Journal
PHYSICAL REVIEW D
Volume 96, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.96.043515
Keywords
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Funding
- Science and Technology Facilities Council
- Science Technology Facilities Council
- European Research Council
- Beecroft Trust
- South African Square Kilometre Array project
- Oxford Centre for Astrophysical Surveys
- Hintze Family Charitable Foundation
- National Research Foundation of South Africa [98957]
- Leverhulme Trust
- ESRC [ES/N013956/1] Funding Source: UKRI
- STFC [ST/N000919/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/N000919/1] Funding Source: researchfish
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Imaging surveys of galaxies will have a high number density and angular resolution yet a poor redshift precision. Intensity maps of neutral hydrogen will have accurate redshift resolution yet will not resolve individual sources. Using this complementarity, we show how the clustering redshifts approach proposed for spectroscopic surveys can also be used in combination with intensity mapping observations to calibrate the redshift distribution of galaxies in an imaging survey and, as a result, reduce uncertainties in photometric-redshift measurements. We show how the intensity mapping surveys to be carried out with the MeerKAT, HIRAX and SKA instruments can improve photometric-redshift uncertainties to well below the requirements of DES and LSST. The effectiveness of this method as a function of instrumental parameters, foreground subtraction and other potential systematic errors is discussed in detail.
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