Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010arep...54..133m&link_type=abstract
Astronomy Reports, Volume 54, Issue 2, pp.133-138
Astronomy and Astrophysics
Astronomy
Scientific paper
We consider perturbations in interstellar gas excited by the gravitational field of the spiral-density wave that is responsible for the Galactic arms, taking into account thermal effects. Under the conditions of fairly efficient cooling, the reaction of the gas to the perturbing field is non-trivial: the thickness of the gaseous layer is reduced in the region of the Galactic disk where the density of the gas is enhanced. We call this effect “self-focusing,” and explain it using observational results for the Galactic radio emission in the 21 cm line. Under our assumptions, we find the control parameter ( δ) governing the relationship between perturbations of the thickness of the gaseous disk and the gas density in the vicinity of the Galactic equator, i.e., this parameter shows whether the correlation between these quantities is positive or negative, and provides important additional information on the thermal properties of the medium. It can be used as a diagnostic in joint studies of Galactic structure and large-scale features of the interstellar gas. Estimates for the typical Galactic parameters show that the effect of self-focusing should be clearly manifest in the Galaxy.
Mishurov Yu. N.
Ponomareva A. A.
No associations
LandOfFree
The phenomenon of ``self-focusing'' in the gaseous disk of the Galaxy does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The phenomenon of ``self-focusing'' in the gaseous disk of the Galaxy, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The phenomenon of ``self-focusing'' in the gaseous disk of the Galaxy will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1310177