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The Galactic Far-UV Background: Correlations with Gas and Dust at High Galactic Latitudes

Published online by Cambridge University Press:  08 February 2017

James Lequeux
James Lequeux*
Affiliation:
Radioastronomie, ENS 24 rue Lhomond 75231 Paris Cedex 05, France and Paris-Meudon Observatory

Abstract

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The correlations between the UV galactic background (after subtraction of direct starlight), the neutral hydrogen HI, the extinction and the 100 μm emission are discussed for high galactic latitudes mainly based on a new analysis of the D2B satellite data. While clear correlations exist between UV and the other quantities, indicating that most of the UV galactic background is starlight scattered by interstellar dust, these correlations are less tight than the correlation between HI and the 100 μm emission. Localized UV excesses are shown to exist and are due in some cases to 2-photon emission by ionized gas. The quantitative interpretation of the UV galactic background in terms of dust properties is discussed, and it is shown that both the galactic model and the clumpiness of interstellar radiation may affect the results considerably.

Type
III. Diffuse Galactic Radiation from Dust and Gas: Observations and Models
Information
Symposium - International Astronomical Union , Volume 139: The Galactic and Extragalactic Background Radiation , 1990 , pp. 185 - 192
Copyright
Copyright © Kluwer 1990 

References

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