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= KiDS Strong Lensing

This is the Kapteyn/OmegaCEN homepage for the KiDS Strong Lensing project.

{{:projects:kids:lensing:stronglensing:group.jpg?500|}}

== Status (last updated 1 Sep 2014 (GVK))

* Strongly-lensed QSO portal: [[projects:kids:lensing:stronglensing:stronglensingqso|Strongly Lensed QSOs with KiDS]]
* Aug14: Added KiDS-LOW-LRG-TWO package to support KiDS/BLF challenge
* May14: "No KiDS Lens No Glory" May 1-2, 2014 meeting at Kapteyn.  Euclid SLWG lens finding specialists applied their strong lens finding tools to KiDS data:
   * [[https://docs.google.com/document/d/1eguKa26dbAQ34HXD-jdMaytdDjIRiJrKa-KNUiXNmsA/edit?usp=sharing | meeting collaborative notes]] 

== KiDS testset for lens finding

We have prepared datapacks: 

^Set^Datapack^HumVI rgb^Cut-out view^Description^
|KiDS-LOWZ-LRG-TWO| [[http://www.astro.rug.nl/~verdoes/temp/KiDS-LOWZ-LRG-TWO.tar | KiDS-LOWZ-LRG-TWO.tar]] | - | [[http://www.astro.rug.nl/~verdoes/temp/KiDS-LOWZ-LRG-TWO/cutouts.html | cutouts.html]] | Second set of photometrically selected z<0.4 Luminous Red Galaxies. See first set, KiDS-LOWZ-LRG package, below for details |
|KiDS-START| [[http://www.astro.rug.nl/~buddel/research/stronglenses/may2014meeting_HumVI/KiDS-START.tar|KiDS-START.tar]] | in KiDS-START.tar | [[http://www.astro.rug.nl/~verdoes/temp/KiDS-START/cutouts.html | cutouts.html]] | Hand-picked start set |
|KiDS-HIGHZ-LRG| [[http://ds.astro.rug.astro-wise.org:8000/KiDS-HIGHZ-LRG.tar | KiDS-HIGHZ-LRG.tar]] | [[http://www.astro.rug.nl/~buddel/research/stronglenses/may2014meeting_HumVI/KiDS-HIGHZ-LRG.HumVI.tar|KiDS-HIGHZ-LRG.HumVI.tar]] [[http://www.intra.astro.rug.nl/~buddel/research/stronglenses/may2014meeting_HumVI/KiDS-HIGHZ-LRG.HumVI-newscale.tar|newscale]] | [[http://www.astro.rug.nl/~verdoes/temp/KiDS-HIGHZ-LRG/cutouts.html | cutouts.html]] | Photometrically selected z>0.4 Luminous Red Galaxies |
|KiDS-LOWZ-LRG| [[http://ds.astro.rug.astro-wise.org:8000/KiDS-LOWZ-LRG.tar | KiDS-LOWZ-LRG.tar]] | [[http://www.astro.rug.nl/~buddel/research/stronglenses/may2014meeting_HumVI/KiDS-LOWZ-LRG.HumVI.tar|KiDS-LOWZ-LRG.HumVI.tar]] | [[http://www.astro.rug.nl/~verdoes/temp/KiDS-LOWZ-LRG/cutouts.html | cutouts.html]] | Photometrically selected z<0.4 Luminous Red Galaxies |
|KiDS-QSO| | | | soon: Photometrically selected QSOs |
|KiDS-TEST|[[https://astrodrive.astro.rug.nl/public.php?service=files&t=cf4154284eedfffbfd8fdb76a9d21bba | KiDS-TEST.tar]] | [[http://www.astro.rug.nl/~buddel/research/stronglenses/may2014meeting_HumVI/KiDS-TEST.HumVI.tar|KiDS-TEST.HumVI.tar]] | [[http://www.astro.rug.nl/~verdoes/temp/KiDS-TEST/cutouts.html | cutouts.html]] | test set using z>0.4 LRG selection.|
|KiDS-TEST-LARGE-GAL|[[https://astrodrive.astro.rug.nl/public.php?service=files&t=16e9d6c157e47e6462883dc61ccc499f | KiDS-TEST-LARGE-GAL.tar]] | [[http://www.astro.rug.nl/~buddel/research/stronglenses/may2014meeting_HumVI/KiDS-TEST-LARGE-GAL.HumVI.tar|KiDS-TEST-LARGE-GAL.HumVI.tar]] | [[http://www.astro.rug.nl/~verdoes/temp/KiDS-TEST-LARGE-GAL/cutouts.html | cutouts.html]] | test set using z<0.4 LRG selection to obtain angularly larger galaxies.|
|KiDS-TEST-QSO| [[https://astrodrive.astro.rug.nl/public.php?service=files&t=8a20ae781a9e8268fa20881cab7c841d | KiDS-TEST-QSO.tar]] | [[http://www.astro.rug.nl/~buddel/research/stronglenses/may2014meeting_HumVI/KiDS-TEST-QSO.HumVI.tar|KiDS-TEST-QSO.HumVI.tar]] | [[http://www.astro.rug.nl/~verdoes/temp/KiDS-TEST-QSO/cutouts.html | cutouts.html]] | Photometrically selected QSOs |
|KiDS-TEST-RANDOM| [[https://astrodrive.astro.rug.nl/public.php?service=files&t=f111bf815497b2669da1606688c89ba4| KiDS-TEST-RANDOM.tar]] | [[http://www.astro.rug.nl/~buddel/research/stronglenses/may2014meeting_HumVI/KiDS-TEST-RANDOM.HumVI.tar|KiDS-TEST-RANDOM.HumVI.tar]] | [[http://www.astro.rug.nl/~verdoes/temp/KiDS-TEST-RANDOM/cutouts.html | cutouts.html]] | Random locations around HIGHZ-LRG candidates.|
|KiDS-BLUEPAIRS | [[http://www.astro.rug.nl/~buddel/research/stronglenses/may2014meeting_HumVI/KiDS-BLUEPAIRS.tar|KiDS-BLUEPAIRS.tar]] | in KiDS-BLUEPAIRS.tar | | Blue Pairs |
|KiDS-PSF | [[https://www.dropbox.com/s/cal7t0tz2hciem7/PSF_KiDS.tar | PSF_KiDS.tar]] | | | FITS images of (hopefully representative) KiDS PSF models (based on shapelets) |

== General description datapacks 

Each datapack contains:
* README.txt (general summary information)
* <datapackname>.pdf (more detailed information)
* per source cut-outs of coadd images and of associated weight images in the 4 KiDS filters u, g, r and i. 
   * size 100pix x 100pix = 20" x 20" 
* naming convention: <KiDS_tilename>__<radecOfSource>__<filtername>__<SLID__SIDofSourceList><r if random>__<size>.fits/weight.fits
   * SLID, SID are SourceList and Source IDentifiers in Astro-WISE system.
   * character r is appended if it are random cut-outs instead of centered on candidate sources
   * size is in pixel units (0.2"/pix)
* Units coadd images: mag=-2.5*log10(pixelvalue)
* units weight images: inverse variance images using same unit convention as coadd images (only background noise!).
* png thumbnails and cutouts.html (for browser view on cutouts)
* may2014meeting.py: python code used to generate datapack from Astro-WISE python prompt.

Content to be added next: 
* color images

== KiDS-LOWZ-LRG datapack description

We have prepared a set of 5322 LRG candidates. Selection is aimed to get z<~0.4 luminous red galaxies. They are selected photometrically in 69 KiDS tiles (each approx. 1sq.deg.) The photometric selection is based on the [[http://www.sdss3.org/dr9/algorithms/boss_galaxy_ts.php | BOSS LOWZ selection]], adapted to KiDS:

   * |c_perp| < 0.2
   * r < 13.5 + c_par/0.3
   * 16 < r < 19.6
   * SGCLASS_r==2 (means extended object in r)

where magnitudes are in 10 and 2 arcsec diameter apertures and we have used the following auxiliary colors:

   * cpar = 0.7(g - r) + 1.2[(r - i) - 0.18)]
   * cperp = (r - i) - (g - r)/4.0 - 0.18



<box 100%>
{{:projects:kids:lensing:stronglensing:mag_flux_radius.png?500|}}

Aperture magnitude vs radius containing 50% of the light for example set. 
</box>

== KiDS-HIGHZ-LRG datapack description

We have prepared a set of 7409 LRG candidates. They are selected photometrically in 80 KiDS tiles (each approx. 1sq.deg.)
The photometric selection is based on the [[http://www.sdss3.org/dr9/algorithms/boss_galaxy_ts.php | BOSS CMASS selection]], adapted to KiDS:
   * dperp > 0.55 (with dperp = (r-i) - (g-r)/8.0, and all magnitudes in 2arcsec apertures)
   * i < 19.86+ 1.6(dperp - 0.8)
   * 17.5 < i < 19.9
   * r - i < 2
   * SGCLASS_r==2 (means extended object in r)

== KiDS-TEST-QSO datapack description

We have prepared a testset of 5557 QSO candidates. Selection is aimed to get 0.5<z<2 QSOs. They are selected photometrically in 37 KiDS tiles (each approx. 1sq.deg.) The photometric selection is:

   * SGCLASS_r==1 (means point source in r)
   * 0.0<u-i<1.0
   * r<22.0

where magnitudes are in 2 arcsec diameter apertures.

== KiDS-TEST datapack description

We have prepared a testset for 564 LRG candidates. They are selected photometrically in 5 KiDS tiles (each approx. 1sq.deg.)
The photometric selection is same as HIGHZ-LRG datpack (see above).

== KiDS-TEST-LARGE-GAL datapack description

We have prepared a testset for 810 LRG candidates. Selection is same as KiDS-LOWZ-LRG (see above)

== KiDS-TEST-RANDOM datapack description

We have prepared a testset for 472 "random" KiDS locations. These are cut-outs centered on points uniformly selected in a square box of 1arcmin size around HIGHZ-LRG candidate locations in 5 KiDS tiles.


== KiDS-PSF datapack description

Konrad Kuijken has modeled the PSFs in u, g, r and i for one KiDS tile. Each at 5 locations in the FoV. Model is based on shapelet analysis. Hopefully they are representative enough in this early phase to test lens-finding tools on KiDS data. 
See release note at [[projects:kids:data_deliveries:kids-eso-dr1:releasenotes|KiDS-ESO-DR1 Consortium Portal]] for a typical distribution of seeing in KiDS data.

== Input KiDS area

We can use 173 tiles (~173 sq.deg.) in the KiDS area that have completed coverage (i.e., u,g,r and i). This set is called KiDS-INT-DR3.
* [[http://home.strw.leidenuniv.nl/~irisarri/DR3/SynopticTable/index.php | KiDS-INT-DR3 synoptic table]]
* [[XX | coming soon: KiDS-INT-DR3 four-band catalogs]]
* [[projects:kids:data_deliveries:kids-int-dr3:releasenotes|KiDS-INT-DR3 Consortium Portal]] for more details


* **AI: JdJ/GVK**: 140319: one coadd missing, KiDS-INT-DR3 sourcelists missing.

== Handy links / references

* [[https://docs.google.com/document/d/1lmMbYoByu1DgrxaoAJlC-3rif-PAH3qyjMdoyKLeAWs/edit | KiDSLensFinding]] shared GoogleDoc
* [[http://euclid.roe.ac.uk/projects/slswg/wiki | Euclid SLWG wiki]] on redmine
* [[http://euclid.roe.ac.uk/projects/slswg/wiki/May_1-2_2014_Groningen_The_Netherlands | 1-2 May meeting Groningen]] page
* [[projects:kids:kidsviking:combinedcatalogs|KiDS+VIKING Combined Catalogs]]
* [[http://www.astro-wise.org/viewvc/awe/astro/experimental/stronglenses/may2014meeting.py?view=markup | may2014meeting.py]] Astro-WISE python script to make datapacks