Detailed Morphology of a Lyman-Alpha Galaxy at Z=2.3

Mathematics – Logic

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Hst Proposal Id #6564 Cosmology

Scientific paper

The identification and detailed study of galaxies at high redshift remains the most direct path to understanding galaxy formation and evolution, yet there are only a handful of radio quiet galaxies known in emission at z>1.5. By using HST and WFPC2 to image the Coup Fourre Galaxy -- the first Lyman-alpha emission galaxy discovered near a high-redshift damped Ly- alpha absorption line cloud-- at z=2.3 in Ly-alpha and broad-band V and I, I will discriminate between star formation and nuclear activity as the source of Ly-alpha emission and will be able to test for evidence of galaxy mergers or interaction, and of the clumpy star formation sites thought to accompany young, coalescing galaxies. This source is a viable candidate for a primeval galaxy, the Rosetta Stone of cosmology, and detailed morphological study on kpc scales is crucial to compare the light profile to current-day disk or bulge systems, to relate the galaxy's characteristics directly to theories of galaxy formation, and to help clarify the relation between absorbing and emitting galaxies. Multi-band photometry will allow direct comparison to spectral synthesis models of galaxy evolution to estimate the galaxy's age and star formation history. We will also search the field for additional compact galaxies or protogalaxies physically associated with the absorber/emitter pair, using the Ly-alpha and broad-band filters to select candidates via their colors, sizes, and morphologies.

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