A survey of extremely metal-poor gas at cosmic noon - Evidence of elevated [O/Fe]

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Volume 691 (November 2024)

A&A, 691 (2024) A285

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Table 2.

Ion column densities of the DLA at z_abs = 3.696621 ± 0.000002 toward the quasar J0140−0839.

				log₁₀N(X)/cm⁻²
Comp.	z_abs	b_turb [km s⁻¹]	C II	O I	Al II	Si II	Fe II
1	3.696253 ± 0.000005	0.001 (fixed) ^(a)	–	13.16 ± 0.04	–	11.68 ± 0.07	–
2	3.69642 ± 0.00002	10.7 ± 1.0	13.35 ± 0.05	13.48 ± 0.07	11.23 ± 0.06	12.50 ± 0.05	–
3	3.696621 ± 0.000002	5.45 ± 0.23	13.62 ± 0.03	14.31 ± 0.01	11.33 ± 0.04	12.90 ± 0.02	12.64 ± 0.05
4	3.697022 ± 0.00002	15.7 ± 2.4	13.32 ± 0.07	13.97 ± 0.06	11.21 ± 0.09	12.64 ± 0.06	–
5	3.697283 ± 0.000001	5.65 ± 0.29	13.58 ± 0.03	14.25 ± 0.03	11.42 ± 0.04	12.88 ± 0.03	12.56 ± 0.06
6	3.697629 ± 0.000003	4.30 ± 0.41	12.84 ± 0.04	13.17 ± 0.03	10.83 ± 0.08	12.17 ± 0.02	–
7	3.69797 ± 0.00002	15.1 ± 2.2	12.92 ± 0.05	–	–	–	–

Notes. The quoted column density errors are the 1σ confidence limits. The total column density of hydrogen can be found in Table 8.

^(a)

This represents the line broadening due to the turbulence of this component only. The total Doppler broadening is a combination of the thermal and turbulent broadening ( $b_{tot}^{2} = b_{th}^{2} + b_{turb}^{2}$ $b_{\mathrm{tot}}^{2} = b_{\mathrm{th}}^{2} + b_{\mathrm{turb}}^{2}$ ). In this case T = 1.0 × 10⁴ K.

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