Evidence of the Missing Baryons from the Kinematic Sunyaev-Zeldovich Effect in Planck Data

Bibcode
2015PhRvL.115s1301H
DOI
10.1103/PhysRevLett.115.191301
Hernández-Monteagudo, C.; Ma, Yin-Zhe; Kitaura, Francisco S.; Wang, Wenting; Génova-Santos, R.; Macías-Pérez, Juan; Herranz, Diego
Bibliographical reference

Physical Review Letters, Volume 115, Issue 19, id.191301

Advertised on:
11
2015
Journal
Physical Review Letters
Number of authors
7
IAC number of authors
1
Citations
67
Refereed citations
62
Description
We estimate the amount of the missing baryons detected by the Planck measurements of the cosmic microwave background in the direction of central galaxies (CGs) identified in the Sloan galaxy survey. The peculiar motion of the gas inside and around the CGs unveils values of the Thomson optical depth τT in the range 0.2 - 2 ×1 0-4 , indicating that the regions probed around CGs contain roughly half of the total amount of baryons in the Universe at the epoch where the CGs are found. If baryons follow dark matter, the measured τT's are compatible with the detection of all of the baryons existing inside and around the CGs.
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