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• W2891246690 abstract "Almost a third of the cosmic baryons are missing at low redshifts, as they reside in the invisible warm-hot intergalactic medium (WHIM). The thermal Sunyaev-Zeldovich (tSZ) effect, which measures the line-of-sight integral of the plasma pressure, can potentially detect this WHIM, although its expected signal is hidden below the noise. Extragalactic dispersion measures (DMs)---obtained through observations of fast radio bursts (FRBs)---are excellent tracers of the WHIM, as they measure the column density of plasma, regardless of its temperature. Here we propose cross correlating DMs and tSZ maps as a new way to find and characterize the missing baryons in the WHIM. Our method relies on the precise ($sim$ arcminute) angular localization of FRBs to assign each burst a DM and a $y$ parameter. We forecast that the signal from the WHIM should be confidently detected in a cross-correlation analysis of $sim10^4$ FRBs, expected to be gathered in a year of operation of the upcoming CHIME and HIRAX radio arrays, confirming the recent tentative detections of filamentary WHIM. Using this technique, future CMB probes (which might lower the tSZ noise) could determine both the temperature of the WHIM and its evolution to within tens of percent. Altogether, DM-tSZ cross correlations hold great promise for studying the baryons in the local Universe." @default.
• W2891246690 created "2018-09-27" @default.
• W2891246690 creator A5034807028 @default.
• W2891246690 creator A5040946565 @default.
• W2891246690 date "2018-11-19" @default.
• W2891246690 modified "2023-09-23" @default.
• W2891246690 title "Finding the missing baryons with fast radio bursts and Sunyaev-Zeldovich maps" @default.
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• W2891246690 doi "https://doi.org/10.1103/physrevd.98.103518" @default.
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