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Energy Source for Shingle‐like Structures in Spiral‐arms
Author(s) -
House F.,
SchmidtKaler T H.
Publication year - 1976
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.19762970205
Subject(s) - instability , shingles , physics , astrophysics , population , wavelength , spiral (railway) , spiral galaxy , optics , medicine , mechanics , galaxy , virus , virology , engineering , mechanical engineering , environmental health
The filaments or shingles observed in neighbouring spiral‐arms were found in a previous paper to have a wavelength of ˜ 1.3 kpc. The life‐time of the shingles was estimated at ˜ 10 8 years. The energy source to regenerate the shingles is sought in terms of a JEANS ‐type instability modified by a two stream instability between population I and disk material. From the dispersion relation it is found that an instability of this type occurs at a critical‐wavelength of 1.9 kpc.