HI absorption in a gravitational lens at z ∼ 0.7645

  title={HI absorption in a gravitational lens at z ∼ 0.7645},
  author={Nissim Kanekar and F. H. Briggs Kapteyn Institute and The Netherlands Rsaa and The Australian National University and Australia.},
  journal={Astronomy and Astrophysics},
We have used the Westerbork Synthesis Radio Telescope to detect HI 21 cm absorption at $z \sim 0.7645$ in the gravitational lens system towards PMN J0134-0931. The 21 cm 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… Expand

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