BRANCHINI E

We introduce a simple linear equation relating the line-of-sight peculiar-velocity and density contrast correlation functions. The relation, which we call the Gaussian cell two-point `energy-like' equation, is valid at the distant-observer limit and requires Gaussian smoothed fields. In the variance case, i.e. at zero lag, the equation is...

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We assess the extent to which the flux-limited IRAS PSCz redshift survey encapsulates the complete or major share of matter inhomogeneities responsible for the external tidal forces affecting the peculiar velocity flow within the Local Supercluster and its immediate surroundings. We here investigate this issue on the basis of artificially...

Analytical calculations and recent numerical experiments have shown that a sizable amount of the mass of our Galaxy is in a form of clumpy, virialized substructures that, according to Diemand et al., can be as light as 10-6Msun. In this work we estimate the gamma-ray flux expected from dark matter annihilation occurring within these minihalos,...

Using a dynamical three-dimensional reconstruction procedure, we estimate the peculiar velocities of R greater than or equal to 0 Abell/ACO galaxy clusters from their measured redshift within 25,000 km s(-1). The reconstruction algorithm relies on the linear gravitational instability hypothesis, assumes linear biasing, and requires an input...

We consider simple semi-analytic models that relate the active galactic nuclei (AGNs) evolution to the merging history of their host dark matter haloes and quantify their ability of matching the AGN luminosity function (LF) and its spatial clustering at low and intermediate redshifts. In particular, we focus on the recent determinations of the...

We investigate the ability of hierarchical models of quasi-stellar object (QSO) formation and evolution to match the observed luminosity, number counts and spatial clustering of quasars at redshift z < 2. These models assume that the QSO emission is triggered by galaxy mergers, that the mass of the central black hole (BH) correlates with halo...