Line-Intensity Mapping: 2017 Status Report

Abstract

Following the first two annual intensity mapping workshops at Stanford in March 2016 and Johns Hopkins in June 2017, we report on the recent advances in theory, instrumentation and observation that were presented in these meetings and some of the opportunities and challenges that were identified looking forward. With preliminary detections of CO, [CII], Lya and low-redshift 21cm, and a host of experiments set to go online in the next few years, the field is rapidly progressing on all fronts, with great anticipation for a flood of new exciting results. This current snapshot provides an efficient reference for experts in related fields and a useful resource for nonspecialists. We begin by introducing the concept of line-intensity mapping and then discuss the broad array of science goals that will be enabled, ranging from the history of star formation, reionization and galaxy evolution to measuring baryon acoustic oscillations at high redshift and constraining theories of dark matter, modified gravity and dark energy. After reviewing the first detections reported to date, we survey the experimental landscape, presenting the parameters and capabilities of relevant instruments such as COMAP, mmIMe, AIM-CO, CCAT-p, TIME, CONCERTO, CHIME, HIRAX, HERA, STARFIRE, MeerKAT/SKA and SPHEREx. Finally, we describe recent theoretical advances: different approaches to modeling line luminosity functions, several techniques to separate the desired signal from foregrounds, statistical methods to analyze the data, and frameworks to generate realistic intensity map simulations.

99 pages, 48 figures; Endorsement and any comments welcome; To be submitted to Physics Reports

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Cited by in corpus (116)

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• The Cosmic Expansion History from Line-Intensity Mapping
• Broadband Intensity Tomography: Spectral Tagging of the Cosmic UV Background
• Strategies to Detect Dark-Matter Decays with Line-Intensity Mapping
• Gaussian Process Regression for foreground removal in HI intensity mapping experiments
• Neutrino Properties with Ground-Based Millimeter-Wavelength Line Intensity Mapping
• Weak Lensing of Intensity Mapping: the Cosmic Infrared Background
• Intensity mapping with neutral hydrogen and the Hidden Valley simulations
• Intensity mapping cross-correlations II: HI halo models including shot noise
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• PRIYA: A New Suite of Lyman-alpha Forest Simulations for Cosmology
• COMAP Early Science: IV. Power Spectrum Methodology and Results
• A model of spectral line broadening in signal forecasts for line-intensity mapping experiments
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• Comparison of delensing methodologies and assessment of the delensing capabilities of future experiments
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• Constraining the interaction between dark sectors with future HI intensity mapping observations
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• On estimating the cosmic molecular gas density from CO Line Intensity Mapping observations
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• Deconfusing intensity maps with neural networks
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• Constraining the halo-ISM connection through multi-transition carbon monoxide line-intensity mapping
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• Mapping Large-Scale-Structure Evolution over Cosmic Times
• Testing the growth of cosmic structures during the Dark Ages
• Line intensity mapping: a "novel" window to the cosmic web
• Indicator Functions: Distilling the Information from Gaussian Random Fields