Euclid preparation. XXXII. Evaluating the weaklensing cluster mass biases using the Three Hundred Project hydrodynamical simulations
Abstract
The photometric catalogue of galaxy clusters extracted from ESA Euclid data is expected to be very competitive for cosmological studies. Using dedicated hydrodynamical simulations, we present systematic analyses simulating the expected weaklensing profiles from clusters in a variety of dynamic states and for a wide range of redshifts. In order to derive cluster masses, we use a model consistent with the implementation within the Euclid Consortium of the dedicated processing function and find that when we jointly model the mass and concentration parameter of the NavarroFrenkWhite halo profile, the weaklensing masses tend to be biased low by 510% on average with respect to the true mass, up to z = 0.5. For a fixed value for the concentration c_{200} = 3, the mass bias is decreases to lower than 5%, up to z = 0.7, along with the relative uncertainty. Simulating the weaklensing signal by projecting along the directions of the axes of the moment of inertia tensor ellipsoid, we find that orientation matters: when clusters are oriented along the major axis, the lensing signal is boosted, and the recovered weaklensing mass is correspondingly overestimated. Typically, the weaklensing mass bias of individual clusters is modulated by the weaklensing signaltonoise ratio, which is related to the redshift evolution of the number of galaxies used for weaklensing measurements: the negative mass bias tends to be stronger toward higher redshifts. However, when we use a fixed value of the concentration parameter, the redshift evolution trend is reduced. These results provide a solid basis for the weaklensing mass calibration required by the cosmological application of future cluster surveys from Euclid and Rubin.
 Publication:

Astronomy and Astrophysics
 Pub Date:
 January 2024
 DOI:
 10.1051/00046361/202346058
 arXiv:
 arXiv:2302.00687
 Bibcode:
 2024A&A...681A..67E
 Keywords:

 galaxies: clusters: general;
 galaxies: halos;
 largescale structure of Universe;
 dark matter;
 dark energy;
 cosmology: theory;
 Astrophysics  Cosmology and Nongalactic Astrophysics;
 Astrophysics  Astrophysics of Galaxies
 EPrint:
 Accepted for publication in Astronomy &