Bibcode
Ahnen, M. L.; Ansoldi, S.; Antonelli, L. A.; Arcaro, C.; Babić, A.; Banerjee, B.; Bangale, P.; Barres de Almeida, U.; Barrio, J. A.; Becerra González, J.; Bednarek, W.; Bernardini, E.; Berti, A.; Biasuzzi, B.; Biland, A.; Blanch, O.; Bonnefoy, S.; Bonnoli, G.; Carosi, R.; Carosi, A.; Chatterjee, A.; Colin, P.; Colombo, E.; Contreras, J. L.; Cortina, J.; Covino, S.; Cumani, P.; da Vela, P.; Dazzi, F.; de Angelis, A.; de Lotto, B.; de Oña Wilhelmi, E.; di Pierro, F.; Doert, M.; Domínguez, A.; Dominis Prester, D.; Dorner, D.; Doro, M.; Einecke, S.; Eisenacher Glawion, D.; Elsaesser, D.; Engelkemeier, M.; Fallah Ramazani, V.; Fernández-Barral, A.; Fidalgo, D.; Fonseca, M. V.; Font, L.; Fruck, C.; Galindo, D.; García López, R. J.; Garczarczyk, M.; Gaug, M.; Giammaria, P.; Godinović, N.; Gora, D.; Griffiths, S.; Guberman, D.; Hadasch, D.; Hahn, A.; Hassan, T.; Hayashida, M.; Herrera, J.; Hose, J.; Hrupec, D.; Hughes, G.; Ishio, K.; Konno, Y.; Kubo, H.; Kushida, J.; Kuveždić, D.; Lelas, D.; Lindfors, E.; Lombardi, S.; Longo, F.; López, M.; Maggio, C.; Majumdar, P.; Makariev, M.; Maneva, G.; Manganaro, M.; Mannheim, K.; Maraschi, L.; Mariotti, M.; Martínez, M.; Mazin, D.; Menzel, U.; Minev, M.; Mirzoyan, R.; Moralejo, A.; Moreno, V.; Moretti, E.; Neustroev, V.; Niedzwiecki, A.; Nievas Rosillo, M.; Nilsson, K.; Ninci, D.; Nishijima, K.; Noda, K.; Nogués, L.; Paiano, S. et al.
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 471, Issue 2, p.1688-1693
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10
2017
Citations
7
Refereed citations
6
Description
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 ×
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 ×
1010 cm from the compact object.
Related projects
Particle Astrophysics
The MAGIC Collaboration is integrated by 20 research institutes and university departments from Armenia, Bulgaria, Finland, Germany, Italy, Poland, Spain, Switzerland and USA. The collaboration comprises two 17m diameter telescopes, located at the Roque de los Muchachos Observatory, designed to measure the Cherenkov radiation associated with
Ramón
García López