Computer Science – Numerical Analysis
Scientific paper
May 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....66..211m&link_type=abstract
Astronomy and Astrophysics, vol. 66, no. 1-2, May 1978, p. 211-224.
Computer Science
Numerical Analysis
3
Diffuse Radiation, Galactic Radiation, Luminous Intensity, Milky Way Galaxy, Cosmic Dust, Interstellar Matter, Nebulae, Night Sky, Numerical Analysis, Optical Thickness
Scientific paper
Fluctuations of the diffuse galactic light (DGL) are investigated both as a separate component and in connection with fluctuations of the total brightness of the Milky Way. A model is adopted in which the optical thicknesses of the several clouds intersecting the line of sight are independent random variables with the same probability distribution, the total number of clouds along the line of sight is a random variable governed by the Poisson distribution, and two kinds of cloud are assumed. The mean intensity and mean-square deviation of the DGL are analyzed. It is shown that the expressions deduced by Chandrasekhar and Muench (1950) for the mean and mean square of integrated starlight (ISL) can be derived by a direct elementary method in the present case. A formula for the covariance of the DGL and ISL is obtained, and the correlation between the DGL and ISL is examined. The fluctuations of the DGL are calculated as a function of galactic latitude for different grain and cloud parameters, and the results are compared with the very sparse observational data on DGL fluctuations.
Mattila Kalevi
Scheffler H.
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