Morphologies and faint neighbors of z=4.5 Lyman Alpha Emitting Galaxies

Details Morphologies and faint neighbors of z=4.5 Lyman Alpha Emitting Galaxies Morphologies and faint neighbors of z=4.5 Lyman Alpha Emitting Galaxies

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9411m&link_type=abstract

HST Proposal ID #9411

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Hst Proposal Id #9411

Scientific paper

We propose to image one ACS field containing four spectroscopically confirmed Ly-alpha emitters at z=4.5 in restframe UV and a narrowband filter containing the Ly-alpha line. These observations will {A} Reveal the morphology of the four spectroscopically confirmed sources. The high equivalent widths of the Ly-alpha line in these four galaxies in particular and this population in general cannot be explained without invoking one or more of: extreme youth of the stellar population, zero metallicity, energetic winds or type II quasars. Comparison of morphologies in the line and continuum would help favor or rule out some of these possibilties. This would also tell us whether the star-formation is uniformly distributed or centrally concentrated or concentrated but in many clumps? Proximity of these galaxies {average projected physical separation of 200 kpc, with one pair 30 kpc apart} also makes interactions likely. {B} Extend the luminosity function of Ly-alpha sources by 2.5 magnitudes due to better spatial resolution of HST and sensitivity of ACS. We will be able to detect sources with line flux of eq 2 * 10^-18 ergcm2s over 11.5 sq-arcmins { 100 sources}. This complements the LALA {Large Area Lyman Alpha} survey which covers 1/3 square-degree to a line sensitivity of eq 2 * 10^- 17. Thus we get a picture of this patch of young universe in two ways: statistics of faint galaxies and morphologies of relatively bright ones.

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