Effects of large-scale structure on the accuracy of weak lensing mass measurements

Дата и время публикации : 2010-11-04T09:07:04Z

Авторы публикации и институты :
Henk Hoekstra
Jan Hartlap
Stefan Hilbert
Edo van Uitert

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: submitted to MNRAS; 10 pages, 8 figures
Первичная категория: astro-ph.CO

Все категории : astro-ph.CO

Краткий обзор статьи: Weak gravitational lensing has become an important method to determine the masses of galaxy clusters. The intrinsic shapes of the galaxies are a dominant source of uncertainty, but there are other limitations to the precision that can be achieved. In this paper we revisit a typically ignored source of uncertainty: structure along the line-of sight. Using results from the Millennium Simulation we confirm the validity of analytical calculations that have shown that such random projections are particularly important for studies of the cluster density profile. In general the contribution of large-scale structure to the total error budget is comparable to the statistical errors. We find that the precision of the mass measurement can be improved only slightly by modelling the large-scale structure using readily available data.

Category: Physics