Query : 2022A&A...666A..97L

2022A&A...666A..97L - Astronomy and Astrophysics, volume 666A, 97 (2022/10-1)

A pair of early- and late-forming galaxy cluster samples: A novel way of studying halo assembly bias assisted by a constrained simulation.


Abstract (from CDS):

The halo assembly bias, a phenomenon referring to dependencies of the large-scale bias of a dark matter halo other than its mass, is a fundamental property of the standard cosmological model. First discovered in 2005 from the Millennium Run simulation, it has been proven very difficult to be detected observationally, with only a few convincing claims of detection so far. The main obstacle lies in finding an accurate proxy of the halo formation time. In this study, by utilizing a constrained simulation that can faithfully reproduce the observed structures larger than 2 Mpc in the local universe, for a sample of 634 massive clusters at z ≤ 0.12, we found their counterpart halos in the simulation and used the mass growth history of the matched halos to estimate the formation time of the observed clusters. This allowed us to construct a pair of early- and late-forming clusters, with a similar mass as measured via weak gravitational lensing, and large-scale biases differing at the ≈3σ level, suggestive of the signature of assembly bias, which is further corroborated by the properties of cluster galaxies, including the brightest cluster galaxy and the spatial distribution and number of member galaxies. Our study paves a way to further detect assembly bias based on cluster samples constructed purely on observed quantities.

Abstract Copyright: © Y.-T. Lin et al. 2022

Journal keyword(s): large-scale structure of Universe - cosmology: observations - galaxies: clusters: general

VizieR on-line data: <Available at CDS (J/A+A/666/A97): table1.dat table2.dat>

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

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