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Record 9 of 395
Statistical time-dependent model for the interstellar gas
External Online Source: doi:10.1086/152768
Author and Affiliation:
Gerola, H.
Kafatos, M.(Joint Institute for Laboratory Astrophysics, Boulder, Colo., NASA, Goddard Space Flight Center)
Mccray, R.(Joint Institute for Laboratory Astrophysics, Colorado, University)
Abstract: We present models for temperature and ionization structure of low, uniform-density (approximately 0.3 per cu cm) interstellar gas in a galactic disk which is exposed to soft X rays from supernova outbursts occurring randomly in space and time. The structure was calculated by computing the time record of temperature and ionization at a given point by Monte Carlo simulation. The calculation yields probability distribution functions for ionized fraction, temperature, and their various observable moments. These time-dependent models predict a bimodal temperature distribution of the gas that agrees with various observations. Cold regions in the low-density gas may have the appearance of clouds in 21-cm absorption. The time-dependent model, in contrast to the steady-state model, predicts large fluctuations in ionization rate and the existence of cold (approximately 30 K), ionized (ionized fraction equal to about 0.1) regions.
Publication Date: Apr 01, 1974
Document ID:
19740047290
(Acquired Dec 04, 1995)
Accession Number: 74A30040
Subject Category: SPACE SCIENCES
Document Type: Journal Article
Publication Information: Astrophysical Journal; 189; Apr. 1
Publisher Information: United States
Financial Sponsor: NASA; United States
Description: 12p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: ASTRONOMICAL MODELS; GAS IONIZATION; GAS TEMPERATURE; INTERSTELLAR GAS; TIME DEPENDENCE; X RAYS; GAS DENSITY; MATHEMATICAL MODELS; PROBABILITY DENSITY FUNCTIONS; STATISTICAL ANALYSIS; SUPERNOVAE
Imprint And Other Notes: Astrophysical Journal, vol. 189, Apr. 1, 1974, pt. 1, p. 55-66. Research supported by the Consejo Nacional de Investigaciones Cientificas y Tecnicas of Argentina and NSF.
Miscellaneous Notes: 1974, pt. 1, p. 55-66. Research supported by the Consejo Nacional de Investigaciones Cientificas y Tecnicas of Argentina and NSF
Availability Source: Other Sources
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