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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: 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

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