Weak lensing with 21 cm intensity mapping at z ∼ 2–3

Alkistis Pourtsidou, R. B. Metcalf

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We study how 21 cm intensity mapping can be used to measure gravitational lensing over a wide range of redshift. This can extend weak lensing measurements to higher redshifts than are accessible with conventional galaxy surveys. We construct a convergence estimator taking into account the discreteness of galaxies and calculate the expected noise level as a function of redshift and telescope parameters. At z ∼ 2–3, we find that a telescope array with a collecting area ∼0.2 km2 spread over a region with diameter ∼2 km would be sufficient to measure the convergence power spectrum to high accuracy for multipoles between 10 and 1000. We show that these measurements can be used to constrain interacting dark energy models.
Original languageEnglish
Pages (from-to)L36-L40
JournalMonthly Notices of the Royal Astronomical Society
Issue number1
Early online date3 Jan 2014
Publication statusPublished - 21 Mar 2014


  • gravitational lensing: weak
  • cosmology: theory
  • dark energy
  • large-scale structure of Universe


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