Year: 2009
Type: article
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.
Source: The Astrophysical Journal
Authors: Jeffrey M. Kubo, Hossein Khiabanian, Ian P. Dell'Antonio, David Wittman, J. Anthony Tyson
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2020192963