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Astrophysical Jets - Proceedings of an International Workshop held in Torino, Italy, October 7-9, 1982 (Hardcover, 1983)
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Astrophysical Jets - Proceedings of an International Workshop held in Torino, Italy, October 7-9, 1982 (Hardcover, 1983)
Series: Astrophysics and Space Science Library, 103
Expected to ship within 10 - 15 working days
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Attilio Ferrari I want to recall here the basic points I raised at
the beginning of the Workshop as the main targets of discussion (in
the name of the Scientific Committee). I attempted to focus the
attention of participants on the fact that, in many instances, we
tend to discuss jets in terms of simple physics, more or less as
one did at the time extragalactic radio sources were discovered:
for instance, we still use equipartition arguments. However, we
must realize that processes in jets, leading to their morphologies
and energetics clearly depend on complex plasma phenomena.
Therefore, the same standard arguments used to derive
characteristic parameters should be questioned; some of the
speakers were invited to attempt a critical analysis of this point,
an~ in fact I believe that this "inquisitive attitude" was actually
present all along the Workshop. Observers were asked to choose the
parameters to be used in a statistical sample of jets. For this
they were urged, first of all, to distinguish between primary and
secondary features. For instance, are knots and wiggles common to
all jets? Are relativistic flow velocities expected in all active
nuclei? Are jets denser or lighter than the external medium? On the
theoretical side I asked to discuss whether or not existing models
are in accordance with the limited statistical sample that we have
today. And which should be the lines of development to be pursued
first, and to what extent.
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