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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 a quasar candidate identification technique based on multicolor photometry. The traditional multi-dimensional method (2 × N dimensions, where N is the number of the color-color diagrams) is reduced to a one-dimensional technique, which consists in a standard fitting procedure, where the observed spectral energy distributions are compared to(More)
The evolution of optically selected quasars is usually supposed to be well described by a single constant evolution parameter, either k L or k D , depending whether we refer to luminosity or density evolution. In this paper we present a study of the variations of the V /V max and the evolution parameters with redshift, for different cosmological models, in(More)
We construct a physically motivated analytical model for the quasar luminosity function , based on the joint star formation and feeding of massive black holes suggested by the observed correlation between the black hole mass and the stellar mass of the hosting spheroids. The parallel growth of massive black holes and host galaxies is assumed to be triggered(More)
In this paper we present the optical and near-infrared identifications of the 1054 radio sources detected in the 20cm deep radio survey down to a 5σ flux limit of ∼80µJy obtained with the VLA in the VIMOS VLT Deep Survey VVDS-02h deep field. (50% completeness) we identified 718 radio sources (∼74% of the whole sample). The photometric redshift analysis(More)
A new method for measuring the shear induced by gravitational light deflection is proposed. It is based on analyzing the anisotropy induced in the auto-correlation function of the extragalactic background light which is produced by very faint distant galaxies. The auto-correlation function can be measured 'locally', and its anisotropy is caused by the tidal(More)
A new cosmological test is derived, based on the distribution of individual V /Vmax in a complete redshift– limited sample of distant objects. The fundamental assumption is that, in any range of absolute luminosity, individual V /Vmax are required to be uniformly spread over the [0, 1] range. Under the assumption of Pure Luminosity Evolution, this gives(More)