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

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

2004-12-22

arxiv.org/abs/astro-ph/0412604v1

Astronomy and Astrophysics

Astrophysics

9 pages, 6 figures, A&A submitted

Scientific paper

10.1051/0004-6361:20042600

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.

Affiliated with

Also associated with

No associations

Rating

An optimal filter for the detection of galaxy clusters through weak lensing does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with An optimal filter for the detection of galaxy clusters through weak lensing, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and An optimal filter for the detection of galaxy clusters through weak lensing will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-541972