New lens candidates in CFHTLS Virtual Observatory Resource

Authors
  1. Paraficz D.
  2. Courbin F.
  3. Tramacere A.
  4. Joseph R.
  5. Metcalf R.B.,Kneib J.-P.
  6. Dubath P.
  7. Droz D.
  8. Filleul F.
  9. Ringeisen D.
  10. Schafer C.
  11. Published by
    CDS
Abstract

We present the results of a new search for galaxy-scale strong lensing systems in CFHTLS Wide. Our lens-finding technique involves a preselection of potential lens galaxies, applying simple cuts in size and magnitude. We then perform a Principal Component Analysis of the galaxy images, ensuring a clean removal of the light profile. Lensed features are searched for in the residual images using the clustering topometric algorithm DBSCAN. We find 1098 lens candidates that we inspect visually, leading to a cleaned sample of 109 new lens candidates. Using realistic image simulations we estimate the completeness of our sample and show that it is independent of source surface brightness, Einstein ring size (image separation) or lens redshift. We compare the properties of our sample to previous lens searches in CFHTLS. Including the present search, the total number of lenses found in CFHTLS amounts to 678, which corresponds to ~4 lenses per square degree down to i(AB)=24.8. This is equivalent to ~60.000 lenses in total in a survey as wide as Euclid, but at the CFHTLS resolution and depth.

Keywords
  1. surveys
  2. gravitational-lensing
  3. galaxies
  4. photometry
Bibliographic source Bibcode
2016A&A...592A..75P
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/592/A75
IVOA Identifier IVOID
ivo://CDS.VizieR/J/A+A/592/A75
Document Object Identifer DOI
doi:10.26093/cds/vizier.35920075

Access

Web browser access HTML
https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/592/A75
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/592/A75
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/592/A75
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https://tapvizier.cds.unistra.fr/TAPVizieR/tap
Run SQL-like queries with TAP-enabled clients (e.g., TOPCAT).
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/592/A75/table1?
https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/592/A75/table1?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/592/A75/table1?
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/592/A75/tablea1?
https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/592/A75/tablea1?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/592/A75/tablea1?
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/592/A75/tablea2?
https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/592/A75/tablea2?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/592/A75/tablea2?

History

2016-12-05T13:18:41Z
Resource record created
2016-12-05T13:18:41Z
Created
2018-07-02T11:05:20Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr