Dark Matter Structures In The Deep Lens Survey
Abstract
We present a regularized maximum likelihood weak lensing reconstruction of the Deep Lens Survey F2 field (4 deg^2). High signal-to-noise ratio peaks in our lensing significance map appear to be associated with possible projected filamentary structures. The largest apparent structure extends for over a degree in the field and has contributions from known optical clusters at three redshifts (z ~ 0.3, 0.43, 0.5). Noise in weak lensing reconstructions is known to potentially cause "false positives"; we use Monte Carlo techniques to estimate the contamination in our sample, and find that 10-25% of the peaks are expected to be false detections. For significant lensing peaks we estimate the total signal-to-noise ratio of detection using a method that accounts for pixel-to-pixel correlations in our reconstruction. We also report the detection of a candidate relative underdensity in the F2 field with a total signal-to-noise ratio of ~ 5.5.
Cite
@article{arxiv.0809.5072,
title = {Dark Matter Structures In The Deep Lens Survey},
author = {Jeffrey M. Kubo and Hossein Khiabanian and Ian P. Dell'Antonio and David Wittman and J. Anthony Tyson},
journal= {arXiv preprint arXiv:0809.5072},
year = {2009}
}
Comments
26 Pages, 7 Figures; accepted to ApJ