Bibcode
Ahnen, M. L.; Ansoldi, S.; Antonelli, L. A.; Arcaro, C.; Baack, D.; Babić, A.; Banerjee, B.; Bangale, P.; Barres de Almeida, U.; Barrio, J. A.; Becerra González, J.; Bednarek, W.; Bernardini, E.; Ch Berse, R.; Berti, A.; Bhattacharyya, W.; Biland, A.; Blanch, O.; Bonnoli, G.; Carosi, R.; Carosi, A.; Ceribella, G.; Chatterjee, A.; Colak, S. M.; Colin, P.; Colombo, E.; Contreras, J. L.; Cortina, J.; Covino, S.; Cumani, P.; da Vela, P.; Dazzi, F.; de Angelis, A.; de Lotto, B.; Delfino, M.; Delgado, J.; di Pierro, F.; Domínguez, A.; Dominis Prester, D.; Dorner, D.; Doro, M.; Einecke, S.; Elsaesser, D.; Fallah Ramazani, V.; Fernández-Barral, A.; Fidalgo, D.; Fonseca, M. V.; Font, L.; Fruck, C.; Galindo, D.; Gallozzi, S.; García López, R. J.; Garczarczyk, M.; Gaug, M.; Giammaria, P.; Godinović, N.; Gora, D.; Guberman, D.; Hadasch, D.; Hahn, A.; Hassan, T.; Hayashida, M.; Herrera, J.; Hose, J.; Hrupec, D.; 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.; Masuda, S.; Mazin, D.; Mielke, K.; Minev, M.; Miranda, J. M.; Mirzoyan, R.; Moralejo, A.; Moreno, V.; Moretti, E.; Nagayoshi, T.; Neustroev, V.; Niedzwiecki, A.; Nievas Rosillo, M.; Nigro, C.; Nilsson, K.; Ninci, D. et al.
Referencia bibliográfica
Astronomy and Astrophysics, Volume 619, id.A45, 18 pp.
Fecha de publicación:
11
2018
Revista
Número de citas
34
Número de citas referidas
31
Descripción
Context. The BL Lac object S5 0716+714, a highly variable blazar,
underwent an impressive outburst in January 2015 (Phase A), followed by
minor activity in February (Phase B). The MAGIC observations were
triggered by the optical flux observed in Phase A, corresponding to the
brightest ever reported state of the source in the R-band. Aims.The
comprehensive dataset collected is investigated in order to shed light
on the mechanism of the broadband emission. Methods:
Multi-wavelength light curves have been studied together with the
broadband spectral energy distributions (SEDs). The sample includes data
from Effelsberg, OVRO, Metsähovi, VLBI, CARMA, IRAM, SMA,
Swift-UVOT, KVA, Tuorla, Steward, RINGO3, KANATA, AZT-8+ST7, Perkins,
LX-200, Swift-XRT, NuSTAR, Fermi-LAT and MAGIC. Results: The
flaring state of Phase A was detected in all the energy bands, providing
for the first time a multi-wavelength sample of simultaneous data from
the radio band to the very-high-energy (VHE, E > 100 GeV). In the
constructed SED, the Swift-XRT+NuSTAR data constrain the transition
between the synchrotron and inverse Compton components very accurately,
while the second peak is constrained from 0.1 GeV to 600 GeV by
Fermi+MAGIC data. The broadband SED cannot be described with a one-zone
synchrotron self-Compton model as it severely underestimates the optical
flux in order to reproduce the X-ray to γ-ray data. Instead we use
a two-zone model. The electric vector position angle (EVPA) shows an
unprecedented fast rotation. An estimation of the redshift of the source
by combined high-energy (HE, 0.1 GeV < E < 100 GeV) and VHE data
provides a value of z = 0.31 ± 0.02stats ±
0.05sys, confirming the literature value. Conclusions:
The data show the VHE emission originating in the entrance and exit of a
superluminal knot in and out of a recollimation shock in the inner jet.
A shock-shock interaction in the jet seems responsible for the observed
flares and EVPA swing. This scenario is also consistent with the SED
modeling.
The complete data set shown in Figs. 1 and 2, the data points shown in
Figs. 8 and 9 and Table A.1 are only available at the CDS via anonymous
ftp to http://cdsarc.u-strasbg.fr (http://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/619/A45
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