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MAGIC observations of the microquasar V404 Cygni during the 2015 outburst

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Barrio Uña, Juan Abel and Bonnefoy, Simon and Contreras González, José Luis and Domínguez Díaz, Alberto and Fonseca González, Mª Victoria and Fidalgo, David and López Moya, Marcos and Nievas Rosillo, Mireia and Barres de Almeida, U. and Barrio, J.A. and Otros, ... (2017) MAGIC observations of the microquasar V404 Cygni during the 2015 outburst. Monthly notices of The Royal Astronomical Society, 471 (2). pp. 1688-1693. ISSN 0035-8711

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Official URL: http://dx.doi.org/10.1093/mnras/stx1690

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Abstract

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.

Item Type:	Article
Additional Information:	©2017 Oxford University Press Artículo firmado por más de diez autores We are grateful to Lucia Pavan at UNIGE for the support on the INTEGRAL-IBIS data analysis. We would like to thank Dr. Rodriguez and Prof. Tanaka for providing the multiwavelength data. We thank the anonymous reviewer for the useful comments that helped to set our results in a broader multiwavelength context. We would like to thank the Instituto de Astrofisica de Canarias for the excellent working conditions at the Observatorio del Roque de los Muchachos in La Palma. The financial support of the German BMBF and MPG, the Italian INFN and INAF, the Swiss National Fund SNF, the ERDF under the Spanish MINECO (FPA2015-69818-P, FPA2012-36668, FPA2015-68378-P, FPA2015-69210-C6-2-R, FPA2015-69210-C6-4-R, FPA2015-69210-C6-6-R, AYA2015-71042-P, AYA2016-76012-C3-1-P, ESP2015-71662-C2-2-P, CSD2009-00064) and the Japanese JSPS and MEXT is gratefully acknowledged. This work was also supported by the Spanish Centro de Excelencia 'Severo Ochoa' SEV-2012-0234 and SEV-2015-0548, and Unidad de Excelencia 'Maria de Maeztu' MDM-2014-0369, by the Croatian Science Foundation (HrZZ) Project 09/176 and the University of Rijeka Project 13.12.1.3.02, by the DFG Collaborative Research Centers SFB823/C4 and SFB876/C3, and by the Polish MNiSzW grant 2016/22/M/ST9/00382.
Uncontrolled Keywords:	Gamma-ray emission; Black-hole; Binary; Model; Mass; Accretion,Stars: Individual: V404 Cygni (V404 Cyg); Gamma-rays: General; X-Rays: Binaries
Subjects:	Sciences > Physics > Electricity Sciences > Physics > Electronics Sciences > Physics > Nuclear physics
ID Code:	46175
Deposited On:	30 Jan 2018 08:05
Last Modified:	10 Dec 2018 14:57

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