R. Bielby, P. Hudelot, H. J. McCracken, O. Ilbert, E. Daddi, O. Le Fèvre, V. Gonzalez-Perez, J. -P. Kneib, C. Marmo, Y. Mellier, M. Salvato, D. B. Sanders, C. J. Willott
We present a new near-infrared imaging survey in the four CFHTLS deep fields:
the WIRCam Deep Survey or "WIRDS". WIRDS comprises extremely deep, high quality
(FWHM \approx 0.6") J, H and Ks imaging covering a total effective area of 2.1
square degrees and reaching AB 50% completeness limits of \approx 24.5. We
combine our images with the CFHTLS to create a unique eight-band ugrizJHKS
photometric catalogues in the four CFHTLS deep fields; these four separate
fields allow us to make a robust estimate of the effect of cosmic variance for
all our measurements. We use these catalogues in combination with \approx 9,800
spectroscopic redshifts to estimate precise photometric redshifts ({\sigma} <
0.03), galaxy types, star-formation rates and stellar masses for a unique
sample of \approx 1.8 million galaxies. Our JHKs number counts are consistent
with previous studies. We apply the "BzK" selection to our gzK filter set and
find that the star forming BzK selection successfully selects 76% of
star-forming galaxies in the redshift range 1.4 < z < 2.5 in our photometric
catalogue, based on our photometric redshift measurement. Similarly the passive
BzK selection returns 52% of the passive 1.4 < z < 2.5 population identified in
the photometric catalogue. We present the mass functions of the total galaxy
population as a function of redshift up to z = 2. We show that the GALFORM
semi-analytical galaxy formation model can produce a consistent match to the
observed mass functions across the mass range log(M/M\odot) \sim 10-11 up to
redshifts of z \sim 1.2 - 1.5. All photometric catalogues and images are made
publicly available from TERAPIX and CADC.
View original:
http://arxiv.org/abs/1111.6997
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