HI absorption in a gravitational lens at $z\sim 0.7645$

Abstract

We have used the Westerbork Synthesis Radio Telescope to detect HI 21cm absorption at $z\sim 0.7645$ in the gravitational lens system towards PMN J0134-0931. The 21cm profile has two broad components, with peak optical depths of $0.047\pm 0.007$ and $0.039\pm 0.007$, at heliocentric redshifts $0.76470\pm 0.00006$ and $0.76348\pm 0.00006$, respectively. The redshift of the stronger component matches that of CaII H and K absorption detected earlier. The absorption has a total velocity width of $\sim 500$ km/s (between nulls) and an equivalent width of $7.1\pm 0.08$ km/s. This would imply a total HI column density of $2.6\pm 0.3\times 10^{21}$ per cm${}^2$, for a spin temperature of 200 K and a covering factor of unity. The high estimated HI column density is consistent with the presence of large amounts of dust at the lens redshift; the intervening dust could be responsible for the extremely red colour of the background quasar.

4 pages, 4 figures. Accepted for publication in A&A Letters

References in corpus (5)

• A deep search for 21cm absorption in high redshift damped Lyman-$\alpha$ systems
• Detection of OH and wide HI absorption toward B0218+357
• The Quintuple Quasar: Mass Models and Interpretation
• The Redshift of a Lensing Galaxy in PMN J0134-0931
• The Quintuple Quasar: Radio and Optical Observations

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