Lyman-Alpha Imaging of Young and Forming Galaxies at Large Redshifts

Details Lyman-Alpha Imaging of Young and Forming Galaxies at Large Redshifts Lyman-Alpha Imaging of Young and Forming Galaxies at Large Redshifts

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991hst..prop.2698d&link_type=abstract

HST Proposal ID #2698

Computer Science

Hst Proposal Id #2698

Scientific paper

A number of the recently discovered optical counterparts of powerful radio sources such as 3C 326.1 at z ~= 1.8 have properties which can be interpreted as those of giant galaxies or cluster cores in the process of formation. Among these are the galaxies' large size, clumpy appearance, strong Ly alpha emission, low continuum surface brightness, large velocity fields, and estimated star formation rates of several hundred Mo/yr. While the presence of strong radio lobes marks these objects as atypical, they are the best candidates for primeval galaxies now known. UV imaging with the HST can check this hypothesis, and provide further insights into their nature. We propose to do imaging in intermediate width bands containing the Ly alpha line of 3C 326.1, our primary primeval galaxy candidate, and 3C 256, a radio galaxy with comparable redshift which shows a strong Ly alpha, bright and compact stellar continuum, and is an excellent example of the radio-optical alignment effects. The initial burst of star formation in 3C 256 may be over, but it is still very young and actively evolving. Ly alpha imaging will reveal the distribution of star formation in these galaxies, and constrain estimates of star formation rate, jet-galaxy interaction, and and gas ionization mechanisms.

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