Physics
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7941i&link_type=abstract
HST Proposal ID #7941
Physics
Hst Proposal Id #7941
Scientific paper
We have discovered the highest redshift object known with a confirmed redshift from Keck spectra of z=4.92 {Franx et al, 1997, ApJ Letters 486, L75}. The galaxy is a red arc lensed by a foreground cluster. This provides a unique advantage, because the arc is highly magnified {by a factor of 5 to 11, depending on the exact position within the arc}. We have been able to reconstruct the original image very successfully from this highly magnified arc. This is one of the highest resolution images available on any high redshift galaxy The discovery was based on a large WFPC2 mosaic of the cluster CL1358+62. Here we propose to take NICMOS imaging to determine the morphology and size of the galaxy at 2700 A rest wavelength. This data is crucial for a good understanding of the stellar population, and to test the presence of an older, underlying population. We have already obtained IR imaging with the KECK telescope, which has shown that the galaxy is much redder than expected for a young burst of star formation. The consequence is that a significant amount of dust is present. Furthermore, the mass has increased to 1-2 10**9 solar masses. This dramatic increase in the mass follows immediately from the IR fluxes, and is not dependent on the assumptions concerning the dust. The NICMOS images will help to establish the morphology of the lensed galaxy in the IR, and will be necessary to detect possible color variations across the arc.
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