia -- Garczarczyk, M -- Gaug, M -- Goebel, F -- Hayashida, M -- Herrero, A -- Hohne, D -- Hose, J -- Hsu, C C -- Huber, S -- Jogler, T -- Kneiske, T M -- Kranich, D -- La Barbera, A -- Laille, A -- Leonardo, E -- Lindfors, E -- Lombardi, S -- Longo, F -- Lopez, M -- Lorenz, E -- Majumdar, P -- Maneva, G -- Mankuzhiyil, N -- Mannheim, K -- Maraschi, L -- Mariotti, M -- Martinez, M -- Mazin, D -- Meucci, M -- Meyer, M -- Miranda, J M -- Mirzoyan, R -- Mizobuchi, S -- Moles, M -- Moralejo, A -- Nieto, D -- Nilsson, K -- Ninkovic, J -- Otte, N -- Oya, I -- Panniello, M -- Paoletti, R -- Paredes, J M -- Pasanen, M -- Pascoli, D -- Pauss, F -- Pegna, R G -- Perez-Torres, M A -- Persic, M -- Peruzzo, L -- Piccioli, A -- Prada, F -- Prandini, E -- Puchades, N -- Raymers, A -- Rhode, W -- Ribo, M -- Rico, J -- Rissi, M -- Robert, A -- Rugamer, S -- Saggion, A -- Saito, T Y -- Salvati, M -- Sanchez-Conde, M -- Sartori, P -- Satalecka, K -- Scalzotto, V -- Scapin, V -- Schmitt, R -- Schweizer, T -- Shayduk, M -- Shinozaki, K -- Shore, S N -- Sidro, N -- Sierpowska-Bartosik, A -- Sillanpaa, A -- Sobczynska, D -- Spanier, F -- Stamerra, A -- Stark, L S -- Takalo, L -- Tavecchio, F -- Temnikov, P -- Tescaro, D -- Teshima, M -- Tluczykont, M -- Torres, D F -- Turini, N -- Vankov, H -- Venturini, A -- Vitale, V -- Wagner, R M -- Wittek, W -- Zabalza, V -- Zandanel, F -- Zanin, R -- Zapatero, J -- New York, N.Y. -- Science. 2008 Jun 27;320(5884):1752-4. doi: 10.1126/science.1157087.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Universitat Wurzburg, D-97074 Wurzburg, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18583607" target="_blank"〉PubMed〈/a〉