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http://hdl.handle.net/20.500.12386/28224
Title: | Recollimation shocks and radiative losses in extragalactic relativistic jets | Authors: | BODO, Gianluigi TAVECCHIO, Fabrizio |
Issue Date: | 2018 | Journal: | ASTRONOMY & ASTROPHYSICS | Number: | 609 | First Page: | A122 | Abstract: | We present the results of state-of-the-art simulations of recollimation shocks induced by the interaction of a relativistic jet with an external medium, including the effect of radiative losses of the shocked gas. Our simulations confirm that - as suggested by earlier semi-analytical models - the post-shock pressure loss induced by radiative losses may lead to a stationary equilibrium state characterized by a very strong focusing of the flow, with the formation of quite narrow nozzles, with cross-sectional radii as small as 10<SUP>-3</SUP> times the length scale of the jet. We also study the time-dependent evolution of the jet structure induced by a density perturbation injected at the flow base. The set-up and the results of the simulations are particularly relevant for the interpretation of the observed rapid variability of the γ-ray emission associated to flat spectrum radio quasars. In particular, the combined effects of jet focusing and Doppler beaming on the observed radiation make it possible to explain the sub-hour flaring events such as that observed in the flat specrum radio quasar PKS 1222+216 by MAGIC. | URI: | http://hdl.handle.net/20.500.12386/28224 | URL: | https://www.aanda.org/articles/aa/abs/2018/01/aa32000-17/aa32000-17.html | ISSN: | 0004-6361 | DOI: | 10.1051/0004-6361/201732000 | Bibcode ADS: | 2018A&A...609A.122B | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
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recshock.pdf | preprint | 6.17 MB | Adobe PDF | View/Open |
aa32000-17.pdf | Pdf editoriale | 15.97 MB | Adobe PDF | View/Open |
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