MAGIC observations of the microquasar V404 Cygni during the 2015 outburst
Giammaria P; Moreno V; Majumdar P; Lelas D; Hayashida M; Nogues L; Ward JE; Babic A; Sitarek J; Wilhelmi ED; Gora D; De Lotto B; Dominguez A; Barrio JA; Hose J; Rodriguez J; de Almeida UB; Biasuzzi B; Menzel U; Contreras JL; Moretti E; Hadasch D; Minev M; Lombardi S; Suric T; Schroeder S; Paredes JM; Maraschi L; Longo F; Loh A; Sobczynska D; Prester DD; Dorner D; Terzic T; Mirzoyan R; Mariotti M; Ninci D; Fidalgo D; Torres DF; Paoletti R; Saito T; Kubo H; Kuvezdic D; Ahnen ML; Herrera J; Hughes G; Moroni PGP; Schweizer T; Satalecka K; Tescaro D; Antonelli LA; Lopez RJG; Vovk I; Manganaro M; Glawion DE; De Angelis A; Nishijima K; Dazzi F; Hahn A; Sillanpaa A; Nilsson K; Chatterjee A; Maggio C; Engelkemeier M; Bednarek W; Paiano S; Paneque D; Fonseca MV; Perri L; Noda K; Tavecchio F; Carosi R; Mazin D; Bangale P; Ishio K; Ansoldi S; Guberman D; Covino S; Ramazani VF; Neustroev V; Berti A; Torres-Alba N; Cumani P; Stamerra A; Vanzo G; Gaug M; Palacio J; Griffiths S; Bonnefoy S; Cortina J; Persic M; Makariev M; Font L; Teshima M; Di Pierro F; Rico J; Colombo E; Lopez M; Ribo M; Colin P; Rosillo MN; Fruck C; Temnikov P; Will M; Blanch O; Banerjee B; Garcia JR; Da Vela P; Puljak I; Maneva G; Paredes-Fortuny X; Lindfors E; Zaric D; Elsaesser D; Doert M; Godinovic N; Hrupec D; Einecke S; Arcaro C; Prandini E; Konno Y; Doro M; Moralejo A; Gonzalez JB; Niedzwiecki A; Bonnoli G; Martinez M; Hassan T; Rhode W; Pedaletti G; Acosta MV; Garczarczyk M; Mannheim K; Bernardini E; Fernandez-Barral A; Treves A; Galindo D; Takalo L; Carosi A; Strzys M; Peresano M; Reichardt I; Kushida J; Biland A; Snidaric I
MAGIC observations of the microquasar V404 Cygni during the 2015 outburst
OXFORD UNIV PRESS
Julkaisun pysyvä osoite on:
https://urn.fi/URN:NBN:fi-fe2021042717117
https://urn.fi/URN:NBN:fi-fe2021042717117
Tiivistelmä
The microquasar V404 Cygni underwent a series of outbursts in 2015, June 15-31, during which its flux in hard X-rays (20-40 keV) reached about 40 times the Crab nebula flux. Because of the exceptional interest of the flaring activity from this source, observations at several wavelengths were conducted. The MAGIC telescopes, triggered by the INTEGRAL alerts, followed-up the flaring source for several nights during the period June 18-27, for more than 10 h. One hour of observation was simultaneously conducted on a giant 22 GHz radio flare and a hint of signal at GeV energies seen by Fermi-LAT. The MAGIC observations did not show significant emission in any of the analysed time intervals. The derived flux upper limit, in the energy range 200-1250 GeV, is 4.8 x 10(-12) photons cm(-2) s(-1). We estimate the gamma-ray opacity during the flaring period, which along with our non-detection points to an inefficient acceleration in the V404 Cyg jets if a very high energy emitter is located further than 1 x 10(10) cm from the compact object.
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