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• W2593125901 abstract "We have searched for H i 21-cm absorption in 11 strong Mg ii systems (Wr(Mg ii λ2796) ≥ 1 Å) at 0.3 < z < 0.5 using the Giant Metrewave Radio Telescope. We have detected H i 21-cm absorption in two of these systems. From the integrated optical depth (∫τdv), we estimate N(⁠|${H,small {I}}$|⁠) = 43 ± 2 and 9 ± 2 in units of 1019 cm−2 for the absorbers towards J1428+2103 (zabs = 0.3940) and J1551+0713 (zabs = 0.3289), respectively, assuming spin temperature Ts = 100 K and gas covering factor Cf = 1. The velocity width of the H i absorption towards J1428+2103 and J1551+0713 indicates that the gas temperature is <1600 and <350 K, respectively. The 3σ upper limits on ∫τdv in the case of the H i 21-cm non-detections indicate that these Mg ii absorbers are likely to arise from sub-damped Lyman α systems, when we assume Ts = 100 K and Cf = 1. This is verified for one of the systems which has N(⁠|${H,small {I}}$|⁠) measurement using Lyman α absorption detected in the ultraviolet spectrum. We estimate the detection rate of H i 21-cm absorption in strong Mg ii systems in our sample to be 0.18|$^{+0.24}_{-0.12}$| at z ∼ 0.35, for an integrated optical depth sensitivity of ≤0.3 km s−1. Comparing with the results of H i 21-cm absorption surveys in strong Mg ii systems at higher redshifts from the literature, we do not find any significant evolution in the incidence and number density per unit redshift of H i 21-cm absorbers in strong Mg ii systems over 0.3 < z < 1.5." @default.
• W2593125901 created "2017-03-16" @default.
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• W2593125901 date "2017-03-03" @default.
• W2593125901 modified "2023-09-23" @default.
• W2593125901 title "H i 21-cm absorption from z ∼ 0.35 strong Mg ii absorbers" @default.
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• W2593125901 doi "https://doi.org/10.1093/mnras/stx538" @default.
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