High-Redshift Galaxies and Their Contribution to the Ionizing Background

Details High-Redshift Galaxies and Their Contribution to the Ionizing Background High-Redshift Galaxies and Their Contribution to the Ionizing Background

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6570g&link_type=abstract

HST Proposal ID #6570

Physics

Hst Proposal Id #6570 Interstellar Medium

Scientific paper

We propose objective-prism spectroscopy with the FOC-F/96 + FUVOP of a well-controlled sample of 10 blue galaxies at redshifts 1, to study their UV spectral energy distribution, from shortward of the Lyman limit to longward of Ly-alpha. Aim of the project is to investigate on 1} the contribution by star-forming galaxies at half the Hubble time to the ionizing background; 2} the star-formation activity in these galaxies. This data bears on several key issues, including galaxy formation and evolution, the physical state of gas in protogalaxies and the degree of ionization of the QSO absorption systems. The sample is selected from the statistically-complete Canada-France Redshift Survey for having I_AB<22 and {U-I}_AB<1.4, corresponding to the color of a present-day Sbc galaxy, and includes galaxies in the range 0.8< z< 1.1. Among these there are the blue galaxies with peculiar morphology and enhanced star-formation activity which dominate the faint counts. Several reasons suggest that these galaxies could be important contributors of UV ionizing radiation. From the FOC UV data we will measure, or set tight limits on, the flux of ionizing photons, and, by combining the UV spectra of the galaxies with existing optical spectroscopy, photometry and WFPC2 morphology, will obtain quantitative information on the initial mass-function, star-formation rate and structure of the ISM, which is essential to reconstruct the evolutionary history of the faint blue galaxies to the present epoch.

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