An optimal filter for the detection of galaxy clusters through weak lensing

• Verfasst von: Maturi, Matteo [VerfasserIn]
• Verfasst von: Meneghetti, Massimo [VerfasserIn]
• Verfasst von: Bartelmann, Matthias [VerfasserIn]
• Titel: An optimal filter for the detection of galaxy clusters through weak lensing
• Verf.angabe: Matteo Maturi, Massimo Meneghetti, Matthias Bartelmann, Klaus Dolag, Lauro Moscardini
• E-Jahr: 2008
• Jahr: February 2, 2008
• Umfang: 9 S.
• Fussnoten: Gesehen am 26.09.2017
• Titel Quelle: Enthalten in: De.arxiv.org
• Ort Quelle: [S.l.] : Arxiv.org, 1991
• Jahr Quelle: 2008
• Band/Heft Quelle: (2008) Artikel-Nummer 0412604, 9 Seiten
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: Astrophysics
• K10plus-PPN: 1563812096

Abstract

We construct a linear filter optimised for detecting dark-matter halos in weak-lensing data. The filter assumes a mean radial profile of the halo shear pattern and modifies that shape by the noise power spectrum. Aiming at separating dark-matter halos from spurious peaks caused by large-scale structure lensing, we model the noise as being composed of weak lensing by large-scale structures and Poisson noise from random galaxy positions and intrinsic ellipticities. Optimal filtering against the noise requires the optimal filter scale to be smaller than typical halo sizes. Although a perfect separation of halos from spurious large-scale structure peaks is strictly impossible, we use numerical simulations to demonstrate that our filter produces substantially more sensitive, reliable and stable results than the conventionally used aperture-mass statistic.