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Title:
A compilation of interstellar gas properties
Authors:
Myers, P. C.
Affiliation:
AA(MIT, Cambridge, Mass.)
Publication:
Astrophysical Journal, Part 1, vol. 225, Oct. 15, 1978, p. 380-389. (ApJ Homepage)
Publication Date:
10/1978
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Astronomical Spectroscopy, Gas Density, Gas Pressure, Gas Temperature, Interstellar Gas, Abundance, Atomic Spectra, Clouds, H Ii Regions, Molecular Spectra
DOI:
10.1086/156500
Bibliographic Code:
1978ApJ...225..380M

Abstract

A compilation of observed interstellar gas properties is presented based on over 200 observations of coronal gas, intercloud gas, diffuse clouds, dark clouds, Bok globules, H II regions, and molecular clouds associated with H II regions. The mean and standard deviation in particle number density (n), gas temperature (T), and pressure (P/k) are computed for each gas type, while the mean and standard deviation in scale length and mass are calculated for each discrete cloud type. A plot of log T vs log n is graphed for the compiled data, and four portions of the resulting diagram are discussed in terms of the reliability of apparent trends, implications of pressure equilibrium, and constraints on cloud-heating mechanisms.

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