Closing in on the Hydrogen Reionization Edge of the Universe at z<7.2 with deep STIS/CCD Parallels

Details Closing in on the Hydrogen Reionization Edge of the Universe at z<7.2 with deep STIS/CCD Parallels Closing in on the Hydrogen Reionization Edge of the Universe at z<7.2 with deep STIS/CCD Parallels

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9066w&link_type=abstract

HST Proposal ID #9066

Physics

Hst Proposal Id #9066 Cosmology

Scientific paper

We propose 398 parallel orbits to constrain the Hydrogen reionization edge in emission that marks the transition from a neutral to a fully ionized IGM at a predicted redshifts zion eq5-10. The edge is due to a rapid change in recombination from the Hydrogen Lyman series at z eqzion Baltz Etal 1998}, which leaves a sharp signal in the recombination spectrum cge 3 dex below the Zodiacal background. zion is one of the most important remaining unknown quantities in cosmology. HST is unique in that it can constrain this signal with the STIS CCD plus long-slit, covering Lambda eq5240-10, 270Angstrom or z eq3.3-7.5. In Cycle 8, we took 28 STIS parallel orbits with contemporaneous calibrations to reduce systematics, and set limits to the Hydrogen edge signal of 2* 10^-21 erg/cm^2/s/Hz/sr at zioncge 5. This 28 orbit data set has not yet pushed STIS to its absolute calibration limits. We therefore propose parallels in 260 high and sim100 lower latitude fields {1-3 orbits each} to map any variation in the Zodiacal spectrum across the sky. The combined data will allow us to improve constraints to the Hydrogen reionization edge at 5 zion 7.5 by a factor of 4, within reach of theoretical predictions. We must develop this technique to learn 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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