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- W3098558971 endingPage "102" @default.
- W3098558971 startingPage "39" @default.
- W3098558971 abstract "Using high-resolution UV spectra of 16 low-z QSOs, we study the physical conditions and statistics of O VI absorption in the IGM at z 30 mA, the number of O VI absorbers per unit redshift dN/dz = 15.6(+2.9/-2.4) [21.0(+3.2/-2.8)], and this decreases to dN/dz = 0.9(+1.0/-0.5) [0.3(+0.7/-0.3)] for W_{r} > 300 mA. The number per redshift increases steeply as z_{abs} approaches z_{QSO}, and some proximate absorbers have substantially lower H I/O VI ratios. The lower proximate ratios could be partially due to ionization effects but also require higher metallicities. We find that 37% of the intervening O VI absorbers have velocity centroids that are well-aligned with corresponding H I absorption. If the O VI and the H I trace the same gas, the relatively small differences in line widths imply the absorbers are cool with T 10^{5} K and cold photoionzed gas." @default.
- W3098558971 created "2020-11-23" @default.
- W3098558971 creator A5004537754 @default.
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- W3098558971 date "2008-07-01" @default.
- W3098558971 modified "2023-09-26" @default.
- W3098558971 title "A High‐Resolution Survey of Low‐Redshift QSO Absorption Lines: Statistics and Physical Conditions of O<scp>vi</scp>Absorbers" @default.
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