Mind the gap: the power of combining photometric surveys with intensity mapping

Abstract

The long wavelength modes lost to bright foregrounds in the interferometric 21-cm surveys can partially be recovered using a forward modeling approach that exploits the non-linear coupling between small and large scales induced by gravitational evolution. In this work, we build upon this approach by considering how adding external galaxy distribution data can help to fill in these modes. We consider supplementing the 21-cm data at two different redshifts with a spectroscopic sample (good radial resolution but low number density) loosely modeled on DESI-ELG at $z=1$ and a photometric sample (high number density but poor radial resolution) similar to LSST sample at $z=1$ and $z=4$ respectively. We find that both the galaxy samples are able to reconstruct the largest modes better than only using 21-cm data, with the spectroscopic sample performing significantly better than the photometric sample despite much lower number density. We demonstrate the synergies between surveys by showing that the primordial initial density field is reconstructed better with the combination of surveys than using either of them individually. Methodologically, we also explore the importance of smoothing the density field when using bias models to forward model these tracers for reconstruction.

arXiv comment16 pages, 7 Figures

References in corpus (53)

• Cosmology at Low Frequencies: The 21 cm Transition and the High-Redshift Universe
• Resumming Cosmological Perturbations via the Lagrangian Picture: One-loop Results in Real Space and in Redshift Space
• The HIPASS catalogue: Omega_HI and environmental effects on the HI mass function of galaxies
• Damped Lyman Alpha Systems at z<1.65: The Expanded SDSS HST Sample
• Measurement of 21 cm brightness fluctuations at z ~ 0.8 in cross-correlation
• Bayesian physical reconstruction of initial conditions from large scale structure surveys
• The Arecibo Legacy Fast ALFA Survey: X. The HI Mass Function and Omega_HI From the 40% ALFALFA Survey
• Determination of z~0.8 neutral hydrogen fluctuations using the 21 cm intensity mapping auto-correlation
• Nonlinear perturbation theory with halo bias and redshift-space distortions via the Lagrangian picture
• Convolution Lagrangian perturbation theory for biased tracers
• The Evolution of Lyman Limit Absorption Systems to Redshift Six
• FastPM: a new scheme for fast simulations of dark matter and halos
• Ingredients for 21cm intensity mapping
• Lack of clustering in low-redshift 21-cm intensity maps cross-correlated with 2dF galaxy densities
• The Neutral Hydrogen Cosmological Mass Density at z=5
• HIRAX: A Probe of Dark Energy and Radio Transients
• The ESO UVES Advanced Data Products Quasar Sample - II. Cosmological Evolution of the Neutral Gas Mass Density
• The HI content of star-forming galaxies at z = 0.24
• ELUCID - Exploring the Local Universe with reConstructed Initial Density field I: Hamiltonian Markov Chain Monte Carlo Method with Particle Mesh Dynamics
• Detection of HI in distant galaxies using spectral stacking
• Cosmological evolution of atomic gas and implications for 21 cm HI absorption
• Modeling Biased Tracers at the Field Level
• The Zeldovich approximation
• Towards optimal extraction of cosmological information from nonlinear data
• The Gaussian streaming model and Lagrangian effective field theory
• Iterative initial condition reconstruction
• The cosmology dependence of galaxy clustering and lensing from a hybrid $N$-body-perturbation theory model
• Neutral atomic hydrogen (HI) gas evolution in field galaxies at z ~ 0.1 and 0.2
• A halo model for cosmological neutral hydrogen: abundances and clustering
• Simulations and symmetries
• Cosmological Reconstruction From Galaxy Light: Neural Network Based Light-Matter Connection
• On the spatial distribution of neutral hydrogen in the Universe: bias and shot-noise of the HI Power Spectrum
• A rigorous EFT-based forward model for large-scale structure
• High-redshift post-reionization cosmology with 21cm intensity mapping
• The SDSS-DR12 large-scale cross-correlation of Damped Lyman Alpha Systems with the Lyman Alpha Forest
• The Statistical Properties of Neutral Gas at z<1.65 from UV Measurements of Damped Lyman Alpha Systems
• Halo bias in Lagrangian Space: Estimators and theoretical predictions
• Reconstructing large-scale structure with neutral hydrogen surveys
• Inflation and Early Dark Energy with a Stage II Hydrogen Intensity Mapping Experiment
• The foreground wedge and 21 cm BAO surveys
• Statistical properties of damped Lyman-alpha systems from Sloan Digital Sky Survey DR12
• Cosmology with dropout selection: Straw-man surveys and CMB lensing
• Modeling CMB Lensing Cross Correlations with {\sc CLEFT}
• Nonlinear reconstruction
• An accurate low-redshift measurement of the cosmic neutral hydrogen density
• The HI content of dark matter halos at $z\approx 0$ from ALFALFA
• Intensity mapping with neutral hydrogen and the Hidden Valley simulations
• Combining galaxy and 21cm surveys
• The Likelihood for LSS: Stochasticity of Bias Coefficients at All Orders
• Synergies between radio, optical and microwave observations at high redshift
• Anatomy of Cosmic Tidal Reconstruction
• Packed Ultra-wideband Mapping Array (PUMA): Astro2020 RFI Response
• Inflation and Dark Energy from spectroscopy at $z>2$

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