Mon. Not. R. Astron. Soc., 482, 1824-1839 (2019/January-2)
EasyCritics - I. Efficient detection of strongly lensing galaxy groups and clusters in wide-field surveys.
STAPELBERG S., CARRASCO M. and MATURI M.
Abstract (from CDS):
We present EasyCritics, an algorithm to detect strongly lensing groups and clusters in wide-field surveys without relying on a direct recognition of arcs. EasyCritics assumes that light traces mass in order to predict the most likely locations of critical curves from the observed fluxes of luminous red early-type galaxies in the line of sight. The positions, redshifts, and fluxes of these galaxies constrain the idealized gravitational lensing potential as a function of source redshift up to five free parameters, which are calibrated on few known lenses. From the lensing potential, EasyCritics derives the critical curves for a given, representative source redshift. The code is highly parallelized, uses fast Fourier methods and, optionally, GPU acceleration in order to process large data sets efficiently. The search of a 1 deg2 field of view requires less than 1 min on a modern quad-core CPU, when using a pixel resolution of 0.25 arcsec px–1. In this first part of a paper series on EasyCritics, we describe the main underlying concepts and present a first demonstration on data from the Canada-France-Hawaii-Telescope Lensing Survey. We show that EasyCritics is able to identify known group- and cluster-scale lenses, including a cluster with two giant arc candidates that were previously missed by automated arc detectors.
© 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
gravitational lensing: strong - methods: data analysis - galaxies: clusters: general - galaxies: elliptical and lenticular, cD - galaxies: groups: general
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