2019/11/30 by H. Tanimura, N. Aghanim, V. Bonjean +2
Physics and Astronomy · #astro-ph.CO
paper · pdf · doi:10.1051/0004-6361/201937158
published as A&A 637, A41 (2020) · 11 pages, 9 figures, accepted for publication by A&A
arxiv created 2020/03/24 · arxiv updated 2020/05/13
We studied physical properties of matter in 24,544 filaments ranging from 30 to 100 Mpc in length, identified in the Sloan Digital Sky Survey (SDSS). We stacked the Comptonization y map produced by the Planck Collaboration around the filaments, excluding the resolved galaxy groups and clusters above a mass of ~3*1013 Msun. We detected the thermal Sunyaev-Zel'dovich signal for the first time at a significance of 4.4 sigma in filamentary structures on such a large scale. We also stacked the Planck cosmic microwave background (CMB) lensing convergence map in the same manner and detected the lensing signal at a significance of 8.1 sigma. To estimate physical properties of the matter, we considered an isothermal cylindrical filament model with a density distribution following a beta-model (beta=2/3). Assuming that the gas distribution follows the dark matter distribution, we estimate that the central gas and matter overdensity and gas temperature are overdensity = (19.0 +27.3 -12.1) and temperature = (1.2 +- 0.4)*106 K, which results in a measured baryon fraction of (0.080 +0.116 -0.051) * Omegab.