Astronomy and Astrophysics – Astrophysics
Scientific paper
1995-08-31
Astrophys.J. 460 (1996) 584; Erratum-ibid. 573 (2002) 471
Astronomy and Astrophysics
Astrophysics
28 pages, 5 figures, style file: aaspp4.sty included. Latex file, style file, and five figures are tarred, compressed and uuen
Scientific paper
10.1086/176994
We have conducted the first survey for Oxygen VI $\lambda\lambda 1032,1038$ absorption lines in QSO spectra. We used medium resolution ($R \approx 1300$) high signal-to-noise ($\approx 20$) Faint Object Spectrograph spectra of 11 QSOs ($0.53\leq$\zem$\leq2.08$) from the Hubble Space Telescope Archive. We use simulated spectra to determine the significance of the line identifications, which lie exclusively in the \Lya forest. We found 12 O~VI doublets of which 9 are expected to be real and 6 constitute a uniform sample with both lines exceeding a rest equivalent width of $W_r =0.21$ \AA. The number of O~VI doublets per unit redshift at a mean absorption redshift of $z_{ave} = 0.9$ is $\langle N(z)\rangle = 1.0 \pm0.6$, which is similar to the density of C~IV and Mg~II absorbers.
Burles Scott
Tytler David
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