FOS Observations of the QSO 1442+101 (OQ 172)

Details FOS Observations of the QSO 1442+101 (OQ 172) FOS Observations of the QSO 1442+101 (OQ 172)

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.1115l&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #11.15; Bulletin of the American Astronomical Society, Vol. 24, p.1136

Astronomy and Astrophysics

Astronomy

2

Scientific paper

Low resolution far-UV spectra of the high redshift (zem=3.54) QSO OQ172 have been obtained with the prism and the G160L grating of the Faint Object Spectrograph on board the Hubble Space Telescope. Light is detected down to a rest wavelength near 323 Angstroms where the spectrum appears to be cut off, possibly by a Lyman limit system. This cutoff is only 18000 km sec(-1) in velocity units longward of the predicted He II lambda 304 feature (the He II lambda 304 Gunn-Peterson effect and the He II lambda 304 forest). A partial Lyman limit is observed near 2800 Angstroms. The UV spectra have been combined with Lick CCD optical spectra to determine the shape of the continuum short of Lyalpha and the applicability to it of the ``Lyman valley'' model presented by M\o ller and Jakobsen (A&A 228, 299, 1990).

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