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Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2019

A Search for Warm/Hot Gas Filaments Between Pairs of SDSS Luminous Red Galaxies

Gary Hinshaw
  • Fonction : Auteur
Ian G. Mccarthy
  • Fonction : Auteur
Ludovic van Waerbeke
  • Fonction : Auteur
Yin-Zhe Ma
Alexander Mead
  • Fonction : Auteur
Alireza Hojjati
  • Fonction : Auteur
Tilman Tröster
  • Fonction : Auteur

Résumé

We search the Planck data for a thermal Sunyaev–Zel’dovich (tSZ) signal due to gas filaments between pairs of Luminous Red Galaxies (LRGs) taken from the Sloan Digital Sky Survey Data Release 12 (SDSS/DR12). We identify ∼260 000 LRG pairs in the DR12 catalogue that lie within 6–10 |$h^{-1} \, \mathrm{Mpc}$| of each other in tangential direction and within 6 |$h^{-1} \, \mathrm{Mpc}$| in radial direction. We stack pairs by rotating and scaling the angular positions of each LRG so they lie on a common reference frame, then we subtract a circularly symmetric halo from each member of the pair to search for a residual signal between the pair members. We find a statistically significant (5.3σ) signal between LRG pairs in the stacked data with a magnitude Δy = (1.31 ± 0.25) × 10^−8. The uncertainty is estimated from two Monte Carlo null tests which also establish the reliability of our analysis. Assuming a simple, isothermal, cylindrical filament model of electron overdensity with a radial density profile proportional to r_c/r (as determined from simulations), where r is the perpendicular distance from the cylinder axis and r_c is the core radius of the density profile, we constrain the product of overdensity and filament temperature to be |$\delta _\mathrm{ c} \times (T_{\rm e}/10^7 \, {\rm K}) \times (r_\mathrm{ c}/0.5h^{-1} \, {\rm Mpc}) = 2.7 \pm 0.5$|⁠. To our knowledge, this is the first detection of filamentary gas at overdensities typical of cosmological large-scale structure. We compare our result to the BAHAMAS suite of cosmological hydrodynamic simulations (McCarthy et al. 2017) and find a slightly lower, but marginally consistent Comptonization excess, Δy = (0.84 ± 0.24) × 10^−8.
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Dates et versions

hal-01982821 , version 1 (02-11-2023)

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Hideki Tanimura, Gary Hinshaw, Ian G. Mccarthy, Ludovic van Waerbeke, Nabila Aghanim, et al.. A Search for Warm/Hot Gas Filaments Between Pairs of SDSS Luminous Red Galaxies. Monthly Notices of the Royal Astronomical Society, 2019, 483 (1), pp.223-234. ⟨10.1093/mnras/sty3118⟩. ⟨hal-01982821⟩
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