Finding the Missing Baryons Using CMB as a Backlight

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dc.creatorHo, Shirley
dc.creatorDedeo, Simon
dc.creatorSpergel, David
dc.date2009-03-16
dc.date.accessioned2026-07-07T12:53:05Z
dc.date.available2026-07-07T12:53:05Z
dc.descriptionWe present a new method for detecting the missing baryons by generating a template for the kinematic Sunyaev-Zel'dovich effect. The template is computed from the product of a reconstructed velocity field with a galaxy field; we find that the combination of a galaxy redshift survey such as SDSS and a CMB survey such as ACT and PLANCK can detect the kSZ, and thus the ionized gas, at significant signal-to-noise. Unlike other techniques that look for hot gas or metals, this approach directly detects the electrons in the IGM through their signature on the CMB. The estimated signal-to-noise for detecting the galaxy-momentum kSZ cross-correlation is 4, 9, and 12 for ACT (with survey area of 2000 $\mathrm{deg}^2$) with SDSS-DR4, SDSS3 and ADEPT respectively. The estimated signal-to-noise for PLANCK with SDSS-DR4, SDSS3 and ADEPT is 11, 23, and 32. Our method provides a new mean for determining properties of the ionized gas in the Universe. We provide galaxy momentum templates constructed from Sloan Digital Sky Survey online at our website at http://www.astro.princeton.edu/~shirley/SZ/SZ.html. The predicted correlation coefficients are provided along with the momentum maps. One can download the momentum templates and cross-correlate directly with CMB maps from ACT and PLANCK to detect the missing baryons.
dc.description11 pages, 5 figures, to be submitted to PRD; momentum templates and analytical code at: http://www.astro.princeton.edu/~shirley/SZ/SZ.html
dc.identifierhttps://arxiv.org/abs/0903.2845
dc.identifierhttp://arxiv.org/abs/0903.2845
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/223503
dc.subjectCosmology and Nongalactic Astrophysics
dc.titleFinding the Missing Baryons Using CMB as a Backlight
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