Bibcode
Ahnen, M. L.; Ansoldi, S.; Antonelli, L. A.; Antoranz, P.; Babic, A.; Banerjee, B.; Bangale, P.; Barres de Almeida, U.; Barrio, J. A.; Becerra González, J.; Bednarek, W.; Bernardini, E.; Biasuzzi, B.; Biland, A.; Blanch, O.; Bonnefoy, S.; Bonnoli, G.; Borracci, F.; Bretz, T.; Buson, S.; Carosi, A.; Chatterjee, A.; Clavero, R.; Colin, P.; Colombo, E.; Contreras, J. L.; Cortina, J.; Covino, S.; 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.; Fallah Ramazani, V.; Fernández-Barral, A.; Fidalgo, D.; Fonseca, M. V.; Font, L.; Frantzen, K.; Fruck, C.; Galindo, D.; García López, R. J.; Garczarczyk, M.; Garrido Terrats, D.; Gaug, M.; Giammaria, P.; Godinović, N.; González Muñoz, A.; Gora, D.; Guberman, D.; Hadasch, D.; Hahn, A.; Hanabata, Y.; Hayashida, M.; Herrera, J.; Hose, J.; Hrupec, D.; Hughes, G.; Idec, W.; Kodani, K.; Konno, Y.; Kubo, H.; Kushida, J.; La Barbera, A.; Lelas, D.; Lindfors, E.; Lombardi, S.; Longo, F.; López, M.; López-Coto, R.; Majumdar, P.; Makariev, M.; Mallot, K.; Maneva, G.; Manganaro, M.; Mannheim, K.; Maraschi, L.; Marcote, B.; Mariotti, M.; Martínez, M.; Mazin, D.; Menzel, U.; Miranda, J. M.; Mirzoyan, R.; Moralejo, A.; Moretti, E.; Nakajima, D.; Neustroev, V.; Niedzwiecki, A.; Nievas Rosillo, M.; Nilsson, K. et al.
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 459, Issue 3, p.3271-3281
Advertised on:
7
2016
Citations
22
Refereed citations
20
Description
The Major Atmospheric Gamma-ray Imaging Cherenkov (MAGIC) telescopes
observed the BL Lac object H1722+119 (redshift unknown) for six
consecutive nights between 2013 May 17 and 22, for a total of 12.5 h.
The observations were triggered by high activity in the optical band
measured by the KVA (Kungliga Vetenskapsakademien) telescope. The source
was for the first time detected in the very high energy (VHE, E > 100
GeV) γ-ray band with a statistical significance of 5.9σ. The
integral flux above 150 GeV is estimated to be (2.0 ± 0.5) per
cent of the Crab nebula flux. We used contemporaneous high energy (HE,
100 MeV < E < 100 GeV) γ-ray observations from Fermi-Large
Area Telescope to estimate the redshift of the source. Within the
framework of the current extragalactic background light models, we
estimate the redshift to be z = 0.34 ± 0.15. Additionally, we
used contemporaneous X-ray to radio data collected by the instruments on
board the Swift satellite, the KVA, and the Owens Valley Radio
Observatory telescope to study multifrequency characteristics of the
source. We found no significant temporal variability of the flux in the
HE and VHE bands. The flux in the optical and radio wavebands, on the
other hand, did vary with different patterns. The spectral energy
distribution of H1722+119 shows surprising behaviour in the ˜3
× 1014-1018 Hz frequency range. It can be
modelled using an inhomogeneous helical jet synchrotron self-Compton
model.