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19 papers · 1 filter
Stationary and static cylindrically symmetric Einstein spaces of the Lewis form
M. A. H. MacCallum, N. O. Santos
The derivation of the general solutions for stationary and static cylindrically symmetric Einstein spaces of Lewis form is revisited and the physical and geometrical meaning of the…
An exterior for the Gödel spacetime
W. B. Bonnor, N. O. Santos, M. A. H. MacCallum
We match the vacuum, stationary, cylindrically symmetric solution of Einstein's field equations with , in a form recently given by Santos, as an exterior to an infinite cylinder…
On the role of density inhomogeneity and local anisotropy in the fate of spherical collapse
L. Herrera, A. Di Prisco, J. L. Hernandez-Pastora +1
We obtain an expression for the active gravitational mass of a collapsing fluid distribution, which brings out the role of density inhomogeneity and local anisotropy in the fate of…
Study od a Slice at +9 to +15 degrees of Declination: I. The Neutral Hydrogen Content of Galaxies in Loose Groups
M. A. G. Maia, C. N. A. Willmer, L. N. da Costa
We examine the H1 content of spiral galaxies in groups by using a catalog of loose groups of galaxies identified in a magnitude limited sample m < 15.7 spanning the range 8 h to 18…
Morphology Transformation in Pairs of Galaxies - The Local Sample
Selma Junqueira, Duilia F. de Mello, Leopoldo Infante
We present photometric analysis of a local sample of 14 isolated pairs of galaxies. The photometric properties analyzed in the local pairs are: colors, morphology, tidal effects an…
The Nature of the Activity in Hickson Compact Groups of Galaxies
Roger Coziol, André L. B. Ribeiro, Reinaldo R. de Carvalho +1
We present the results of the spectral classification of the 82 brightest galaxies in a sample of 17 compact groups. We verify that the AGNs are preferentially located in the most…