Synergies between intensity maps of hydrogen lines
Loading...
Date
2018
Journal Title
Journal ISSN
Volume Title
Publisher
Oxford University Press
Abstract
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.
Description
Keywords
Cosmology, Large-scale structure of the Universe, Cosmological parameters, Miscellaneous.
Citation
Fonseca, J. et al. (2018). Synergies between intensity maps of hydrogen lines. Monthly Notices of the Royal Astronomical Society, 479: 3490