Computer Science – Performance
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990hst..prop.3057m&link_type=abstract
HST Proposal ID #3057
Computer Science
Performance
Hst Proposal Id #3057 Quasars &Amp, Agn
Scientific paper
Had the OTA PSF been as anticipated, then use of the the ultraviolet objective prisms of the Faint Object Camera would certainly have been the fastest and easiest means of obtaining exploratory low resolution spectra of objects. Whether or not this still is the case can only be checked by observation. One of several key FOC GTO programs employing the prisms involves carrying out an FUV spectroscopic "mini-survey" of a number of Z>3.1 quasars with the aim of identifying one or more objects that are not completely absorbed by intervening HI Lyman continuum absorption at emitted HeII 304 A - thereby permitting the detection of the anticipated "HeII forest" matching that seen in HI Lyman alpha, and the HeII equivalent of the Gunn-Peterson test for intergalactic helium to be carried out. It is proposed that a series of FOC FUV prism exposures of one of the qso's from the FOC GTO program be brought forward in order to evaluate the performance of the FOC prisms in with the present OTA PSF. A suitable target is 2204-409. This quasar is relatively bright (V=17.8) and is known to contain no strong HI Lyman limit or damped Lyman alpha absorption systems down to the atmospheric cutoff.
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