Probing the missing baryons with the Sunyaev-Zel'dovich effect from filaments

Abstract

Observations of galaxies and galaxy clusters in the local universe can account for only $\sim 10\%$ of the total baryon content. Cosmological simulations predict that the `missing baryons' are spread throughout filamentary structures in the cosmic web, forming a low-density gas with temperatures of $10^5-10^7$K. We search for this warm-hot intergalactic medium (WHIM) by stacking the Planck Compton $y$-parameter map of the thermal Sunyaev-Zel'dovich (tSZ) effect for 1,002,334 pairs of CMASS galaxies from the Sloan Digital Sky Survey. We model the contribution from the galaxy halo pairs assuming spherical symmetry, finding a residual tSZ signal at the $2.9\mbox{$σ$}$ level from a stacked filament of length $10.5h^{-1}\mathrm{Mpc}$ with a Compton parameter magnitude $y=(0.6\pm 0.2)\times 10^{-8}$. We consider possible sources of contamination and conclude that bound gas in haloes may contribute only up to $20\%$ of the measured filamentary signal. To estimate the filament gas properties we measure the gravitational lensing signal for the same sample of galaxy pairs; in combination with the tSZ signal, this yields an inferred gas density of ${\rho }_{\mathrm{b}}=(5.5\pm 2.9)\times \overline{{\rho }_{\mathrm{b}}}$ with a temperature $T=(2.7\pm 1.7)\times 10^6$K. This result is consistent with the predicted WHIM properties, and overall the filamentary gas can account for $11\pm 7\%$ of the total baryon content of the Universe. We also see evidence that the gas filament extends beyond the galaxy pair. Averaging over this longer baseline boosts the significance of the tSZ signal and increases the associated baryon content to $28\pm 12\%$ of the global value.

arXiv comment13 pages, 8 figures; accepted for publication in A&A

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