Theoretical Modeling of the Metagalactic Ionizing Radiation Background and IGM Metallicities

Details Theoretical Modeling of the Metagalactic Ionizing Radiation Background and IGM Metallicities Theoretical Modeling of the Metagalactic Ionizing Radiation Background and IGM Metallicities

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9520s&link_type=abstract

HST Proposal ID #9520

Mathematics

Logic

Hst Proposal Id #9520 Quasar Absorption Lines

Scientific paper

We propose a theoretical exploration of the metagalactic ionizing background radiation, applied to understanding the baryon content, metallicity, and nucleosynthetic history of the intergalactic medium {IGM}. Photoionization by quasars and starburst galaxies appear to dominate the ionization of hydrogen, helium, and many heavy elements {C, Si, N, O} observed by Hubble and FUSE through quasar absorption-line systems. In order to make precision measurements of the total gas mass and metallicity, one must apply substantial ``ionization corrections" to the observed ion stages {e.g., H I, He II, Si III, Si IV, C III, C IV}. New high-quality data from STIS and COS will require us to develop ionization models at higher level of precision from the present {Haardt & Madau 1996; Fardal, Giroux, & Shull 1998}. These new models will include accurate atomic data, ionizing source spectra, IGM opacity, and cosmological radiative transfer calculations, with many underlying theoretical issues. We propose to develop a web-based tool designed to calculate the metagalactic ionizing background and ionization corrections at epochs from z 6 down to the present. Our models will be available to the astronomical community on a CU-maintained website, which could be linked to the STScI. These precision calculations are a critical tool for the key absorption-line science done with spectrographs aboard HST {STIS, COS} and FUSE.

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