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• W2892210216 endingPage "4959" @default.
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• W2892210216 abstract "We present further results of a survey for absorption line systems in the spectra of four high redshift quasars (5.79 ≤ zem ≤ 6.13) obtained with the ESO Very Large Telescope X-Shooter. We identify 36 C iv and 7 Si iv systems with a ≥ 5σ significance. The highest redshift C iv and Si iv absorbers identified in this work are at z = 5.80738 ± 0.00017 and z = 5.77495 ± 0.00038, respectively. We compute the comoving mass density of Si iv (⁠|$Omega _{mathrm{ Si}, {rm {small IV}}}$|⁠) and find that it evolves from |$Omega _{mathrm{ Si}, {rm {small IV}}}$| = 4.3|$^{+2.1}_{-2.1} times 10^{-9}$| at |$langle zrangle$| = 5.05 to |$Omega _{mathrm{ Si}, {rm {small IV}}}$| = 1.4|$^{+0.6}_{-0.4} times 10^{-9}$| at |$langle zrangle$| = 5.66. We also measure |$Omega _{mathrm{ C}, {rm {small IV}}}$| = 1.6|$^{+0.4}_{-0.1} times 10^{-8}$| at |$langle zrangle$| = 4.77 and |$Omega _{mathrm{ C}, {rm {small IV}}}$| = 3.4|$^{+1.6}_{-1.1} times 10^{-9}$| at |$langle zrangle$| = 5.66. We classify our C iv absorber population by the presence of associated low- and/or high-ionization systems and compute their velocity width (Δv90). We find that all C iv systems with Δv90 > 200 km s−1 have associated low-ionization systems. We investigate two such systems separated by 550 physical kpc along a line of sight, and find it likely that they are both tracing a multiphase medium where hot and cold gas is mixing at the interface between the circumgalactic medium and intergalactic medium. We further discuss the Mg ii systems presented in a previous work and we identify 5 Si ii, 10 Al ii, 12 Fe ii, 1 C ii, 7 Mg i, and 1 Ca ii associated transitions. We compute the respective comoving mass densities in the redshift range 2–6, as allowed by the wavelength coverage." @default.
• W2892210216 created "2018-09-27" @default.
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• W2892210216 date "2018-09-21" @default.
• W2892210216 modified "2023-10-15" @default.
• W2892210216 title "The CGM and IGM at z ∼ 5: metal budget and physical connection" @default.
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• W2892210216 doi "https://doi.org/10.1093/mnras/sty2576" @default.
• W2892210216 hasPublicationYear "2018" @default.
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