HI Intensity Mapping for Clustering-Based Redshift Estimation

Abstract

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 HI (21cm) spectral line emission. We construct a redshift distribution estimator, which we test using simulations. We utilise the S3-SAX catalogue which includes HI emission information for each galaxy, which we use to construct HI intensity maps. We also make use of simulated LSST and Euclid-like photometry enabling us to apply the HI clustering calibration to realistic simulated photometric redshifts. While taking into account important limitations to HI 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.

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Cited by in corpus (14)

• Impact of Foregrounds on HI Intensity Mapping Cross-Correlations with Optical Surveys
• Cosmology Intertwined: A Review of the Particle Physics, Astrophysics, and Cosmology Associated with the Cosmological Tensions and Anomalies
• Gravitational waves $\times$ HI intensity mapping: cosmological and astrophysical applications
• An Intensity Mapping Constraint on the CO-Galaxy Cross Power Spectrum at Redshift ~ 3
• From EMBER to FIRE: predicting high resolution baryon fields from dark matter simulations with Deep Learning
• Multipole expansion for HI intensity mapping experiments: simulations and modelling
• Detecting the power spectrum turnover with HI intensity mapping
• The HI-halo mass relation at redshift $z\sim 1$ from the Minkowski functionals of 21 cm intensity maps
• Testing gravity with gravitational waves $\times$ electromagnetic probes cross-correlations
• A multi-tracer empirically-driven approach to line-intensity mapping lightcones
• Recovering 21-cm signal from simulated FAST intensity maps
• Prospects for cosmic magnification measurements using HI intensity mapping
• Mapping Large-Scale-Structure Evolution over Cosmic Times
• Clustering redshifts with the 21cm-galaxy cross-bispectrum