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2010ApJ...708..868C -
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Astrophys. J., 708, 868-908 (2010/January-1)
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The last eight-billion years of intergalactic C IV evolution.
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COOKSEY K.L., THOM C., PROCHASKA J.X. and CHEN H.-W.
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Abstract (from CDS):
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We surveyed the Hubble Space Telescope UV spectra of 49 low-redshift quasars for z < 1 C IV candidates, relying solely on the characteristic wavelength separation of the doublet. After consideration of the defining traits of C IV doublets (e.g., consistent line profiles, other associated transitions, etc.), we defined a sample of 38 definite (group G = 1) and five likely (G = 2) doublets with rest equivalent widths W_{r} for both lines detected at. We conducted Monte Carlo completeness tests to measure the unblocked redshift (Δz) and co-moving path length (ΔX) over which we were sensitive to C IV doublets of a range of equivalent widths and column densities. The absorber line density of (G = 1+2) doublets is for log N(C^{+3}) ≥ 13.2, and has not evolved significantly since z = 5. The best-fit power law to the G = 1 frequency distribution of column densities has coefficient k = 0.67^{+0.18}_{–0.16}x10^{–14} cm2 and exponent α_{N}= -1.50^{+0.17} _{–0.19}, where N_{0}= 10^{14} cm2. Using the power-law model of f(N(C^{+3})), we measured the C^{+3} mass density relative to the critical density: for 13 ≤ log N(C^{+3}) ≤ 15. This value is a 2.8±0.7 increase in compared to the error-weighted mean from several 1 < z < 5 surveys for C IV absorbers. A simple linear regression to over the age of the universe indicates that has slowly but steadily increased from z = 5 -> 0, with.

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Abstract Copyright:
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∼

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Journal keyword(s):
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intergalactic medium - quasars: absorption lines - techniques: spectroscopic
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VizieR on-line data:
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<Available at CDS (J/ApJ/708/868): targets.dat table1.dat table2.dat>

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CDS comments:
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In tables, HE0226-4410 is a misprint for HE 0226-4110.

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Simbad objects:
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70

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2021.03.01-14:39:36

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