%0 Generic %1 tanimura2017search %A Tanimura, Hideki %A Hinshaw, Gary %A McCarthy, Ian G. %A Van Waerbeke, Ludovic %A Ma, Yin-Zhe %A Mead, Alexander %A Hojjati, Alireza %A Tröster, Tilman %D 2017 %K filaments hot pairs %T A Search for Warm/Hot Gas Filaments Between Pairs of SDSS Luminous Red Galaxies %U http://arxiv.org/abs/1709.05024 %X We search the Planck data for a thermal Sunyaev-Zel'dovich (tSZ) signal due to gas filaments between pairs of Luminous Red Galaxies (LRG's) taken from the Sloan Digital Sky Survey Data Release 12 (SDSS/DR12). We identify $\sim$260,000 LRG pairs in the DR12 catalog that lie within 6-10 $h^-1 Mpc$ of each other in tangential direction and within 6 $h^-1 Mpc$ 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 (5.3$\sigma$) signal between LRG pairs in the stacked data with a magnitude $\Delta y = (1.31 0.25) 10^-8$. 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 over-density 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 over-density and filament temperature to be $\delta_c (T_e/10^7 \, K) (r_c/0.5h^-1 \, Mpc) = 2.7 0.5$. To our knowledge, this is the first detection of filamentary gas at over-densities 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, $\Delta y = (0.84 0.24) 10^-8$.

@misc{tanimura2017search, abstract = {We search the Planck data for a thermal Sunyaev-Zel'dovich (tSZ) signal due to gas filaments between pairs of Luminous Red Galaxies (LRG's) taken from the Sloan Digital Sky Survey Data Release 12 (SDSS/DR12). We identify $\sim$260,000 LRG pairs in the DR12 catalog 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 (5.3$\sigma$) signal between LRG pairs in the stacked data with a magnitude $\Delta y = (1.31 \pm 0.25) \times 10^{-8}$. 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 over-density 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 over-density and filament temperature to be $\delta_c \times (T_{\rm e}/10^7 \, {\rm K}) \times (r_c/0.5h^{-1} \, {\rm Mpc}) = 2.7 \pm 0.5$. To our knowledge, this is the first detection of filamentary gas at over-densities 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, $\Delta y = (0.84 \pm 0.24) \times 10^{-8}$.}, added-at = {2017-09-18T10:05:27.000+0200}, author = {Tanimura, Hideki and Hinshaw, Gary and McCarthy, Ian G. and Van Waerbeke, Ludovic and Ma, Yin-Zhe and Mead, Alexander and Hojjati, Alireza and Tröster, Tilman}, biburl = {https://www.bibsonomy.org/bibtex/222900307e93260cb8b2bfda1080a8f74/miki}, description = {[1709.05024] A Search for Warm/Hot Gas Filaments Between Pairs of SDSS Luminous Red Galaxies}, interhash = {b1c223febae3590ee7657e26aa829064}, intrahash = {22900307e93260cb8b2bfda1080a8f74}, keywords = {filaments hot pairs}, note = {cite arxiv:1709.05024Comment: 10 pages, 9 figures, submitted to MNRAS}, timestamp = {2017-09-18T10:05:27.000+0200}, title = {A Search for Warm/Hot Gas Filaments Between Pairs of SDSS Luminous Red Galaxies}, url = {http://arxiv.org/abs/1709.05024}, year = 2017 }