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The Kilo-Degree Survey

The Kilo-Degree Survey. Konrad Kuijken Leiden Observatory. LSST. CFHT-W. UKIDSS. DUNE. SDSS. DES. PS4. PS1. VIKING. CFHT-D. KiDS. Survey parameters. Area covered Median redshift Image quality Wavelength coverage. U   K. z med.

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The Kilo-Degree Survey

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  1. The Kilo-Degree Survey Konrad Kuijken Leiden Observatory

  2. LSST CFHT-W UKIDSS DUNE SDSS DES PS4 PS1 VIKING CFHT-D KiDS Survey parameters • Area covered • Median redshift • Image quality • Wavelength coverage U  K zmed 0.2 0.8 1.0 4 200 1500 5000 9000 20000 area

  3. Science Objectives • Dark matter distribution through weak lensing • Collateral damage: • Galaxy evolution as related to environment • Cluster counts/samples • Stellar halo • Faint end of stellar Lum.Fn. • High-z qso’s

  4. Dark matter / weak lensing • Mass concentrations along line of sight deflect light rays. Gradient  distortion  correlated ellipticities • Probe of • Galaxy halos: mass, extent, shape • Large scale structure mass power spectrum • As function of source redshift: • Growth history  H(z)

  5. Cosmology with lensing • Structure growth rate depends on expansion history of universe • Measure both  test of GR • Space missions (JDEM, EDEM) • Ground-based surveys pave the way

  6. Shears Good image quality Service mode, autofocus Well-behaved PSF VST design Good astrometry High-fidelity ellipticities STEP project KSB, shapelets, lensfit? Redshifts Photo-z’s, many bands KiDS + VIKING Photometric calibration Calibration plan Overlap with SDSS, S.SkyMapper extinction High-fidelity photo-z’s PSF-matched aperture phot. PHAT project Spectroscopic calibration Technical requirements

  7. Extinction • N: equator •  10 - 15:50h •  -5 - +4o • 14 sq.deg in W2 • S: SGP area •  22 - 3:30h •  -25 - -35o

  8. Other data • Spectroscopy • 2dF, SDSS, GAMA • UKIDSS • VIKING (VISTA) YZJHK • Herschel • Spitzer post-cryo

  9. 60 b=45 30 -75 b=-60 SDSS + UKIDSS 2dF 1500 sq.deg. in ugriZYJHK +2000 sq.deg. in i (+UKIDSS YJHK) 2dF

  10. GAMA • Redshift survey to r=19.8 • 2,000 gals/sq.deg. • 140 sq.deg. Total • AA 2008-2010 • Add to 2dF and SDSS spectra in hand ! March: 15 nights, 35000 redshifts!

  11. H1K • Herschel Key programme • 550 sq.deg. awarded: 250 in KiDS-S, 150 in KiDS-N

  12. KiDS & AstroWISE • Environment for advanced pipelines • db of primary data • Science exposures • Calibration • db of secondary data: • Extinction map • IR image surveys • Spectroscopic surveys

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