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2012MNRAS.421..446M - Mon. Not. R. Astron. Soc., 421, 446-467 (2012/March-3)
A high-resolution study of intergalactic O VI absorbers at z ∼ 2.3.
MUZAHID S., SRIANAND R., BERGERON J. and PETITJEAN P.
Abstract (from CDS):
We do not find any evidence for the ratios N(O VI)/N(H I), N(O VI)/N(C IV) and N(C IV)/N(H I) to evolve with z over the redshift range considered here. However, a lack of systems with high N(O VI)/N(H I) ratio (i.e. ≥ -0.5 dex) for z > 2.5 is noticeable. Similar trend is also seen for the N(C IV)/N(H I) ratio. We compare the properties of O VI systems in our sample with that of low-redshift (z < 0.5) samples from the literature and find that (i) the O VI components at low z are systematically wider than at high z with an enhanced non-thermal contribution to their b parameter, (ii) the slope of the column density distribution functions for high and low z is consistent, (iii) the range in gas temperature estimated from a subsample of well-aligned absorbers is similar at both high and low z and (iv) ΩOvi = (1.0±0.2)x 10–7 for N(O VI) > 1013.7/cm2, estimated in our high-z sample, is very similar to low-z estimations.
Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS
Journal keyword(s): intergalactic medium - quasars: absorption lines - quasars: general
Simbad objects: 19
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