An upper limit on the cosmic ultraviolet background

Details An upper limit on the cosmic ultraviolet background An upper limit on the cosmic ultraviolet background

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...391...34w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 391, no. 1, May 20, 1992, p. 34-38.

Astronomy and Astrophysics

Astrophysics

21

Milky Way Galaxy, Relic Radiation, Ultraviolet Radiation, Astronomical Maps, Galactic Structure, Gravitational Effects

Scientific paper

The 1989 diffuse UV background data of Fix et al. (1989), when modeled as an optically thin, geometrically thin Galactic disk, implies an extragalactic UV background of 4 +/- 80 units at 0.15 micron, rather than the 530 +/- 80 units given by Fix et al. A more conservative fit allowing for forward scattering by dust and a finite optical depth to the Galactic pole gives a best-fit value of 45 units for the extragalactic flux, with a conservative limit of less than 500 units, similar to the lowest observed flux. Comparing the gradient of the UV flux versus csc absolute value of b with the IRAS 100 micron gradient implies an unexpectedly low scattering cross section for dust at 0.15 micron, compared to the absorption cross section in the visible.

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