Bibcode
Ahnen, M. L.; Ansoldi, S.; Antonelli, L. A.; Antoranz, P.; Babic, A.; Banerjee, B.; Bangale, P.; Barres de Almeida, U.; Barrio, J. A.; Bednarek, W.; Bernardini, E.; Biasuzzi, B.; Biland, A.; Blanch, O.; Bonnefoy, S.; Bonnoli, G.; Borracci, F.; Bretz, T.; Carmona, E.; 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.; Delgado Mendez, C.; Di Pierro, F.; Dominis Prester, D.; Dorner, D.; Doro, M.; Einecke, S.; Eisenacher Glawion, D.; Elsaesser, D.; 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.; Guberman, 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.; López, M.; López-Coto, R.; López-Oramas, A.; Lorenz, E.; 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.; Nishijima, K.; Noda, K.; Orito, R.; Overkemping, A. et al.
Bibliographical reference
The Astrophysical Journal Letters, Volume 815, Issue 2, article id. L23, 8 pp. (2015).
Advertised on:
12
2015
Citations
88
Refereed citations
65
Description
The flat-spectrum radio quasar PKS 1441+25 at a redshift of z = 0.940 is
detected between 40 and 250 GeV with a significance of 25.5σ using
the MAGIC telescopes. Together with the gravitationally lensed blazar
QSO B0218+357 (z = 0.944), PKS 1441+25 is the most distant very high
energy (VHE) blazar detected to date. The observations were triggered by
an outburst in 2015 April seen at GeV energies with the Large Area
Telescope on board Fermi. Multi-wavelength observations suggest a
subdivision of the high state into two distinct flux states. In the band
covered by MAGIC, the variability timescale is estimated to be 6.4
± 1.9 days. Modeling the broadband spectral energy distribution
with an external Compton model, the location of the emitting region is
understood as originating in the jet outside the broad-line region (BLR)
during the period of high activity, while being partially within the BLR
during the period of low (typical) activity. The observed VHE spectrum
during the highest activity is used to probe the extragalactic
background light at an unprecedented distance scale for ground-based
gamma-ray astronomy.
Related projects
Particle Astrophysics
The members of the Particle Astrophysics Group of the IAC participate actively in three large international collaborations of high-energy astrophysics: AMS-02 (Alpha Magnetic Spectrometer), the Cherenkov radiation telescopes MAGIC I and II and the Cherenkov Telescope Array Observatory ( CTAO). We also participate in the ASTRI mini-array, the gamma
Mónica Luisa
Vázquez Acosta