The Size and Morphology of Normal Galaxies at Z~3

Details The Size and Morphology of Normal Galaxies at Z~3 The Size and Morphology of Normal Galaxies at Z~3

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5302m&link_type=abstract

HST Proposal ID #5302

Computer Science

Hst Proposal Id #5302 Galaxies &Amp, Clusters Distant Galaxies

Scientific paper

Using the ESO 3.6m and the ESO-NTT, in Dec. 1991 we discovered three candidate sources of Ly-alpha emission associated with a damped Ly-alpha absorber at z(abs)=2.81, along the line of sight to the quasar Q0528-250. The first two candidates have been confirmed by spectroscopy. This is the first detection, confirmed by both imaging and spectroscopy, of a damped Ly-alpha galaxy. The absorber lies near the quasar z(em)=2.77, and possibly the far side of the cloud is photoionised by it. In this case we should see the circumference of the absorber as a ring of Ly-alpha emission. Indeed the nearest of the three sources may be a section where the ring is bright. However ground-based observations cannot distinguish between several possible explanations for the three sources. For example they could be regions of star formation in a single large (100 kpc) spiral disk, or three galaxies in a compact group. or merging subunits of a proto-galaxy. High-resolution HST Ly-alpha and continuum images of this system would greatly clarify these issues, for we would be able to resolve the three sources, and possibly detect the sought-for ring. Such detailed information on a young galaxy, proto-galaxy, or cluster, would go a long way to answering some fundamental questions on the origin of galaxies: What do galaxies at high redshift z~3 look like? How large were they, and were they still being assembled then?

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