Computer Science
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8561m&link_type=abstract
HST Proposal ID #8561
Computer Science
Hst Proposal Id #8561 Cosmology
Scientific paper
Meaningful upper limits on the amount of ionizing radiation from galaxies in the current epoch have been obtained {by HUT} for only 3 galaxies. The contribution of normal galaxies to the cosmic UV background flux is even more uncertain at earlier times. We propose to determine the emission of normal, intermediate-redshift, star-forming galaxies in the FUV. If their average escaping ionizing flux is even 1/10 of their strong mid-UV flux, they are a comparable or even larger source of the background than AGN. Even a small contribution from the numerous normal galaxies has far-reaching implications for the strength, spectrum, and spatial homogeneity of the diffuse ionizing flux. This ionization controls the properties of the young IGM, from the Ly-alpha forest to protogalaxies. The STIS/FUV-MAMA imager can provide an extremely sensitive measurement of the pure Lyman- limit continuum from the brightest galaxies at 1.1 <= z <= 1.7. Our integrations will be deep enough to provide detections or highly significant {50Sigma} upper limits, for more than three times as many galaxies as have been previously published {and those were only at low redshift}. If the average ratio of Lyman limit/mid-UV fluxes is even as small as a few percent, these proposed observations will underlinedetect it.
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