Computer Science
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7462i&link_type=abstract
HST Proposal ID #7462
Computer Science
Hst Proposal Id #7462 Galaxies
Scientific paper
We propose to use the Space Telescope Imaging Spectrograph to observe a recently-discovered optical Einstein ring. The presence of a strong Ly_Alpha emission line in the spectrum of the ring allows one to map the position of the emission line peak around the ring, thereby measuring velocity differences in the extended source object, a star-forming galaxy at z=3.6. Our recent ground-based observations of this system {Lewis & Ibata 1996}, which spatially resolved five elements around the ring, suggest that this distant galaxy is rotating at 200 km/s {half-amplitude}. The consequences of this result to models of galaxy formation is considerable, suggesting that the disk component of the source galaxy has formed by that redshift. However, the lack of spatial resolution in the ground-based data precludes the derivation of a rotation curve of the source galaxy. Here we propose to use the unique spatial resolution of STIS to obtain 40 spatially-resolved spectra around the circumference of the Einstein ring. This will allow us to verify the result based upon the crudely- resolved ground-based data. Coupled with an accurate lensing model to be determined from WFPC2 observations {time has been allocated in cycle 6}, the STIS data will yield a rotation curve in one of the most distant known galaxies, allowing the confrontation of models of galaxy formation to data from the earliest epochs.
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