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Mem. S.A.It. Vol. 75, 282 c SAIt 2011 Memorie della

Summary: Mem. S.A.It. Vol. 75, 282
c SAIt 2011 Memorie della
Progress in Understanding
the Diffuse UV Cosmic Background
Richard Conn Henry
Henry A. Rowland Department of Physics & Astronomy, The Johns Hopkins University,
Baltimore, Maryland, 21218-2686 USA
e-mail: henry@jhu.edu
Abstract. I report on progress in my ongoing work with Professor Jayant Murthy con-
cerning the origin and nature of the diffuse ultraviolet background radiation over the sky.
We have obtained and are reducing a vast trove of Voyager ultraviolet spectrometer obser-
vations of the diffuse background shortward of L, including for the first time measure-
ments made from the outermost regions of the solar system, where noise from solar-system
scattered (and then grating-scattered) solar L is lowest. Also, we have obtained and are
investigating the complete set of GALEX observations of the diffuse ultraviolet background
longward of L. Preliminary investigation appears to confirm that longward of L there
exists a component of the diffuse ultraviolet background that is not dust-scattered starlight.
Key words. techniques: ultraviolet -- cosmology: diffuse background
1. Introduction
I have previously reported, at these Frascati


Source: Henry, Richard C.- Department of Physics and Astronomy, Johns Hopkins University


Collections: Physics