Evidence of the Missing Baryons from the Kinematic Sunyaev-Zeldovich Effect in Planck Data
Abstract
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.
- Publication:
-
Physical Review Letters
- Pub Date:
- November 2015
- DOI:
- arXiv:
- arXiv:1504.04011
- Bibcode:
- 2015PhRvL.115s1301H
- Keywords:
-
- 98.70.Vc;
- 98.52.Eh;
- 98.62.Py;
- 98.65.Hb;
- Background radiations;
- Elliptical galaxies;
- Distances redshifts radial velocities;
- spatial distribution of galaxies;
- Intracluster matter;
- cooling flows;
- Astrophysics - Cosmology and Nongalactic Astrophysics
- E-Print:
- Discussion on upper limits on kSZ dipole dropped to fit PRL length requirements. This version matches accepted version in Physical Review Letters