New Temperatures of Diffuse Interstellar Gas: Thermally Unstable Gas
Astrophysics
2009-11-06 v1
Abstract
We present new Arecibo 21-cm line measurements of the temperatures of interstellar gas. Our temperatures for the Cold Neutral Medium (CNM) are significantly lower than previous single-dish results and in very good accord with theoretical models. For warm gas at T > 500 K, we find a significant fraction of gas (>47%) to lie in the thermally unstable region 500 ---> 5000 K; moreover, about 60% of all the neutral atomic gas has T > 500 K. Large amounts of thermally unstable gas are not allowed in theoretical models of the global interstellar medium.
Keywords
Cite
@article{arxiv.astro-ph/0103126,
title = {New Temperatures of Diffuse Interstellar Gas: Thermally Unstable Gas},
author = {Carl Heiles},
journal= {arXiv preprint arXiv:astro-ph/0103126},
year = {2009}
}
Comments
6 pages, 2 figures, accepted by ApJ Letters