Detection of very high energy gamma-ray emission from the gravitationally lensed blazar QSO B0218+357 with the MAGIC telescopes
L.; Marcote; J. E.; Will; J. R.; Reichardt; B.; Biland; L.; Paiano; R.; Paredes; R.; Moralejo; R.; Majumdar; D.; García López; B.; de Oña Wilhelmi; J.; La Barbera; D.; Guberman; C.; Galindo; J. M.; Paredes-Fortuny; Ahnen; X.; Pedaletti; K.; Nishijima; S.; Longo; A.; Hayashida; A.; Vanzo; G.; Manganaro; Y.; Kubo; A.; De Lotto; P.; Colombo; M.; Garrido Terrats; I.; Sobczynska; S.; Eisenacher Glawion; T.; Treves; A.; Clavero; V.; Niedzwiecki; M. V.; Font; G.; Borracci; O.; Bonnefoy; T.; Satalecka; M.; Mallot; L.; Frantzen; L. A.; Antoranz; M.; Giammaria; K.; Maneva; S.; Palacio; D.; Hahn; M.; Martínez; R.; Desiante; F.; López; P. G.; Prandini; E.; Nakajima; D.; Stamerra; L.; Tavecchio; T.; Takalo; D.; Engelkemeier; M.; Fallah Ramazani; M. L.; Ansoldi; M.; Poutanen; E.; Berti; J. A.; Becerra González; G.; Peresano; R.; Colin; K.; Maraschi; J. L.; Cortina; A.; Fidalgo; M.; López-Coto; E.; Lombardi; P.; Godinović; M.; Surić; M.; Herrera; A.; Lelas; E.; Di Pierro; A.; Biasuzzi; A.; Banerjee; U.; Miranda; T.; Shore; D.; Menzel; L.; Persic; M.; Perri; T.; Buson; K.; Nogués; A.; Moretti; G.; Idec; S. N.; Sillanpää; J. M.; Mirzoyan; P.; Barres de Almeida; M. H.; Zanin; C.; Babic; J.; Covino; K.; Schroeder; D.; Doro; N.; Gora; D.; Gaug; J.; Saito; W.; Kodani; M.; Mannheim; M.; Domínguez; U.; Barrio; A.; Strzys; D.; Hadasch; A.; Dominis Prester; D.; Fonseca; B.; Mariotti; D.; Paoletti; A.; Nievas Rosillo; M.; Wu; K.; Fruck; A.; Sitarek; S.; Carosi; D.; Lindfors; D. F.; Toyama; R. J.; Garczarczyk; E.; Puljak; S.; Bonnoli; E.; Contreras; F.; De Angelis; R.; D.; Dorner; K.; Noda; K.; Konno; I.; Ward; P.; Dazzi; V.; Fernández-Barral; F.; Temnikov; J.; Snidaric; M.; Mazin; I.; Garcia; W.; Ribó; P.; Terzić; D.; Elsaesser; D.; Hughes; A.; Chatterjee; M.; Rico; G.; Verguilov; M.; Einecke; V.; Vovk; M.; Paneque; H.; Kushida; W.; Bernardini; S.; Da Vela; J.; Bednarek; J.; Prada Moroni; D.; Neustroev; D.; Teshima; M.; Torres; M.; Nilsson; S.; Antonelli; A.; Blanch; J.; Hrupec; P.; Makariev; P.; Arcaro; I.; Rhode; T.; Tescaro; S.; Schweizer; J.; Hose; B.; Bangale; F.; Bretz; F.; Doert; J.; Palatiello
https://urn.fi/URN:NBN:fi-fe2021042716197
Tiivistelmä
Context. QSO B0218+357 is a gravitationally lensed blazar located at a
redshift of 0.944. The gravitational lensing splits the emitted
radiation into two components that are spatially indistinguishable by
gamma-ray instruments, but separated by a 10-12 day delay. In July 2014,
QSO B0218+357 experienced a violent flare observed by the Fermi-LAT and
followed by the MAGIC telescopes.
Aims: The spectral energy
distribution of QSO B0218+357 can give information on the energetics of
z 1 very high energy gamma-ray sources. Moreover the gamma-ray
emission can also be used as a probe of the extragalactic background
light at z 1.
Methods: MAGIC performed observations of QSO
B0218+357 during the expected arrival time of the delayed component of
the emission. The MAGIC and Fermi-LAT observations were accompanied by
quasi-simultaneous optical data from the KVA telescope and X-ray
observations by Swift-XRT. We construct a multiwavelength spectral
energy distribution of QSO B0218+357 and use it to model the source. The
GeV and sub-TeV data obtained by Fermi-LAT and MAGIC are used to set
constraints on the extragalactic background light.
Results: Very
high energy gamma-ray emission was detected from the direction of QSO
B0218+357 by the MAGIC telescopes during the expected time of arrival of
the trailing component of the flare, making it the farthest very high
energy gamma-ray source detected to date. The observed emission spans
the energy range from 65 to 175 GeV. The combined MAGIC and Fermi-LAT
spectral energy distribution of QSO B0218+357 is consistent with current
extragalactic background light models. The broadband emission can be
modeled in the framework of a two-zone external Compton scenario, where
the GeV emission comes from an emission region in the jet, located
outside the broad line region.
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