Xuhui Chen, Ritaban Chatterjee, Haocheng Zhang, Martin Pohl, Giovanni Fossati, Markus Boettcher, Charles D. Bailyn, Erin W. Bonning, Michelle Buxton, Paolo Coppi, Jedidah Isler, Laura Maraschi, Meg Urry
- We perform time-dependent, spatially resolved simulations of blazar emission to evaluate several flaring scenarios related to magnetic-field amplification and enhanced particle acceleration. The code explicitly accounts for light-travel-time effects and is applied to flares observed in the flat spectrum radio quasar (FSRQ) PKS 0208-512, which show optical/gamma-ray correlation at some times, but orphan optical flares at other times. Changes in both the magnetic field and the particle acceleration efficiency are explored as causes of flares. Generally, external Compton (EC) emission appears to describe the available data better than a synchrotron self-Compton (SSC) scenario, and in particular orphan optical flares are difficult to produce in the SSC framework. X-ray soft-excesses, gamma-ray spectral hardening, and the detections at very high energies of certain FSRQs during flares find natural explanations in the EC scenario with particle acceleration change. Likewise, optical flares with/without gamma-ray counterparts can be explainedWe perform time-dependent, spatially resolved simulations of blazar emission to evaluate several flaring scenarios related to magnetic-field amplification and enhanced particle acceleration. The code explicitly accounts for light-travel-time effects and is applied to flares observed in the flat spectrum radio quasar (FSRQ) PKS 0208-512, which show optical/gamma-ray correlation at some times, but orphan optical flares at other times. Changes in both the magnetic field and the particle acceleration efficiency are explored as causes of flares. Generally, external Compton (EC) emission appears to describe the available data better than a synchrotron self-Compton (SSC) scenario, and in particular orphan optical flares are difficult to produce in the SSC framework. X-ray soft-excesses, gamma-ray spectral hardening, and the detections at very high energies of certain FSRQs during flares find natural explanations in the EC scenario with particle acceleration change. Likewise, optical flares with/without gamma-ray counterparts can be explained by different allocations of energy between the magnetization and particle acceleration, which may be related to the orientation of the magnetic field relative to the jet flow. We also calculate the degree of linear polarization and polarization angle as a function of time for a jet with helical magnetic field. Tightening of the magnetic helix immediately downstream of the jet perturbations, where flares occur, can be sufficient to explain the increases in the degree of polarization and a rotation by a parts per thousand yen180A degrees of the observed polarization angle, if light-travel-time effects are properly considered.…
MetadatenVerfasserangaben: | Xuhui Chen, Ritaban Chatterjee, Haocheng Zhang, Martin PohlORCiDGND, Giovanni Fossati, Markus Boettcher, Charles D. Bailyn, Erin W. Bonning, Michelle Buxton, Paolo Coppi, Jedidah Isler, Laura Maraschi, Meg Urry |
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DOI: | https://doi.org/10.1093/mnras/stu713 |
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ISSN: | 0035-8711 |
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ISSN: | 1365-2966 |
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Titel des übergeordneten Werks (Englisch): | Monthly notices of the Royal Astronomical Society |
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Verlag: | Oxford Univ. Press |
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Verlagsort: | Oxford |
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Publikationstyp: | Wissenschaftlicher Artikel |
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Sprache: | Englisch |
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Jahr der Erstveröffentlichung: | 2014 |
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Erscheinungsjahr: | 2014 |
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Datum der Freischaltung: | 27.03.2017 |
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Freies Schlagwort / Tag: | galaxies: active; galaxies: jets; quasars: individual: PKS 0208-512; radiation mechanisms: non-thermal |
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Band: | 441 |
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Ausgabe: | 3 |
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Seitenanzahl: | 12 |
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Erste Seite: | 2188 |
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Letzte Seite: | 2199 |
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Fördernde Institution: | Helmholtz Alliance for Astroparticle Physics HAP - Initiative and
Networking Fund of the Helmholtz Association; NASA [NNX12AP20G,
NNX12AE43G]; LANL/LDRD programme; DoE/Office of Fusion Energy Science
through CMSO; Department of Science and Technology of South Africa;
South African Research Chair Initiative of the National Research
Foundation |
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Organisationseinheiten: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
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Peer Review: | Referiert |
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