CARS: the CFHTLS-Archive-Research Survey; I. Five-band multi-colour data from 37 sq. deg. CFHTLS-Wide observations - AstrophysicsReportar como inadecuado




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Abstract: We present the CFHTLS-Archive-Research Survey CARS. It is a virtualmulti-colour survey based on public archive images from the CFHT-Legacy-Survey.Our main scientific interests in CARS are optical searches for galaxy clustersfrom low to high redshift and their subsequent study with photometric andweak-gravitational lensing techniques. As a first step of the project wepresent multi-colour catalogues from 37 sq. degrees of the CFHTLS-Widecomponent. Our aims are to create astrometrically and photometrically wellcalibrated co-added images. Second goal are five-band u*, g-, r-, i-, z-multi-band catalogues with an emphasis on reliable estimates for objectcolours. These are subsequently used for photometric redshift estimates. Thearticle explains in detail data processing, multi-colour catalogue creation andphotometric redshift estimation. Furthermore we apply a novel technique, basedon studies of the angular galaxy cross-correlation function, to quantify thereliability of photo-z-s. The accuracy of our high-confidence photo-z sample10-15 galaxies per sq. arcmin is estimated to $\sigma {\Delta z-1+z}\approx0.04-0.05$ up to i-<24 with typically only 1-3% outliers. Interested users canobtain access to our data by request to the authors.



Autor: T. Erben, H. Hildebrandt, M. Lerchster, P. Hudelot, J. Benjamin, L. van Waerbeke, T. Schrabback, F. Brimioulle, O. Cordes, J. P.

Fuente: https://arxiv.org/







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