Other
Scientific paper
Sep 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000kfnts...3..125d&link_type=abstract
Kinematika i Fizika Nebesnykh Tel, Suppl, no. 3, p. 125-129
Other
Scientific paper
We discuss some peculiar structures in the interstellar medium of the Milky Way and other galaxies which have not been explained. Two are associated with supernova remnants and a third concerns the temperature and density structure of cold interstellar gas. Several supernova remnants have breakouts or apparent jets emanating from spots in their shells. It remains unclear if the shapes of these features are controlled by ejected material or structures inherent in the surroundings. The filaments in individual supernova remnants show a great variety of shapes -- some appear as if they can be represented by sheets seen from various angles while others appear more like sections of small bubbles centered near the periphery of the shell. In these dense filaments the magnetic field may be compressed enough to control the motion of the material in the plasma and observed structures. Observations at low radio frequencies of high Rydberg state recombination lines of carbon in both emission and absorption can provide valuable information on the temperature and density of cold gas in the interstellar medium but current data are limited by poor resolution which does not allow separation of several components within the beam along a given line of sight. Newly proposed radio telescopes will improve the resolution and give a better picture of this gas distribution.
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