267 citations · 2.1k across the 89 of their papers we have counts for
14 papers · 1 filter
On Bode's law
R. Bass, A. Del Popolo
In a planetary or satellite system, idealized as n small bodies in initially coplanar, concentric orbits around a large central body, obeying Newtonian point-particle mechanics, re…
Numerical tests of dynamical friction in gravitational inhomogeneous systems
A. Del Popolo
In this paper, I test by numerical simulations the results of Del Popolo & Gambera (1998),dealing with the extension of Chandrasekhar and von Neumann's analysis of the statistics o…
Dynamical derivation of Bode's law
Robert W. Bass
In a planetary or satellite system, idealized as n small bodies in initially coplanar, concentric orbits around a large central body, obeying Newtonian point-particle mechanics, re…
The Effects of Shear and Rotation Anisotropy Upon the Process of Gravitational Instability
A. Del Popolo, E. N. Ercan, M. Gambera
In this paper, we study the role of shear fields on the evolution of density perturbations embedded in a Friedmann flat background universe, by studying the evolution of a homogene…
The mass and temperature functions in a moving barrier model
A. Del Popolo
In this paper, I use the extension of the excursion set model of Sheth & Tormen (2002) and the barrier shape obtained in Del Popolo & Gambera (1998) to calculate the unconditional…
A theoretical study of the mass temperature relation for clusters of galaxies
A. Del Popolo
I derive the mass-temperature relation and its time evolution for clusters of galaxies in different cosmologies by means of two different models. The first one is a modification an…
On the evolution of aspherical perturbations in the universe: an analytical model
A. Del Popolo
I study the role of shear fields by using an analytical approximate solution for the equations of motion of homogeneous ellipsoids embedded in a homogeneous background. The equatio…
Migration of giant planets in a time-dependent planetesimal accretion disc
A. Del Popolo, K. Y. Eksi
In this paper, we further develop the model for the migration of planets introduced in Del Popolo et al. (2001). We first model the protoplanetary nebula as a time-dependent accret…
Dynamical evolution of clusters of galaxies: the effect of high- velocity substructure clumps
A. Del Popolo, M. Gambera, E. N. Ercan
In the Cold Dark Matter (hereafter CDM) scenario even isolated density peaks contain a high fraction of small scale clumps having velocities larger than the average escape velocity…
Ellipsoidal collapse and previrialization
A. Del Popolo, N. E. Ercan, Z. Xia
We study the non-linear evolution of a dust ellipsoid,embedded in a Friedmann flat background universe, in order to determine the evolution of the density of the ellipsoid as the p…
The pair-wise velocity dispersion of galaxies: effects of non radial motions
A. Del Popolo
I discuss the effect of non-radial motions on the small-scale pairwise peculiar velocity dispersions of galaxies (PVD) in a CDM model. I calculate the PVD for the SCDM model by mea…
Migration of giant planets in planetesimal discs
A. Del Popolo, M. Gambera, E. Nihal Ercan
Planets orbiting a planetesimal circumstellar disc can migrate inward from their initial positions because of dynamical friction between planets and planetesimals. The migration ra…
Profiles of dark-matter haloes at high redshift
A. Del Popolo
I study the evolution of haloes density profiles as a function of time in the SCDM and LCDM cosmologies. Following Del Popolo et al. (1999), I calculate the concentration parameter…
The effect of non-radial motions on the X-ray temperature distribution function and the two-point correlation function of clusters
A. Del Popolo, M. Gambera
We show how non-radial motions, originating in the outskirts of clusters of galaxies, may reduce the discrepancy between the Cold Dark Matter (CDM) predicted X-ray temperature dist…