Bibcode
Miranda, J. M.; Mirzoyan, R.; Moralejo, A.; Munar-Adrover, P.; Nakajima, D.; Menzel, U.; Meucci, M.; Marcote, B.; Mariotti, M.; Martínez, M.; Mazin, D.; Maneva, G.; Mankuzhiyil, N.; Mannheim, K.; Maraschi, L.; Kellermann, H.; Kodani, K.; Konno, Y.; Krause, J.; Kubo, H.; Kushida, J.; La Barbera, A.; Lelas, D.; Lewandowska, N.; Lindfors, E.; Lombardi, S.; López, M.; López-Coto, R.; López-Oramas, A.; Lorenz, E.; Lozano, I.; Makariev, M.; Mallot, K.; Hose, J.; Hrupec, D.; Idec, W.; Kadenius, V.; Herrero, A.; Hildebrand, D.; Giavitto, G.; Godinović, N.; González Muñoz, A.; Gozzini, S. R.; Hadasch, D.; Hayashida, M.; Garczarczyk, M.; Garrido Terrats, D.; Gaug, M.; García López, R. J.; Font, L.; Frantzen, K.; Fruck, C.; Farina, E.; Ferenc, D.; Fonseca, M. V.; Eisenacher, D.; Elsaesser, D.; Doro, M.; Einecke, S.; Domínguez, A.; Dominis Prester, D.; Dorner, D.; De Lotto, B.; Delgado Mendez, C.; Doert, M.; Da Vela, P.; Dazzi, F.; De Angelis, A.; De Caneva, G.; Colin, P.; Colombo, E.; Contreras, J. L.; Cortina, J.; Covino, S.; Bretz, T.; Carmona, E.; Carosi, A.; Carreto Fidalgo, D.; Bonnefoy, S.; Bonnoli, G.; Borracci, F.; Blanch, O.; Bock, R. K.; Bernardini, E.; Biland, A.; Becerra González, J.; Bednarek, W.; Berger, K.; Bangale, P.; Barres de Almeida, U.; Barrio, J. A.; Aleksić, J.; Ansoldi, S.; Antonelli, L. A.; Antoranz, P.; Babic, A.; Niedzwiecki, A.; Nilsson, K.; Nishijima, K.; Nowak, N. et al.
Bibliographical reference
Astronomy and Astrophysics, Volume 567, id.A135, 15 pp.
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7
2014
Journal
Citations
57
Refereed citations
54
Description
Aims: We present a study of the very high-energy (VHE; E> 100
GeV) γ-ray emission of the blazar PKS 1424+240 observed with the
MAGIC telescopes. The primary aim of this paper is the multiwavelength
spectral characterization and modeling of this blazar, which is made
particularly interesting by the recent discovery of a lower limit of its
redshift of z ≥ 0.6 and makes it a promising candidate to be the most
distant VHE source. Methods: The source has been observed with
the MAGIC telescopes in VHE γ rays for a total observation time of
~33.6 h from 2009 to 2011. A detailed analysis of its γ-ray
spectrum and time evolution has been carried out. Moreover, we have
collected and analyzed simultaneous and quasi-simultaneous
multiwavelength data. Results: The source was marginally detected
in VHE γ rays during 2009 and 2010, and later, the detection was
confirmed during an optical outburst in 2011. The combined significance
of the stacked sample is ~7.2σ. The differential spectra measured
during the different campaigns can be described by steep power laws with
the indices ranging from 3.5 ± 1.2 to 5.0 ± 1.7. The MAGIC
spectra corrected for the absorption due to the extragalactic background
light connect smoothly, within systematic errors, with the mean spectrum
in 2009-2011 observed at lower energies by the Fermi-LAT. The
absorption-corrected MAGIC spectrum is flat with no apparent turn down
up to 400 GeV. The multiwavelength light curve shows increasing flux in
radio and optical bands that could point to a common origin from the
same region of the jet. The large separation between the two peaks of
the constructed non-simultaneous spectral energy distribution also
requires an extremely high Doppler factor if an one zone synchrotron
self-Compton model is applied. We find that a two-component synchrotron
self-Compton model describes the spectral energy distribution of the
source well, if the source is located at z ~ 0.6.
Appendix is available in electronic form at http://www.aanda.org
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