Hydromagnetic Break-Up of Bridges and Jets into Aligned Objects

Details Hydromagnetic Break-Up of Bridges and Jets into Aligned Objects Hydromagnetic Break-Up of Bridges and Jets into Aligned Objects

Jan 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977ap%26ss..46...51w&link_type=abstract

Astrophysics and Space Science, Volume 46, Issue 1, pp.51-60

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

It is shown that a cylindrical plasma column supporting a longitudinal fieldB z and an azimuthal fieldB ϕ has a fastest-growing mode in whichkR 0≈1 (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 0≃0.5 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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