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• W3132051346 endingPage "996" @default.
• W3132051346 startingPage "985" @default.
• W3132051346 abstract "Evolution of the cosmic star formation rate (SFR) and molecular gas mass density is expected to be matched by a similarly strong evolution of the fraction of atomic hydrogen (HI) in the cold neutral medium (CNM). We use results from a recent commissioning survey for intervening 21-cm absorbers with the Australian Square Kilometre Array Pathfinder (ASKAP) to construct a Bayesian statistical model of the $N_{rm HI}$-weighted harmonic mean spin temperature ($T_{rm s}$) at redshifts between $z = 0.37$ and $1.0$. We find that $T_{rm s} leq 274$K with 95 per cent probability, suggesting that at these redshifts the typical HI gas in galaxies at equivalent DLA column densities may be colder than the Milky Way interstellar medium ($T_{rm s, MW} sim 300$K). This result is consistent with an evolving CNM fraction that mirrors the molecular gas towards the SFR peak at $z sim 2$. We expect that future surveys for HI 21-cm absorption with the current SKA pathfinder telescopes will provide constraints on the CNM fraction that are an order of magnitude greater than presented here." @default.
• W3132051346 created "2021-03-01" @default.
• W3132051346 creator A5002092890 @default.
• W3132051346 date "2021-02-24" @default.
• W3132051346 modified "2023-10-17" @default.
• W3132051346 title "A statistical measurement of the H <scp>i</scp> spin temperature in DLAs at cosmological distances" @default.
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