Research and Development for HI Intensity Mapping

Timbie, Peter; Ahmed, Zeeshan; Alonso, David; Amin, Mustafa A.; Ansari, R.; Arena, Evan J.; Bandura, Kevin; Beardsley, Adam P.; Bull, Philip; Castorina, Emanuele; Chang, Tzu‐Ching; Davé, Romeel; Engelen, Alexander van; Ewall‐Wice, Aaron; Ferraro, Simone; Foreman, Simon; Frisch, J.; Green, Daniel; Holder, G. P.; Jacobs, Daniel; Dillon, Joshua S.; Karagiannis, Dionysios; Kaurov, Alexander A.; Knox, L.; Kuhn, Emily R.; Liu, Adrian; Ma, Yin-Zhe; Masui, Kiyoshi; McClintock, Thomas; Moodley, Kavilan; Münchmeyer, Moritz; Newburgh, Laura; Nomerotski, A.; O’Connor, P.; Obuljen, Andrej; Padmanabhan, Hamsa; Parkinson, David; Perdereau, O.; Rapetti, David; Saliwanchik, B. R.; Sehgal, Neelima; Shaw, J. Richard; Sheehy, C. D.; Sheldon, E.; Shirley, R.; Silverstein, Eva; Slatyer, Tracy R.; Slosar, Anže; Stebbins, Albert; Tucker, Gregory S.; Tyndall, William; Villaescusa-Navarro, Francisco; Wulf, Dallas

doi:10.2172/1558438

2019

DOI: 10.2172/1558438

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Research and Development for HI Intensity Mapping

Peter Timbie¹,

Zeeshan Ahmed²,

David Alonso³

et al.

Abstract: Development of the hardware, data analysis, and simulation techniques for large compact radio arrays dedicated to mapping the 21 cm line of neutral hydrogen gas has proven to be more difficult than imagined twenty years ago when such telescopes were first proposed. Despite tremendous technical and methodological advances, there are several outstanding questions on how to optimally calibrate and analyze such data. On the positive side, it has become clear that the outstanding issues are purely technical in natu… Show more

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Cited by 3 publications

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Unveiling the Universe with emerging cosmological probes

et al. 2022

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The detection of the accelerated expansion of the Universe has been one of the major breakthroughs in modern cosmology. Several cosmological probes (Cosmic Microwave Background, Supernovae Type Ia, Baryon Acoustic Oscillations) have been studied in depth to better understand the nature of the mechanism driving this acceleration, and they are being currently pushed to their limits, obtaining remarkable constraints that allowed us to shape the standard cosmological model. In parallel to that, however, the percent precision achieved has recently revealed apparent tensions between measurements obtained from different methods. These are either indicating some unaccounted systematic effects, or are pointing toward new physics. Following the development of CMB, SNe, and BAO cosmology, it is critical to extend our selection of cosmological probes. Novel probes can be exploited to validate results, control or mitigate systematic effects, and, most importantly, to increase the accuracy and robustness of our results. This review is meant to provide a state-of-art benchmark of the latest advances in emerging “beyond-standard” cosmological probes. We present how several different methods can become a key resource for observational cosmology. In particular, we review cosmic chronometers, quasars, gamma-ray bursts, standard sirens, lensing time-delay with galaxies and clusters, cosmic voids, neutral hydrogen intensity mapping, surface brightness fluctuations, stellar ages of the oldest objects, secular redshift drift, and clustering of standard candles. The review describes the method, systematics, and results of each probe in a homogeneous way, giving the reader a clear picture of the available innovative methods that have been introduced in recent years and how to apply them. The review also discusses the potential synergies and complementarities between the various probes, exploring how they will contribute to the future of modern cosmology.

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Unveiling the Universe with emerging cosmological probes

et al. 2022

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Multi-tracer intensity mapping: cross-correlations, line noise & decorrelation

Schaan

White

2021

J. Cosmol. Astropart. Phys.

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Line intensity mapping (LIM) is a rapidly emerging technique for constraining cosmology and galaxy formation using multi-frequency, low angular resolution maps. Many LIM applications crucially rely on cross-correlations of two line intensity maps, or of intensity maps with galaxy surveys or galaxy/CMB lensing. We present a consistent halo model to predict all these cross-correlations and enable joint analyses, in 3D redshift-space and for 2D projected maps. We extend the conditional luminosity function formalism to the multi-line case, to consistently account for correlated scatter between multiple galaxy line luminosities. This allows us to model the scale-dependent decorrelation between two line intensity maps, a key input for foreground rejection and for approaches that estimate auto-spectra from cross-spectra. This also enables LIM cross-correlations to reveal astrophysical properties of the interstellar medium inacessible with LIM auto-spectra. We expose the different sources of luminosity scatter or “line noise” in LIM, and clarify their effects on the 1-halo and galaxy shot noise terms. In particular, we show that the effective number density of halos can in some cases exceed that of galaxies, counterintuitively. Using observational and simulation input, we implement this halo model for the Hα, [Oiii], Lyman-α, CO and [Cii] lines. We encourage observers and simulators to measure galaxy luminosity correlation coefficients for pairs of lines whenever possible. Our code is publicly available at https://github.com/EmmanuelSchaan/HaloGen/tree/LIM. In a companion paper, we use this halo model formalism and code to highlight the degeneracies between cosmology and astrophysics in LIM, and to compare the LIM observables to galaxy detection for a number of surveys.

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Testing the equivalence principle on cosmological scales using the odd multipoles of galaxy cross-power spectrum and bispectrum

Umeh¹,

Koyama²,

Crittenden³

2021

J. Cosmol. Astropart. Phys.

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One of the cornerstones of general relativity is the equivalence principle. However, the validity of the equivalence principle has only been established on solar system scales for standard matter fields; this result cannot be assumed to hold for the non-standard matter fields that dominate the gravitational dynamics on cosmological scales. Here we show how the equivalence principle may be tested on cosmological scales for non-standard matter fields using the odd multipoles of the galaxy cross-power spectrum and bispectrum. This test makes use of the imprint on the galaxy cross-power spectrum and bispectrum by the parity-violating general relativistic deformations of the past-light cone, and assumes that galaxies can be treated as test particles that are made of baryons and cold dark matter. This assumption leads to a non-zero galaxy-baryon relative velocity if the equivalence principle does not hold between baryons and dark matter. We show that the relative velocity can be constrained to be less than 28% of the galaxy velocity using the cross-power spectrum of the HI intensity mapping/Hα galaxy survey and the bispectrum of the Hα galaxy survey.

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Research and Development for HI Intensity Mapping

Cited by 3 publications

References 72 publications

Unveiling the Universe with emerging cosmological probes

Unveiling the Universe with emerging cosmological probes

Multi-tracer intensity mapping: cross-correlations, line noise & decorrelation

Testing the equivalence principle on cosmological scales using the odd multipoles of galaxy cross-power spectrum and bispectrum

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