Skip to content

Synergies between intensity maps of hydrogen lines

Research output: Contribution to journalArticlepeer-review

We study synergies between HI 21cm and Hα intensity map observations, focusing on SKA1-like and SPHEREx-like surveys. We forecast how well such a combination can measure features in the angular power spectrum on the largest scales, that arise from primordial non-Gaussianity and from general relativistic effects. For the first time we consider Doppler, Sachs-Wolfe and integrated SW effects separately. We confirm that the single-tracer surveys on their own cannot detect general relativistic effects and can constrain the non-Gaussianity parameter fNL only slightly better than Planck. Using the multi-tracer technique, constraints on fNL can be pushed down to ∼1. Amongst the general relativistic effects, the Doppler term is detectable with the multi-tracer. The Sachs-Wolfe terms and the integrated SW effect are still not detectable.
Original languageEnglish
Pages (from-to)3490-3497
JournalMonthly Notices of the Royal Astronomical Society
Volume479
Issue number3
Early online date28 Jun 2018
DOIs
Publication statusPublished - 21 Sep 2018

Documents

  • Synergies between intensity maps of hydrogen lines

    Rights statement: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2018 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

    Final published version, 566 KB, PDF document

Relations Get citation (various referencing formats)

ID: 10757725