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Prokhorov, D. A.,Dubois, Y.,Nagataki, S.,Akahori, T.,Yoshikawa, K. Blackwell Publishing Ltd 2011 MONTHLY NOTICES- ROYAL ASTRONOMICAL SOCIETY Vol.415 No.3
<P><B>ABSTRACT</B></P><P>The Sunyaev–Zel’dovich (hereinafter SZ) effect is a promising tool to derive the gas temperature of galaxy clusters. Approximation of a spherically symmetric gas distribution is usually used to determine the temperature structure of galaxy clusters, but this approximation cannot properly describe merging galaxy clusters. The methods used so far, which do not assume the spherically symmetric distribution, permit us to derive 2D temperature maps of merging galaxy clusters. In this paper, we propose a method to derive the standard temperature deviation and temperature variance along the line of sight, which permits us to analyse the 3D temperature structure of galaxy clusters by means of the thermal SZ effect. We also propose a method to reveal merger shock waves in galaxy clusters by analysing the presence of temperature inhomogeneities along the line of sight.</P>
Galaxies flowing in the oriented saddle frame of the cosmic web
Kraljic, K,Pichon, C,Dubois, Y,Codis, S,Cadiou, C,Devriendt, J,Musso, M,Welker, C,Arnouts, S,Hwang, H S,Laigle, C,Peirani, S,Slyz, A,Treyer, M,Vibert, D Oxford University Press 2019 Monthly notices of the Royal Astronomical Society Vol.483 No.3
COSMOS2015 photometric redshifts probe the impact of filaments on galaxy properties
Laigle, C,Pichon, C,Arnouts, S,McCracken, H J,Dubois, Y,Devriendt, J,Slyz, A,Le Borgne, D,Benoit-Lé,vy, A,Hwang, Ho Seong,Ilbert, O,Kraljic, K,Malavasi, N,Park, Changbom,Vibert, D Oxford University Press 2018 MONTHLY NOTICES- ROYAL ASTRONOMICAL SOCIETY Vol.474 No.4
<P>The variation of galaxy stellar masses and colour types with the distance to projected cosmic filaments are quantified using the precise photometric redshifts of the COSMOS2015 catalogue extracted from Cosmological Evolution Survey (COSMOS) field (2 deg(2)). Realistic mock catalogues are also extracted from the lightcone of the cosmological hydrodynamical simulation HORIZON-AGN. They show that the photometric redshift accuracy of the observed catalogue (sigma(z) < 0.015 at M-* > 10(10)M(circle dot) and z < 0.9) is sufficient to provide two-dimensional (2D) filaments that closely match their projected three-dimensional (3D) counterparts. Transverse stellar mass gradients are measured in projected slices of thickness 75 Mpc between 0.5 < z < 0.9, showing that the most massive galaxies are statistically closer to their neighbouring filament. At fixed stellar mass, passive galaxies are also found closer to their filament, while active star-forming galaxies statistically lie further away. The contributions of nodes and local density are removed from these gradients to highlight the specific role played by the geometry of the filaments. We find that the measured signal does persist after this removal, clearly demonstrating that proximity to a filament is not equivalent to proximity to an overdensity. These findings are in agreement with gradients measured in both 2D and 3D in the HORIZON-AGN simulation and those observed in the spectroscopic surveys VIPERS and GAMA (which both rely on the identification of 3D filaments). They are consistent with a picture in which the influence of the geometry of the large-scale environment drives anisotropic tides that impact the assembly history of galaxies, and hence their observed properties.</P>
Group quenching and galactic conformity at low redshift
Treyer, M,Kraljic, K,Arnouts, S,de la Torre, S,Pichon, C,Dubois, Y,Vibert, D,Milliard, B,Laigle, C,Seibert, M,Brown, M J I,Grootes, M W,Wright, A H,Liske, J,Lara-Lopez, M A,Bland-Hawthorn, J Oxford University Press 2018 MONTHLY NOTICES- ROYAL ASTRONOMICAL SOCIETY Vol.477 No.2