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dc.contributor.author | D.; Engelkemeier | |
dc.contributor.author | M.; Fallah Ramazani | |
dc.contributor.author | M. L.; Ansoldi | |
dc.contributor.author | M.; Poutanen | |
dc.contributor.author | E.; Berti | |
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dc.contributor.author | S.; Antonelli | |
dc.contributor.author | A.; Blanch | |
dc.contributor.author | J.; Hrupec | |
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dc.contributor.author | P.; Arcaro | |
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dc.date.accessioned | 2022-10-28T13:24:26Z | |
dc.date.available | 2022-10-28T13:24:26Z | |
dc.identifier.uri | https://www.utupub.fi/handle/10024/164960 | |
dc.description.abstract | <p>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. <br /> 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. <br /> 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. <br /> 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.
<br /></p> | |
dc.language.iso | en | |
dc.publisher | EDP Science | |
dc.title | Detection of very high energy gamma-ray emission from the gravitationally lensed blazar QSO B0218+357 with the MAGIC telescopes | |
dc.identifier.urn | URN:NBN:fi-fe2021042716197 | |
dc.relation.volume | 595 | |
dc.contributor.organization | fi=Suomen ESO-keskus, yhteiset|en=Finnish Centre for Astronomy with ESO - FINCA| | |
dc.contributor.organization | fi=Tuorlan observatorio|en=Tuorla Observatory| | |
dc.contributor.organization-code | 2606705 | |
dc.contributor.organization-code | 2609700 | |
dc.converis.publication-id | 18200630 | |
dc.converis.url | https://research.utu.fi/converis/portal/Publication/18200630 | |
dc.identifier.eissn | 1432-0746 | |
dc.identifier.jour-issn | 0004-6361 | |
dc.okm.affiliatedauthor | Poutanen, Juri | |
dc.okm.affiliatedauthor | Nilsson, Kari | |
dc.okm.affiliatedauthor | Sillanpää, Aimo | |
dc.okm.affiliatedauthor | Lindfors, Elina | |
dc.okm.affiliatedauthor | Takalo, Leo | |
dc.okm.affiliatedauthor | Fallah Ramazani, Vandad | |
dc.okm.discipline | 115 Astronomy and space science | en_GB |
dc.okm.discipline | 115 Avaruustieteet ja tähtitiede | fi_FI |
dc.okm.internationalcopublication | international co-publication | |
dc.okm.internationality | International publication | |
dc.okm.type | Journal article | |
dc.publisher.country | France | en_GB |
dc.publisher.country | Ranska | fi_FI |
dc.publisher.country-code | FR | |
dc.relation.articlenumber | A98 | |
dc.relation.doi | 10.1051/0004-6361/201629461 | |
dc.relation.ispartofjournal | Astronomy and Astrophysics | |
dc.year.issued | 2016 | |