HESS and MAGIC observations of a sudden cessation of a very-high-energy <em>γ</em>-ray flare in PKS 1510-089 in May 2016
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 detect...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2021 |
| País: | España |
| Institución: | Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| Repositorio: | Recercat. Dipósit de la Recerca de Catalunya |
| OAI Identifier: | oai:recercat.cat:2445/221093 |
| Acceso en línea: | https://hdl.handle.net/2445/221093 |
| Access Level: | acceso abierto |
| Palabra clave: | Galàxies actives Radiació Quàsars Active galaxies Radiation Quasars |
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HESS and MAGIC observations of a sudden cessation of a very-high-energy <em>γ</em>-ray flare in PKS 1510-089 in May 2016Cerruti, MatteoMolina, EdgarParedes i Poy, Josep MariaRibó Gomis, MarcMAGIC CollaborationGalàxies activesRadiacióQuàsarsActive galaxiesRadiationQuasarsThe 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 γrays must have been produced far down in the jet, where turbulent plasma crosses a standing shock.EDP Sciences2025202520212025info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersion22 p.application/pdfhttps://hdl.handle.net/2445/221093Articles publicats en revistes (Física Quàntica i Astrofísica)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésReproducció del document publicat a: https://doi.org/10.1051/0004-6361/202038949Astronomy & Astrophysics, 2021, vol. 648https://doi.org/10.1051/0004-6361/202038949(c) The European Southern Observatory (ESO), 2021info:eu-repo/semantics/openAccessoai:recercat.cat:2445/2210932026-05-29T05:05:01Z |
| dc.title.none.fl_str_mv |
HESS and MAGIC observations of a sudden cessation of a very-high-energy <em>γ</em>-ray flare in PKS 1510-089 in May 2016 |
| title |
HESS and MAGIC observations of a sudden cessation of a very-high-energy <em>γ</em>-ray flare in PKS 1510-089 in May 2016 |
| spellingShingle |
HESS and MAGIC observations of a sudden cessation of a very-high-energy <em>γ</em>-ray flare in PKS 1510-089 in May 2016 Cerruti, Matteo Galàxies actives Radiació Quàsars Active galaxies Radiation Quasars |
| title_short |
HESS and MAGIC observations of a sudden cessation of a very-high-energy <em>γ</em>-ray flare in PKS 1510-089 in May 2016 |
| title_full |
HESS and MAGIC observations of a sudden cessation of a very-high-energy <em>γ</em>-ray flare in PKS 1510-089 in May 2016 |
| title_fullStr |
HESS and MAGIC observations of a sudden cessation of a very-high-energy <em>γ</em>-ray flare in PKS 1510-089 in May 2016 |
| title_full_unstemmed |
HESS and MAGIC observations of a sudden cessation of a very-high-energy <em>γ</em>-ray flare in PKS 1510-089 in May 2016 |
| title_sort |
HESS and MAGIC observations of a sudden cessation of a very-high-energy <em>γ</em>-ray flare in PKS 1510-089 in May 2016 |
| dc.creator.none.fl_str_mv |
Cerruti, Matteo Molina, Edgar Paredes i Poy, Josep Maria Ribó Gomis, Marc MAGIC Collaboration |
| author |
Cerruti, Matteo |
| author_facet |
Cerruti, Matteo Molina, Edgar Paredes i Poy, Josep Maria Ribó Gomis, Marc MAGIC Collaboration |
| author_role |
author |
| author2 |
Molina, Edgar Paredes i Poy, Josep Maria Ribó Gomis, Marc MAGIC Collaboration |
| author2_role |
author author author author |
| dc.subject.none.fl_str_mv |
Galàxies actives Radiació Quàsars Active galaxies Radiation Quasars |
| topic |
Galàxies actives Radiació Quàsars Active galaxies Radiation Quasars |
| description |
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 γrays must have been produced far down in the jet, where turbulent plasma crosses a standing shock. |
| publishDate |
2021 |
| dc.date.none.fl_str_mv |
2021 2025 2025 2025 |
| dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
| format |
article |
| status_str |
publishedVersion |
| dc.identifier.none.fl_str_mv |
https://hdl.handle.net/2445/221093 |
| url |
https://hdl.handle.net/2445/221093 |
| dc.language.none.fl_str_mv |
Inglés |
| language_invalid_str_mv |
Inglés |
| dc.relation.none.fl_str_mv |
Reproducció del document publicat a: https://doi.org/10.1051/0004-6361/202038949 Astronomy & Astrophysics, 2021, vol. 648 https://doi.org/10.1051/0004-6361/202038949 |
| dc.rights.none.fl_str_mv |
(c) The European Southern Observatory (ESO), 2021 info:eu-repo/semantics/openAccess |
| rights_invalid_str_mv |
(c) The European Southern Observatory (ESO), 2021 |
| eu_rights_str_mv |
openAccess |
| dc.format.none.fl_str_mv |
22 p. application/pdf |
| dc.publisher.none.fl_str_mv |
EDP Sciences |
| publisher.none.fl_str_mv |
EDP Sciences |
| dc.source.none.fl_str_mv |
Articles publicats en revistes (Física Quàntica i Astrofísica) reponame:Recercat. Dipósit de la Recerca de Catalunya instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
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Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
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Recercat. Dipósit de la Recerca de Catalunya |
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Recercat. Dipósit de la Recerca de Catalunya |
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