Journal ArticleDOI
Conditions for the rapid growth of perturbations in an expanding universe.
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This article is published in The Astrophysical Journal.The article was published on 1972-01-01. It has received 11 citations till now. The article focuses on the topics: Big Rip & De Sitter universe.read more
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Journal ArticleDOI
Supermassive black-hole growth over cosmic time: Active galaxy demography, physics, and ecology from Chandra surveys
W. N. Brandt,David M. Alexander +1 more
TL;DR: Some of the exciting discoveries about AGN demography, physics, and ecology are highlighted, with a focus on results from Chandra.
Book ChapterDOI
Measuring Stars with High Angular Resolution: Current Status and Future Prospects
TL;DR: In this article, the current state of knowledge of angular diameters of stars is reviewed and, based on this review and the requirements for the determination of surface fluxes, effective temperatures, radii and masses, targets of sensitivity, angular resolution and accuracy for future programs of stellar angular diameter measurements are established.
Journal ArticleDOI
An investigation of the close environment of β Cephei with the VEGA/CHARA interferometer
Nicolas Nardetto,Denis Mourard,I. Tallon-Bosc,Michel Tallon,Philippe Berio,E. Chapellier,D. Bonneau,Olivier Chesneau,P. Mathias,Karine Perraut,Philippe Stee,A. Blazit,Jean-Michel Clausse,O. Delaa,A. Marcotto,Florentin Millour,A. Roussel,Alain Spang,H. A. McAlister,T. ten Brummelaar,J. Sturmann,L. Sturmann,Neal J. Turner,Chris Farrington,P. J. Goldfinger +24 more
TL;DR: In this article, the angular diameter of the star β Cep was determined by using the visible recombiner VEGA installed on the CHARA long-baseline interferometer at Mt. Wilson.
Journal ArticleDOI
Magnetohydrodynamic perturbations of Robertson-Walker universes and of anisotropic Bianchi type-I universes
A. J. Fennelly,C. R. Evans +1 more
TL;DR: In this paper, magnetohydrodynamic (MHD) perturbations in flat Robertson-Walker universes, emphasizing their effects on galaxy formation, were analyzed and the Newtonian approximation was used.
Journal ArticleDOI
The Rate of Growth of Density Perturbations in Simple Big-Bang Model Universes
D. Edwards,D. Heath +1 more
TL;DR: In this paper, exact solutions to the density perturbation equation derived by Bonnor were presented for the cases where Λ = Λ ≥ 0,k ≥ 1 and Λ ≤ −Λ ≥ 1.