Measurement of the splashback feature around SZ-selected Galaxy clusters with DES, SPT, and ACT ...

• Main Authors: Shin, Tae-Hyeon, Hartley, William G., et al.
• Format: Article in Journal/Newspaper
• Language: English
• Published: ETH Zurich 2019
• Subjects: galaxies clusters general; galaxies evolution; cosmology observations; South pole
• Online Access: https://dx.doi.org/10.3929/ethz-b-000356174; http://hdl.handle.net/20.500.11850/356174

We present a detection of the splashback feature around galaxy clusters selected using the Sunyaev–Zel’dovich (SZ) signal. Recent measurements of the splashback feature around optically selected galaxy clusters have found that the splashback radius, rₛₚ, is smaller than predicted by N-body simulations. A possible explanation for this discrepancy is that rₛₚ inferred from the observed radial distribution of galaxies is affected by selection effects related to the optical cluster-finding algorithms. We test this possibility by measuring the splashback feature in clusters selected via the SZ effect in data from the South Pole Telescope SZ survey and the Atacama Cosmology Telescope Polarimeter survey. The measurement is accomplished by correlating these cluster samples with galaxies detected in the Dark Energy Survey Year 3 data. The SZ observable used to select clusters in this analysis is expected to have a tighter correlation with halo mass and to be more immune to projection effects and aperture-induced ... : Monthly Notices of the Royal Astronomical Society, 487 (2) ...