Imaging of a Protogalaxy at z=2.7 Discovered by its Young Stellar Population

Details Imaging of a Protogalaxy at z=2.7 Discovered by its Young Stellar Population Imaging of a Protogalaxy at z=2.7 Discovered by its Young Stellar Population

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6832y&link_type=abstract

HST Proposal ID #6832

Physics

Hst Proposal Id #6832 Cosmology

Scientific paper

A protogalaxy candidate at z=2.7 has been discovered serendipitously by the CNOC cluster redshift survey. The candidate is a very bright {V=20.5 mag, absolute mag -28}, resolved {2''*4''}, disk-like galaxy with a strong absorption line spectrum indicative of young O, B, and A stars. The most likely interpretation of this object is that it is an early- type galaxy observed within 0.5 Gyr since its initial burst of star formation which produced most of its stellar mass. We propose to obtain HST images in 3 filters {F814W, F555W, and F300W} to study its structure and morphology in detail. These data will enable us to confirm our interpretation that the continuum arises from young stars, and to investigate the dynamical and evolutionary state of the protogalaxy and the uniformity of the star forming prcoess. The high resolution images will allow us to set stringent limits on the size of the bulge, the existence of a hidden quasar and gravitational lensing, if any. The nature, spatial distribution, and age of the stars can be studied using spatially resolved colors from these images. We estimate that the F555W-F814W color will allow us to discriminate age since star formation to an accuracy of 0.1 Gyr. The F300W filter images the galaxy below the Ly limit, providing important proof of the stellar origin of the continuum and additional constraints on the existence of on-going star formation. Furthermore, these observations will also allow us to study the possible existence of a group or cluster associated with this object.

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