Détail du document
Identifiant
oai:arXiv.org:2412.13883
Sujet
Astrophysics - Cosmology and Nonga...Auteur
Sommer, Martin W. Schrabback, Tim Grandis, SebastianCatégorie
sciences : astrophysique
Année
2024
Date de référencement
19/03/2025
Mots clés
weak simulations lensingRésumé
Galaxy cluster masses estimated from parametric modeling of weak lensing shear observations are known to be biased by inaccuracies in observationally determined centers.
It has recently been shown that such systematic effects can be non-isotropic when centers are derived from X-ray or Compton-Y (Sunyaev-Zeldovich effect) observations, which is often the case in practice.
This fact challenges current methods of accurately correcting for weak lensing mass biases using simulations paired with isotropic empirical miscentering distributions, in particular as the effect on determined masses is currently a dominant source of systematic uncertainty.
We use hydrodynamical cosmological simulations taken from the Magneticum Pathfinder simulations to show that the non-isotropic component of the mass bias can be reduced to within one percent of the mass when considering the center of mass, rather than the bottom of the gravitational potential, as the reference center of a galaxy cluster.
;Comment: 6 pages, 4 figures, MNRAS accepted
Sommer, Martin W.,Schrabback, Tim,Grandis, Sebastian, 2024, Directional miscentering dependence in weak lensing mass bias
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