منابع مشابه
Cosmology with void-galaxy correlations.
Galaxy bias, the unknown relationship between the clustering of galaxies and the underlying dark matter density field is a major hurdle for cosmological inference from large-scale structure. While traditional analyses focus on the absolute clustering amplitude of high-density regions mapped out by galaxy surveys, we propose a relative measurement that compares those to the underdense regions, c...
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Bolometer arrays on large antennas at high, dry sites have unveiled a dusty population of massive, luminous galaxies – submillimetre galaxies, or SMGs – which make a significant contribution to the star-formation rate density at z > 1. The most crucial piece of information required to derive the history of obscured star formation is the redshift distribution of this galaxy population, N(z), whi...
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Motivated by recent suggestions that a number of observed galaxy clusters have masses which are too high for their given redshift to occur naturally in a standard model cosmology, we use extreme value statistics to construct confidence regions in the mass–redshift plane for the most extreme objects expected in the universe. We show how such a diagram not only provides a way of potentially rulin...
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Aims. Power-law cosmologies, in which the cosmological scale factor evolves as a power law in the age, a ∝ t with α >∼ 1, regardless of the matter content or cosmological epoch, is comfortably concordant with a host of cosmological observations. Methods. In this article, we use recent measurements of the X-ray gas mass fractions in clusters of galaxies to constrain the α parameter with curvatur...
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ژورنال
عنوان ژورنال: General Relativity and Gravitation
سال: 2007
ISSN: 0001-7701,1572-9532
DOI: 10.1007/s10714-007-0546-8