Hydromagnetic break-up of bridges and jets into aligned objects |
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Authors: | P S Wesson Aksel Lermann |
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Institution: | (1) Dept. of Physics, Queen's University, Kingston, Ontario;(2) Institute of Astronomy, Cambridge University, England;(3) University of Oslo, Norway |
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Abstract: | It is shown that a cylindrical plasma column supporting a longitudinal fieldB
z
and an azimuthal fieldB
has a fastest-growing mode in whichkR
01 (k=wave number,R
0=radius of the column). If we assume that plasma is ejected from a galaxy to form a jet, filament or bridge of length 5 kpc,R
00.5 kpc, density 10–24 gm cm–3 with a dragged-out field of strengthB
z
10–5 Gauss (from a parent field 10–6 Gauss), such a column must eventually fragment by the action of a hydromagnetic instability, breaking up into a number 10 of regularly-spaced condensations. It is, therefore, predicted that features like the M87 jet should show incipient nucleation with 3–10 knots, and that periodically-spaced objects of the type noted by Arp may have resulted from the action of such an instability. |
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Keywords: | |
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