Document detail
ID
oai:arXiv.org:2412.13883
Topic
Astrophysics - Cosmology and Nonga...Author
Sommer, Martin W. Schrabback, Tim Grandis, SebastianCategory
sciences: astrophysics
Year
2024
listing date
3/19/2025
Keywords
weak simulations lensingAbstract
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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