Unveiling cosmological information on small scales with line intensity mapping

Abstract

One of the toughest challenges in modern cosmology is to probe the small scales $k\sim 0.5$Mpc${}^{-1}$ in the matter power spectrum and clustering. We show that such small scales will be accessible via upcoming line-intensity mapping surveys, with carbon monoxide (CO) emission from star-forming galaxies at high redshifts as an example. While these galaxies cannot be individually detected and the two-point correlations of the intensity fluctuation maps is not accessible at these scales, the voxel intensity distribution (VID) of the highly non-Gaussian intensity maps is sensitive to the integrated emission from faint sources. As we describe, the main limitations are due to uncertainties related with the halo mass function and the CO emission model. We show that via the VID, high-redshift next-generation experiments can probe deviations from $\Lambda$CDM of order unity, while stage-3 experiments will be able to probe deviations as small as $\lesssim 10\%$ at least up to $k\sim 10$Mpc${}^{-1}$.

10 pages, 5 figures. Version accepted for publication

References in corpus (16)

• Ultralight scalars as cosmological dark matter
• Understanding Galaxy Evolution through Emission Lines
• A search for ultra-light axions using precision cosmological data
• Measuring primordial non-gaussianity without cosmic variance
• Carbon monoxide line emission as a CMB foreground: tomography of the star-forming universe with different spectral resolutions
• Line-Intensity Mapping: Theory Review
• The impact of ultra-light axion self-interactions on the large scale structure of the Universe
• Cross-correlations as a cosmological carbon monoxide detector
• Carbon Monoxide Intensity Mapping at Moderate Redshifts
• Dissecting the high-z interstellar medium through intensity mapping cross-correlations
• Insights from probability distribution functions of intensity maps
• Closing the window on fuzzy dark matter with the 21cm signal
• First Peek with JWST/NIRCam Wide-Field Slitless Spectroscopy: Serendipitous Discovery of a Strong [O III]/H$\alpha$ Emitter at $z=6.11$
• COMAP Early Science: VII. Prospects for CO Intensity Mapping at Reionization
• COMAP Early Science: II. Pathfinder Instrument
• On estimation of contamination from hydrogen cyanide in carbon monoxide line intensity mapping

Cited by in corpus (6)

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• Measuring the cosmic expansion rate using 21-cm velocity acoustic oscillations
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• Towards Accurate Modeling of Line-Intensity Mapping One-Point Statistics: Including Extended Profiles
• Towards a multi-tracer neutrino mass measurement with line-intensity mapping
• oLIMpus: An Effective Model for Line Intensity Mapping Auto- and Cross- Power Spectra in Cosmic Dawn and Reionization