CfA Colloquium Schedule Spring 2006
 27 April 2006

27 April 2006

Speaker: Jerry Edelstein (Berkeley)

Title: The Galactic Far Ultraviolet Sky

Abstract: The first extensive spectral imaging observations of the cosmic far ultraviolet background (900-1750 Angstroms) have been obtained with the SPEAR micro-mission. The SPEAR Mission, its data, and the character of the FUV sky are described. Galactic diffuse FUV cosmic radiation is concentrated where both hot stars and scattering dust coexist, e.g. in the Galactic plane, young stellar associations, and the Magellanic clouds. Far UV emission lines from a variety of hot and warm ionized gas, including O VI, O IV, C IV, C III, C I, Si IV, Si II, and Al II, have been found in the general ISM, in young nearby SNR, evolved SNR and in superbubbles. Fluorescence emission from diffuse molecular hydrogen is seen to be ubiquitous about the Galaxy.

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