Other
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.3514t&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #35.14; Bulletin of the American Astronomical Society, Vol. 24, p.1174
Other
Scientific paper
We present spectra of rest-frame optical lines in several high luminosity QSOs with z > 2, taken at KPNO with the Cryogenic Spectrometer on the 2.1m telescope. Using the spectra of the Hβ region, we have fit the amplitudes of Hβ , [O III], and Fe II (the latter using the I Zw 1 iron template created by Boroson and Green 1992). We have firm measurements of optical Fe II in three of the four objects, two of which should be considered strong optical Fe II emitters. We found significant [O III] flux in only one (1413+117, a lensed QSO; Kayser et al. 1990). Our measurements show several interesting results. First, the low measured [O III] fluxes are consistent with a high luminosity extrapolation of the low luminosity anticorrelation between L and [O III]. The strong [O III] measured for 1413+117 is consistent with an intermediate intrinsic luminosity and an amplification factor of 10 or more. The other two high redshift [O III] measurements in the literature (Kuhr et al. 1984; Carswell et al. 1991) are not consistent with this relation, having larger [O III] than expected. The [O III] and Fe II equivalent widths are consistent with the Boroson and Green (1992) low redshift sample, with the possible exception of 1413+117, which seems to have excess of [O III] or Fe II, lying in a region not populated by low redshift objects.
Elston Richard
Hill Gary J.
Thompson Keith L.
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