HI intensity mapping for clustering-based redshift estimation
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Volume
482
Pagination
3341 - 3355
Publisher
DOI
10.1093/mnras/sty2928
Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Issue
ISSN
0035-8711
Metadata
Show full item recordAbstract
Precision cosmology requires accurate galaxy redshifts, but next-generation optical surveys will observe unprecedented numbers of resolved galaxies, placing strain on the amount of spectroscopic follow-up required. We show how useful information can be gained on the redshift distributions of optical galaxy samples from spatial cross-correlations with intensity maps of unresolved H I (21 cm) spectral-line emission. We construct a redshift distribution estimator, which we test using simulations. We utilize the S3-SAX catalogue that includes H I emission information for each galaxy, which we use to construct H I intensity maps. We also make use of simulated LSST and Euclid-like photometry enabling us to apply the H I clustering calibration to realistic simulated photometric redshifts. While taking into account important limitations to H I intensity mapping such as lost k modes from foreground cleaning and poor angular resolution due to large receiver beams, we show that excellent constraints on redshift distributions can be provided for an optical photometric sample.
Authors
Cunnington, S; Harrison, I; Pourtsidou, A; Bacon, DCollections
- Physics and Astronomy [1329]