UV background radiation, dust and gas at high galactic latitude

Details UV background radiation, dust and gas at high galactic latitude UV background radiation, dust and gas at high galactic latitude

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...128..114j&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 128, no. 1, Nov. 1983, p. 114-123.

Astronomy and Astrophysics

Astronomy

32

Background Radiation, Cosmic Dust, Far Ultraviolet Radiation, Interstellar Gas, Ultraviolet Astronomy, Correlation, Diffuse Radiation, Hydrogen Clouds, Sky Brightness, Sky Surveys (Astronomy), Spaceborne Astronomy

Scientific paper

The high-galactic latitude (/b/ greater than 30 deg) whole sky survey obtained with the D2B-Aura satellite at 1690 and 2200 A is discussed. The existence of a correlation of the UV sky brightness with the H I column density and with the interstellar extinction as derived from galaxy counts is confirmed. The stellar UV light scattered by high latitude dust associated with H I is likely to be responsible for the major part of this space variability. The asymmetry factor of the scattering phase function g is found in the range 0.6-0.7, at variance with the results of some studies of reflection nebulae. Taking into account a possible contribution from residual direct stellar light at 2200 A, and from a spurious flux of instrumental origin at 1690 A, the best estimates for the true extragalactic background are in the range of 300-690 units at 1690 A and 160-360 units at 2200 A. Excesses of UV radiation at both wavelengths are finally observed which, as a whole, correspond to the inner regions of large H I shells. Possible mechanisms to explain these excesses are discussed.

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