Clustering redshifts with the 21cm-galaxy cross-bispectrum

Abstract

The cross-correlation between 21-cm intensity mapping experiments and photometric surveys of galaxies (or any other cosmological tracer with a broad radial kernel) is severely degraded by the loss of long-wavelength radial modes due to Galactic foreground contamination. Higher-order correlators are able to restore some of these modes due to the non-linear coupling between them and the local small-scale clustering induced by gravitational collapse. We explore the possibility of recovering information from the bispectrum between a photometric galaxy sample and an intensity mapping experiment, in the context of the clustering-redshifts technique. We demonstrate that the bispectrum is able to calibrate the redshift distribution of the photometric sample to the required accuracy of future experiments such as the Rubin Observatory, using future single-dish and interferometric 21-cm observations, in situations where the two-point function is not able to do so due to foreground contamination. We also show how this calibration is affected by the photometric redshift width ${\sigma }_{z,0}$ and maximum scale $k_{\max }$. We find that it is important to reach scales $k\gtrsim 0.3h{\mathrm{Mpc}}^{-1}$, with the constraints saturating at around $k\sim 1h{\mathrm{Mpc}}^{-1}$ for next-generation experiments.

20 pages, 8 figures

References in corpus (26)

• Array Programming with NumPy
• The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Cosmological Implications from two Decades of Spectroscopic Surveys at the Apache Point observatory
• The imprints of primordial non-gaussianities on large-scale structure: scale dependent bias and abundance of virialized objects
• Baryon Acoustic Oscillation Intensity Mapping as a Test of Dark Energy
• Measuring primordial non-gaussianity without cosmic variance
• Measurement of 21 cm brightness fluctuations at z ~ 0.8 in cross-correlation
• Late-time cosmology with 21cm intensity mapping experiments
• Calibrating Redshift Distributions Beyond Spectroscopic Limits with Cross-Correlations
• Cosmology and the Bispectrum
• HIRAX: A Probe of Dark Energy and Radio Transients
• Fast Estimator of Primordial Non-Gaussianity from Temperature and Polarization Anisotropies in the Cosmic Microwave Background
• Position-dependent power spectrum of the large-scale structure: a novel method to measure the squeezed-limit bispectrum
• HI constraints from the cross-correlation of eBOSS galaxies and Green Bank Telescope intensity maps
• Fast simulations for intensity mapping experiments
• The-wiZZ: Clustering redshift estimation for everyone
• SKAO HI Intensity Mapping: Blind Foreground Subtraction Challenge
• Recovery of 21 cm intensity maps with sparse component separation
• Impact of Foregrounds on HI Intensity Mapping Cross-Correlations with Optical Surveys
• Strong detection of the CMB lensingxgalaxy weak lensingcross-correlation from ACT-DR4,PlanckLegacy and KiDS-1000
• Priors on Lagrangian bias parameters from galaxy formation modelling
• Patterns of primary beam non-redundancy in close-packed 21 cm array observations
• Cross-correlating radio continuum surveys and CMB lensing: constraining redshift distributions, galaxy bias and cosmology
• Precise and Accurate Cosmology with CMBxLSS Power Spectra and Bispectra
• The HI intensity mapping bispectrum including observational effects
• Reconstructing large scales at cosmic dawn
• The Lyman-$\alpha$ power spectrum - CMB lensing convergence cross-correlation