A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
A fast, very-high-energy gamma-ray flare from BL Lacertae during a period of multi-wavelength activity in June 2015




Julkaisun tekijät: V. A. Acciari, S. Ansoldi, L. A. Antonelli, A. Arbet Engels, D. Baack, A. Babić, B. Banerjee, P. Bangale, U. Barres de Almeida, J. A. Barrio, J. Becerra González, W. Bednarek, E. Bernardini, A. Berti, J. Besenrieder, W. Bhattacharyya, C. Bigongiari, A. Biland, O. Blanch, G. Bonnoli, R. Carosi, G. Ceribella, S. Cikota, S. M. Colak, P. Colin, E. Colombo, J. L. Contreras, J. Cortina, S. Covino, V. D’Elia, P. Da Vela, F. Dazzi, A. De Angelis, B. De Lotto, M. Delfino, J. Delgado, F. Di Pierro, E. Do Souto Espiñera, A. Domínguez, D. Dominis Prester, D. Dorner, M. Doro, S. Einecke, D. Elsaesser, V. Fallah Ramazani, A. Fattorini, A. Fernández-Barral, G. Ferrara, D. Fidalgo, L. Foffano, M. V. Fonseca, L. Font, C. Fruck, D. Galindo, S. Gallozzi, R. J. García López, M. Garczarczyk, M. Gaug, P. Giammaria, N. Godinović, D. Guberman, D. Hadasch, A. Hahn, T. Hassan, J. Herrera, J. Hoang, D. Hrupec, S. Inoue, K. Ishio, Y. Iwamura, H. Kubo, J. Kushida, D. Kuveždić, A. Lamastra, D. Lelas, F. Leone, E. Lindfors, S. Lombardi, F. Longo, M. López, A. López-Oramas, C. Maggio, P. Majumdar, M. Makariev, G. Maneva, M. Manganaro, K. Mannheim, L. Maraschi, M. Mariotti, M. Martínez, S. Masuda, D. Mazin, M. Minev, J. M. Mirand, R. Mirzoyan, E. Molina, A. Moralejo, V. Moreno, E. Moretti, P. Munar-Adrover, V. Neustroev, A. Niedzwiecki, M. Nievas Rosillo, C. Nigro, K. Nilsson, D. Ninci, K. Nishijima, K. Noda, L. Nogués, M. Nöthe, S. Paiano, J. Palacio, D. Paneque, R. Paoletti, J. M. Paredes, G. Pedaletti, P. Peñil, M. Peresano, M. Persic, P. G. Prada Moroni, E. Prandini, I. Puljak, J. R. Garcia, W. Rhode, M. Ribó, J. Rico, C. Righi, A. Rugliancich, L. Saha, T. Saito, K. Satalecka, T. Schweizer, J. Sitarek, I. Šnidarić, D. Sobczynska, A. Somero, A. Stamerra, M. Strzys, T. Surić, F. Tavecchio, P. Temnikov, T. Terzić6, M. Teshima, N. Torres-Albà, S. Tsujimoto, J. van Scherpenberg, G. Vanzo, M. Vazquez Acosta, I. Vovk, M. Will, D. Zarić, F. D’Ammando, K. Hada, S. Jorstad, A. P. Marscher, M. Z. Mobeen, T. Hovatta, V. M. Larionov, G. A. Borman, T. S. Grishina, E. N. Kopatskaya, D. A. Morozova, A. A. Nikiforova, A. Lähteenmäki, M. Tornikoski, I. Agudo
Kustantaja: EDP SCIENCES S A
Julkaisuvuosi: 2019
Journal: Astronomy and Astrophysics
Tietokannassa oleva lehden nimi: ASTRONOMY & ASTROPHYSICS
Lehden akronyymi: ASTRON ASTROPHYS
Volyymi: 623
Sivujen määrä: 14
ISSN: 1432-0746
eISSN: 1432-0746

Tiivistelmä
The mechanisms producing fast variability of the gamma-ray emission in active galactic nuclei (AGNs) are under debate. The MAGIC telescopes detected a fast, very-high-energy (VHE, E > 100 GeV) gamma-ray flare from BL Lacertae on 2015 June 15. The flare had a maximum flux of (1.5 +/- 0.3)-10(-10) photons cm(-2) s(-1) and halving time of 26 +/- 8 min. The MAGIC observations were triggered by a high state in the optical and high-energy (HE, E > 100 MeV) gamma-ray bands. In this paper we present the MAGIC VHE gamma-ray data together with multi-wavelength data from radio, optical, X-rays, and HE gamma rays from 2015 May 1 to July 31. Well-sampled multi-wavelength data allow us to study the variability in detail and compare it to the other epochs when fast, VHE gamma-ray flares have been detected from this source. Interestingly, we find that the behaviour in radio, optical, X-rays, and HE gamma-rays is very similar to two other observed VHE gamma-ray flares. In particular, also during this flare there was an indication of rotation of the optical polarization angle and of activity at the 43 GHz core. These repeating patterns indicate a connection between the three events. We also test modelling of the spectral energy distribution based on constraints from the light curves and VLBA observations, with two different geometrical setups of two-zone inverse Compton models. In addition we model the gamma-ray data with the star-jet interaction model. We find that all of the tested emission models are compatible with the fast VHE gamma-ray flare, but all have some tension with the multi-wavelength observations.

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Last updated on 2019-21-08 at 20:01