Physics
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993hst..prop.4341j&link_type=abstract
HST Proposal ID #4341
Physics
Hst Proposal Id #4341
Scientific paper
We propose high resolution UV spectroscopy of the bright low redshift QSO KUV18217+64 to study selected absorption systems in the low redshift Lyman ALPHA forest. Observations with the G160M grating and GHRS will be used to resolve the strong Lyman ALPHA and Lyman BETA absorption lines that have been detected in this QSO at z = 0.214 and z = 0.225. These observations will be used to determine the amount of structure within these absorption systems. If the lines do not have multiple components, then accurate values of the Doppler parameter will be determined and used to set upper limits to the temperature in these Ly ALPHA clouds. Ly ALPHA forest clouds are expected to evolve toward cooler temperatures at the present epoch so these observations could reveal some low temperature clouds. An understanding of the physics of Lyman ALPHA clouds is necessary in order to use observations of these clouds to probe physical conditions in the intergalactic medium over a wide range of redshift.
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