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We present and compare in this paper new photometric redshift catalogs of the galaxies in three public fields: the NTT Deep Field, the HDF–N and the HDF–S. In the case of the NTT Deep Field, we present here a new photometric catalog, obtained by combining the existing BVrI and JKs with new deep U observations acquired with NTT-SUSI2, and which includes also(More)
Context. Photometric redshifts (photo-z's) have become an essential tool in extragalactic astronomy. Many current and upcoming observing programmes require great accuracy of photo-z's to reach their scientific goals. Aims. Here we introduce PHAT, the PHoto-z Accuracy Testing programme, an international initiative to test and compare different methods of(More)
Observations of distant supernovae indicate that the Universe is now in a phase of accelerated expansion the physical cause of which is a mystery. Formally, this requires the inclusion of a term acting as a negative pressure in the equations of cosmic expansion, accounting for about 75 per cent of the total energy density in the Universe. The simplest(More)
To understand the evolution of galaxies, we need to know as accurately as possible how many galaxies were present in the Universe at different epochs. Galaxies in the young Universe have hitherto mainly been identified using their expected optical colours, but this leaves open the possibility that a significant population remains undetected because their(More)
We present accurate photometric redshifts in the 2-deg 2 COSMOS field. The redshifts are computed with 30 broad, intermediate, and narrow bands covering the UV (GALEX), Visible-NIR (Subaru, CFHT, UKIRT and NOAO) and mid-IR (Spitzer/IRAC). A χ 2 template-fitting method (Le Phare) was used and calibrated with large spectroscopic samples from VLT-VIMOS and(More)
We follow the galaxy stellar mass assembly by morphological and spectral type in the COSMOS 2-deg 2 field. We derive the stellar mass functions and stellar mass densities from z = 2 to z = 0.2 using 192,000 galaxies selected at F 3.6µm > 1µJy with accurate photometric redshifts (σ (z phot −zspec)/(1+zspec) ∼ 0.012). Using a spectral classification, we find(More)
Context. Future dark energy space missions such as JDEM and EUCLID are being designed to survey the galaxy population to trace the geometry of the universe and the growth of structure, which both depend on the cosmological model. To reach the goal of high precision cosmology they need to evaluate the capabilities of different instrument designs based on(More)
We analyze the clustering properties of ultraviolet selected galaxies by using GALEX-SDSS data at z < 0.6 and CFHTLS deep u ′ imaging at z ∼ 1. These datasets provide a unique basis at z ≤ 1 which can be directly compared with high redshift samples built with similar selection criteria. We discuss the dependence of the correlation function parameters (r 0 ,(More)
We present the first statistical analysis of the complete ESO-Sculptor Survey (ESS) of faint galaxies. The flux-calibrated sample of 617 galaxies with Rc ≤ 20.5 is separated into 3 spectral classes, based on a principal component analysis which provides a continuous and template-independent spectral classification. We use an original method to estimate(More)