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20 April 2024

» arxiv » 1504.5587

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Space Warps II. New Gravitational Lens Candidates from the CFHTLS Discovered through Citizen Science
Anupreeta More ; Aprajita Verma ; Phil Marshall ; Surhud More ; Elisabeth Baeten ; Julianne Wilcox ; Christine Macmillan ; Claude Cornen ; Amit Kapadia ; Michael Parrish ; Chris Snyder ; Chris Davis ; Raphael Gavazzi ; Chris Lintott ; Robert Simpson ; David Miller ; Arfon M. Smith ; Edward Paget ; Prasenjit Saha ; Rafael Kueng ; Tom Collett ; Matthias Tecza ; Michael Baumer ;
Date:	21 Apr 2015
Abstract:	We report the discovery of 28 promising and a total of 58 new lens candidates from the CFHT Legacy Survey (CFHTLS) based on about 11 million classifications performed by citizen scientists as part of the first Space Warps lens search. The goal of the blind lens search was to identify lenses missed by lens finding robots (the RingFinder on galaxy scales and ArcFinder on group/cluster scales), which have been previously used to mine the CFHTLS for lenses. We compare some properties of lens samples detected by these algorithms to the SpaceWarps sample and found that they are broadly similar. The image separation distribution calculated from the SpaceWarps discovered sample shows that our previous constraints on the average density profile of the lens population are robust. Space Warps recovers about 60% of the known sample and the new candidates show a richer variety compared to the lenses found by the two robots. We find that analyzing only those classifications which are performed by the high power volunteers, Space Warps can achieve a detection rate of up to 75% for the known lens sample. Training and calibration of the performance of citizen scientists is crucial for the success of Space Warps. We also present the SIMCT pipeline, used for generating a sample of realistic simulated lensed images in the CFHTLS, and a sample of duds and false positives used in the training. Such a training sample has a legacy value for testing future lens finding algorithms. We make our training sample publicly available.
Source:	arXiv, 1504.5587
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