ACS Pure Parallel Lyman-Alpha Emission Survey {APPLES}

Details ACS Pure Parallel Lyman-Alpha Emission Survey {APPLES} ACS Pure Parallel Lyman-Alpha Emission Survey {APPLES}

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9482r&link_type=abstract

HST Proposal ID #9482

Biology

Quantitative Biology

Populations and Evolution

Hst Proposal Id #9482

Scientific paper

Ly-alpha line emission is an efficient tool for identifying young galaxies at high redshift, because it is strong in galaxies with young stars and little or no dust -- properties expected in galaxies undergoing their first burst of star- formation. Slitless spectroscopy with the ACS Wide-Field Camera and G800L grism allows an unmatched search efficiency for such objects over the uninterrupted range 4 < z < 7. We propose the ACS Pure Parallel Ly-alpha Emission Survey {``APPLES''}, to exploit this unique HST capability and so obtain the largest and most uniform sample of high redshift Ly-alpha emitters yet. Parallel observations will allow this survey to be conducted with minimal impact on HST resources, and we will place reduced images and extracted spectra in the public domain within three months of observation. We aim to find 1000 Ly-alpha emitters, 5 times the biggest current sample of Ly-alpha emitters. This unprecedented sample will provide robust statistics on the populations and evolution of Ly-alpha emitters between redshifts 4-7; a robust measurement of the reionization redshift completely independent of the Gunn-Peterson trough; spatial clustering information for Ly-alpha emitters which would let us probe their bias function and hence halo mass as a function of redshift; many galaxies at redshift exceeding 6; and lower redshift serendipitous discoveries.

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