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Radio astronomy Explorer-1 observations of the Gum nebulaComplicating factors in the spectrum analysis of the Gum nebula are discussed. These include accounting for the spectrum of supernova remnants in the direction of the nebula, the different absorption laws for radiation from beyond and within the nebula, and the Razin effect. This last results in a low frequency cutoff to the spectrum of synchrotron radiation by particles in a thermal plasma. These factors cause the observer to overestimate the amount of absorption occurring in the nebula. Data from the Explorer 38 satellite are presented for 3.93 and 6.55 MHz. Average optical depth for the nebula at 4 MHz was calculated.
Document ID
Document Type
Conference Paper
Alexander, J. K. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 6, 2013
Publication Date
September 1, 1971
Publication Information
Publication: The Gum Nebula and Related Probl.
Subject Category
Distribution Limits
Work of the US Gov. Public Use Permitted.

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NameType 19720004106.pdf STI

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IDRelationTitle19720004101Analytic PrimaryThe Gum nebula and related problems