A partial inventory of observational anisotropies in single-dish line-intensity mapping

Abstract

Line-intensity mapping, being an imperfect observation of the line-intensity field in a cosmological volume, will be subject to various anisotropies introduced in observation. Existing literature in the context of CO and [C II] line-intensity mapping often predicts only the real-space, spherically averaged line-intensity power spectrum, with some works considering anisotropies while examining projection of interloper emission. We explicitly consider a simplified picture of redshift-space distortions and instrumental effects due to limited resolution, and how these distort an isotropic line-intensity signal in real space and introduce strong apparent anisotropies. The results suggest that while signal loss due to limited instrumental resolution is unavoidable, measuring the quadrupole power spectrum in addition to the monopole would still break parameter degeneracies present in monopole-only constraints, even without a measurement of the full anisotropic power spectrum.

12 pages + appendix (16 pages total), 5 figures, 2 tables; thanks to Bryan Scott for highlighting an error in Equation 23 (erratum to be submitted to ApJ)

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Cited by in corpus (13)

• Line-Intensity Mapping: Theory Review
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• Cosmological constraints from line intensity mapping with interlopers
• An Intensity Mapping Constraint on the CO-Galaxy Cross Power Spectrum at Redshift ~ 3
• COMAP Early Science: IV. Power Spectrum Methodology and Results
• A model of spectral line broadening in signal forecasts for line-intensity mapping experiments
• Coupling parsec and gigaparsec scales: primordial non-Gaussianity with multi-tracer intensity mapping
• On estimating the cosmic molecular gas density from CO Line Intensity Mapping observations
• A multi-tracer empirically-driven approach to line-intensity mapping lightcones
• Multipole expansion for 21cm Intensity Mapping power spectrum: forecasted cosmological parameters estimation for the SKA Observatory
• A Multi-messenger view of Cosmic Dawn: Conquering the Final Frontier