Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/130797
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dc.contributor.author | Abdalla, H. | - |
dc.contributor.author | Adam, R. | - |
dc.contributor.author | Aharonian, F. | - |
dc.contributor.author | Ait Benkhali, F. | - |
dc.contributor.author | Angüner, E.O. | - |
dc.contributor.author | Arcaro, C. | - |
dc.contributor.author | Armand, C. | - |
dc.contributor.author | Armstrong, T. | - |
dc.contributor.author | Ashkar, H. | - |
dc.contributor.author | Backes, M. | - |
dc.contributor.author | Baghmanyan, V. | - |
dc.contributor.author | Barbosa Martins, V. | - |
dc.contributor.author | Barnacka, A. | - |
dc.contributor.author | Barnard, M. | - |
dc.contributor.author | Becherini, Y. | - |
dc.contributor.author | Berge, D. | - |
dc.contributor.author | Bernlöhr, K. | - |
dc.contributor.author | Bi, B. | - |
dc.contributor.author | Böttcher, M. | - |
dc.contributor.author | Boisson, C. | - |
dc.contributor.author | et al. | - |
dc.date.issued | 2021 | - |
dc.identifier.citation | Astronomy and Astrophysics: a European journal, 2021; 648:A23-1-A23-22 | - |
dc.identifier.issn | 0004-6361 | - |
dc.identifier.issn | 1432-0746 | - |
dc.identifier.uri | http://hdl.handle.net/2440/130797 | - |
dc.description.abstract | The flat spectrum radio quasar (FSRQ) PKS 1510−089 is known for its complex multiwavelength behaviour and it is one of only a few FSRQs detected in very-high-energy (VHE, E > 100 GeV) γ rays. The VHE γ-ray observations with H.E.S.S. and MAGIC in late May and early June 2016 resulted in the detection of an unprecedented flare, which revealed, for the first time, VHE γ-ray intranight variability for this source. While a common variability timescale of 1.5 h has been found, there is a significant deviation near the end of the flare, with a timescale of ∼20 min marking the cessation of the event. The peak flux is nearly two orders of magnitude above the low-level emission. For the first time, a curvature was detected in the VHE γ-ray spectrum of PKS 1510–089, which can be fully explained by the absorption on the part of the extragalactic background light. Optical R-band observations with ATOM revealed a counterpart of the γ-ray flare, even though the detailed flux evolution differs from the VHE γ-ray light curve. Interestingly, a steep flux decrease was observed at the same time as the cessation of the VHE γ-ray flare. In the high-energy (HE, E > 100 MeV) γ-ray band, only a moderate flux increase was observed with Fermi-LAT, while the HE γ-ray spectrum significantly hardens up to a photon index of 1.6. A search for broad-line region (BLR) absorption features in the γ-ray spectrum indicates that the emission region is located outside of the BLR. Radio very-long-baseline interferometry observations reveal a fast-moving knot interacting with a standing jet feature around the time of the flare. As the standing feature is located ∼50 pc from the black hole, the emission region of the flare may have been located at a significant distance from the black hole. If this is indeed a true correlation, the VHE γ rays must have been produced far down in the jet, where turbulent plasma crosses a standing shock. | - |
dc.description.statementofresponsibility | H. Abdalla … P. de Wilt … S. Einecke … K. Feijen … M. Filipovic … G. Rowell … [et al.] (the H.E.S.S. Collaboration and the MAGIC Collaboration). | - |
dc.language.iso | en | - |
dc.publisher | EDP Sciences | - |
dc.rights | © H.E.S.S. and MAGIC Collaborations 2021 Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. | - |
dc.source.uri | http://dx.doi.org/10.1051/0004-6361/202038949 | - |
dc.title | H.E.S.S. and MAGIC observations of a sudden cessation of a very-high-energy γ -ray flare in PKS 1510-089 in May 2016 | - |
dc.title.alternative | H.E.S.S. and MAGIC observations of a sudden cessation of a very-high-energy gamma -ray flare in PKS 1510-089 in May 2016 | - |
dc.type | Journal article | - |
dc.identifier.doi | 10.1051/0004-6361/202038949 | - |
dc.relation.grant | ARC | - |
pubs.publication-status | Published | - |
dc.identifier.orcid | Einecke, S. [0000-0001-9687-8237] | - |
dc.identifier.orcid | Feijen, K. [0000-0003-1476-3714] | - |
Appears in Collections: | Aurora harvest 8 Physics publications |
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hdl_130797.pdf | Published Version | 2.31 MB | Adobe PDF | View/Open |
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