HI and cosmological constraints from intensity mapping, optical, and CMB surveys

Alkistis Pourtsidou, David Bacon, Robert Crittenden

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We forecast constraints on neutral hydrogen (HI) and cosmological parameters using near-term intensity mapping surveys with instruments such as BINGO, MeerKAT, and the SKA, and Stage III and IV optical galaxy surveys. If foregrounds and systematic effects can be controlled - a problem which becomes much easier in cross-correlation - these surveys will provide exquisite measurements of the HI density and bias, as well as measurements of the growth of structure, the angular diameter distance, and the Hubble rate, over a wide range of redshift. We also investigate the possibility of detecting the late time ISW effect using the Planck satellite and forthcoming intensity mapping surveys, finding that a large sky survey with Phase 1 of the SKA can achieve a near optimal detection.
Original languageEnglish
Pages (from-to)4251-4260
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
Early online date14 Jun 2017
Publication statusPublished - Oct 2017


  • astro-ph.CO


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