Fabrizia Poli

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We present the redshift distribution of a complete sample of 480 galaxies with Ks < 20 distributed over two independent fields covering a total area of 52 arcmin 2. The redshift completeness is 87% and 98% respectively with spectroscopic and high-quality and tested photometric redshifts. The redshift distribution of field galaxies has a median redshift z(More)
We use a deep K AB ≤ 25 galaxy sample in the Hubble Deep Field South to trace the evolution of the cosmological stellar mass density from z ≃ 0.5 to z ≃ 3. We find clear evidence for a decrease of the average stellar mass density at high redshift, 2 ≤ z ≤ 3.2, that is 15 +25 −5 % of the local value, two times higher than what observed in the Hubble Deep(More)
We present near-IR (J and Ks) number counts and colors of galaxies detected in deep VLT-ISAAC images centered on the Chandra Deep Field and Hubble Deep Field-South for a total area of 13.6 arcmin 2. The limiting surface brightness obtained is Ks22.8 mag/arcsec 2 and J24.5 (1σ) on both fields. A dlogN/dm relation with a slope of ∼ 0.34 in J and ∼ 0.28 in Ks(More)
The K20 survey is an ESO VLT optical and near-infrared spectroscopic survey aimed at obtaining spectral information and redshifts of a complete sample of about 550 objects to Ks ≤ 20.0 over two independent fields with a total area of 52 arcmin 2. In this paper we discuss the scientific motivation of such a survey, we describe the photometric and(More)
To address the problem concerning the early formation of stars in massive galaxies, we present the results of a semi-analytic model of galaxy formation which includes a physical description of starbursts triggered by galaxy interactions. These originate from the destabilization of cold galactic gas occurring in galaxy encounters, which in part feeds the(More)
Description: Nuclear magnetic resonance (NMR) is an analytical tool used by chemists and physicists to study the structure and dynamics of molecules. In recent years, no other technique has gained such significance as NMR spectroscopy. It is used in all branches of science in which precise structural determination is required and in which the nature of(More)
A specific experimental apparatus consisting of an ion source and a detector for the investigation of the interaction between suprathermal ions and drift-wave turbulence is developed on the toroidal plasma experiment. Due to the low plasma temperature ͑ϳ5 eV͒, a spatially localized, small-size ion source ͑ϳ4 cm͒ mounted inside the vacuum vessel with(More)
We report on the observation of a large production of runaway electrons during a disruptive termination of discharges heated with lower-hybrid waves at the Frascati Tokamak Upgrade. The runaway current plateaus, which can carry up to 80% of the predisruptive current, are observed more often than in normal Ohmic disruptions. The largest runaway currents(More)
We develop a semi-analytic model of hierarchical galaxy formation with an improved treatment of the evolution of galaxies inside dark matter haloes. We take into account not only dynamical friction processes building up the central dominant galaxy, but also binary aggregations of satellite galaxies inside a common halo. These deplete small to intermediate(More)
Progress in understanding turbulence and related cross-field transport of fusion relevance is achieved in the simple magnetized plasmas of the TORPEX toroidal device, which provides an ideal test bed for code benchmarking and theory validation. In TORPEX (R = 1 m, a = 0.2 m), a small vertical magnetic field B z < 4 mT is superposed on a toroidal magnetic(More)
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