Query : 2018A&A...609A.122B

2018A&A...609A.122B - Astronomy and Astrophysics, volume 609A, 122-122 (2018/1-1)

Recollimation shocks and radiative losses in extragalactic relativistic jets.


Abstract (from CDS):

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 10–3 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.

Abstract Copyright: © ESO, 2018

Journal keyword(s): galaxies: jets - galaxies: active - radiation mechanisms: non-thermal - shock waves

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 4C 21.35 Bla 12 24 54.4583146056 +21 22 46.385507388   17.56 17.50 18.2   ~ 639 2
2 3C 279 Bla 12 56 11.1663795384 -05 47 21.528432492   18.01 17.75 15.87   ~ 2906 2

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