دورية أكاديمية
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
| العنوان: | 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 |
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| المؤلفون: | MAGIC Collaboration |
| المساهمون: | Metsähovi Radio Observatory, Department of Electronics and Nanoengineering, Anne Lähteenmäki Group, Aalto-yliopisto, Aalto University |
| بيانات النشر: | EDP SCIENCES |
| سنة النشر: | 2021 |
| المجموعة: | Aalto University Publication Archive (Aaltodoc) / Aalto-yliopiston julkaisuarkistoa |
| مصطلحات موضوعية: | Galaxies: Active, Quasars: Individual: Pks 1510-089, Radiation mechanisms: Non-thermal, Relativistic processes |
| الوصف: | 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. ; Peer reviewed |
| نوع الوثيقة: | article in journal/newspaper |
| وصف الملف: | application/pdf |
| اللغة: | English |
| تدمد: | 0004-6361 1432-0746 |
| العلاقة: | Astronomy and Astrophysics; Volume 648; MAGIC Collaboration 2021, ' 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 ', Astronomy and Astrophysics, vol. 648, A23 . https://doi.org/10.1051/0004-6361/202038949Test; PURE UUID: 46b23dc6-dbcd-4c0d-bd55-0ea4848a42f3; PURE ITEMURL: https://research.aalto.fi/en/publications/46b23dc6-dbcd-4c0d-bd55-0ea4848a42f3Test; PURE LINK: http://www.scopus.com/inward/record.url?scp=85104001652&partnerID=8YFLogxKTest; PURE FILEURL: https://research.aalto.fi/files/62232263/Abdalla_Hess_magic_collaboration.pdfTest; https://aaltodoc.aalto.fi/handle/123456789/107104Test; URN:NBN:fi:aalto-202104286388 |
| DOI: | 10.1051/0004-6361/202038949 |
| الإتاحة: | https://doi.org/10.1051/0004-6361/202038949Test https://aaltodoc.aalto.fi/handle/123456789/107104Test |
| حقوق: | openAccess |
| رقم الانضمام: | edsbas.E1D7C619 |
| قاعدة البيانات: | BASE |
Full Text Finder | تدمد: | 00046361 14320746 |
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| DOI: | 10.1051/0004-6361/202038949 |