Matched filtering with interferometric 21cm experiments

Abstract

A new generation of interferometric instruments is emerging which aim to use intensity mapping of redshifted $21$cm radiation to measure the large-scale structure of the Universe at $z\simeq 1-2$ over wide areas of sky. While these instruments typically have limited angular resolution, they cover huge volumes and thus can be used to provide large samples of rare objects. In this paper we study how well such instruments could find spatially extended large-scale structures, such as cosmic voids, using a matched filter formalism. Such a formalism allows us to work in Fourier space, the natural space for interferometers, and to study the impact of finite $u-v$ coverage, noise and foregrounds on our ability to recover voids. We find that in the absence of foregrounds such instruments would provide enormous catalogs of voids, with high completeness, but that control of foregrounds is key to realizing this goal.

14 pages, 8 figures, minor revisions to match version accepted by MNRAS

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Cited by in corpus (16)

• Detecting Weak Spectral Lines in Interferometric Data through Matched Filtering
• Reconstructing large-scale structure with neutral hydrogen surveys
• A Detection of $z$~2.3 Cosmic Voids from 3D Lyman-$\alpha$ Forest Tomography in the COSMOS Field
• The Zeldovich approximation and wide-angle redshift-space distortions
• Intensity mapping with neutral hydrogen and the Hidden Valley simulations
• Measuring the growth of structure with intensity mapping surveys
• Astrophysics & Cosmology from Line Intensity Mapping vs Galaxy Surveys
• Recovering lost 21 cm radial modes via cosmic tidal reconstruction
• Why Cosmic Voids Matter: Nonlinear Structure & Linear Dynamics
• Synergies between radio, optical and microwave observations at high redshift
• Anatomy of Cosmic Tidal Reconstruction
• Ultra-large-scale approximations and galaxy clustering: debiasing constraints on cosmological parameters
• Understanding matched filters for precision cosmology
• Unveiling the Universe with Emerging Cosmological Probes
• Flat-sky Angular Power Spectra Revisited
• Separation of CMB $\mu$ spectral distortions from foregrounds with poorly defined spectral shapes