Computer Science
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6349t&link_type=abstract
HST Proposal ID #6349
Computer Science
Hst Proposal Id #6349 Qso Absorption Lines
Scientific paper
We will take Snapshot FOC images of 100 high z QSOs through UV filters to find a few QSOs whihc are relatively unabsorbed in the far UV. We have already proven that the method works well, and we now wish to complete the search of bright z>3 QSOs, and especially to extend to lower z QSOs. The 10 QSOs which will be detected have three uses: {1} QSOs at z>2.8 show He II 304 absorption at HST wavelengths. We now know of 5 QSOs which have flux at these wavelengths, and more are needed to {a} improve the determination of the rate of change of tau with z. {b} check for spatial variations in HeII absorption, {c} to measure the He II "proximity effect" which uses the balance between QSO and IGM background flux to measure the spectrum and intensity of the latter, and {d} to find one or two QSOs which are brighter than those now know, bright enough for high signal to noise spectra which separate the He II line absorption from the diffuse IGM. {2} Far UV spectra contain 90% of all QSO absorption lines, including all observable lines from many important elements and ions. High SNR spectra will give ionizations and metal abundances which can not be obtained with optical spectra alone. {3} We will combine both the detected fluxes and the upper limits to improve our measurement of the instrisic spectral slope of QSOs from the optical to eq 304 Angstrom.
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