Searching for the Hydrogen Reionization Edge of the Universe at 5<z<7.5 with deep STIS/CCD Parallels

Details Searching for the Hydrogen Reionization Edge of the Universe at 5<z<7.5 with deep STIS/CCD Parallels Searching for the Hydrogen Reionization Edge of the Universe at 5<z<7.5 with deep STIS/CCD Parallels

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8260w&link_type=abstract

HST Proposal ID #8260

Physics

Hst Proposal Id #8260 Clusters Of Galaxies And Lensing

Scientific paper

We propose 36 parallel orbits {4-5 fields of 5-8 orbits each} to constrain the H Lyman-edge in emission that marks the transition from a neutral to a fully ionized IGM at a predicted zion eq5-15. This edge is due to recombination from the H Lyman series and Lyman continuum, and can be used to constrain zion, one of the most important unknown quantities in large scale structure and cosmology. Baltz Etal {1998} have shown that there is a rapid change in absorption around zion, which can leave a sharp edge signal in the spectrum of recombining Hydrogen with amplitude JnuLy eqfew* 10^-23 erg/cm^2/s/Hz/sr on top of an extragalactic background of JnuEBL eq5*10^-21, 3-4 dex below the zodiacal background. The model amplitude uncertainty is cge 0.5 dex. HST can constrain this signal in the sky background for Lambda 1Mu, but only with the STIS CCD, its 52*2'' long slit and G750L grating -- covering Lambda eq 6000-10, 300Angstrom and z eq4-7.5. We expect to set upper limits to various models for J u Ly, and possibly make a detection of JnuEBL, either of which will constrain zion. This is a difficult project that must use contemporaneous STIS calibrations at the bright side of each parallel orbit to reduce systematic errors to an absolute minimum. We must develop this technique properly to find out how to optimally develop instruments for NGST, to make this measurement with greater sensitivity and at higher redshifts {z eq7.5-15}.

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