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CFHTLenS: Improving the quality of photometric redshifts with precision photometry
H. Hildebrandt, T. Erben, K. Kuijken +16
Here we present the results of various approaches to measure accurate colours and photometric redshifts (photo-z's) from wide-field imaging data. We use data from the Canada-France…
Magnification by Galaxy Group Dark Matter Halos
Jes Ford, Hendrik Hildebrandt, Ludovic Van Waerbeke +6
We report on the detection of gravitational lensing magnification by a population of galaxy groups, at a significance level of 4.9 sigma. Using X-ray selected groups in the COSMOS…
Lensing Magnification: A novel method to weigh high-redshift clusters and its application to SpARCS
Hendrik Hildebrandt, Adam Muzzin, Thomas Erben +6
We introduce a novel method to measure the masses of galaxy clusters at high redshift selected from optical and IR Spitzer data via the red-sequence technique. Lyman-break galaxies…
Tracing the Star Formation-Density Relation to z~2
Ryan F. Quadri, Rik J. Williams, Marijn Franx +1
Recent work has shown that the star formation-density relation -- in which galaxies with low star formation rates are preferentially found in dense environments -- is still in plac…
Mass, Light and Colour of the Cosmic Web in the Supercluster SCL2243-0935 (z=0.447)
Mischa Schirmer, Hendrik Hildebrandt, Konrad Kuijken +1
Context: In 2.2m MPG-ESO/WFI data we discovered several mass peaks through weak lensing, forming a possible supercluster at redshift 0.45. Through multi-colour wide-field imaging w…