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The origin of peak-offsets in weak-lensing maps
Dietrich, J. P.; Böhnert, A.; Lombardi, M.; Hilbert, S.; Hartlap, J.
AA(Department of Physics and Michigan Center for Theoretical Physics, University of Michigan, 450 Church St, Ann Arbor, MI 48109, USA), AB(ESO, Karl-Schwarzschild-Str. 2, 85748 Garching b. München, Germany), AC(Dipartimento di Fisica, Università degli Studi di Milano, Via Celoria 16, 20133 Milano, Italy), AD(Argelander-Institut für Astronomie, Auf dem Hügel 71, 53121 Bonn, Germany; Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Straße 1, 85741 Garching, Germany), AE(Argelander-Institut für Astronomie, Auf dem Hügel 71, 53121 Bonn, Germany)
Monthly Notices of the Royal Astronomical Society, Volume 419, Issue 4, pp. 3547-3552. (MNRAS Homepage)
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Astronomy Keywords:
gravitational lensing: weak, galaxies: clusters: general
Abstract Copyright:
© 2011 The Authors Monthly Notices of the Royal Astronomical Society © 2011 RAS
Bibliographic Code:


Centroid positions of peaks identified in weak-lensing mass maps often show offsets with respect to other means of identifying halo centres, such as position of the brightest cluster galaxy or X-ray emission centroid. Here we study the effect of projected large-scale structure (LSS), smoothing of mass maps, and shape noise on the weak-lensing peak positions. In addition, we compare the offsets in mass maps to those found in parametric model fits. Using ray-tracing simulations through the Millennium Run N-body simulation, we find that projected LSS does not alter the weak-lensing peak position within the limits of our simulations' spatial resolution, which exceeds the typical resolution of weak-lensing maps. We conclude that projected LSS, although a major contaminant for weak-lensing mass estimates, is not a source of confusion for identifying halo centres. The typically reported offsets in the literature are caused by a combination of shape noise and smoothing alone. This is true for centroid positions derived both from mass maps and model fits.
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