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Testing power-law cosmology with galaxy clusters

Zhu, Zong-Hong ; Hu, M. ; Alcaniz, J. S. ; Liu, Y.-X.

Astronomy and astrophysics (Berlin), 2008-05, Vol.483 (1), p.15-18 [Periódico revisado por pares]

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Título:
Testing power-law cosmology with galaxy clusters
Autor: Zhu, Zong-Hong ; Hu, M. ; Alcaniz, J. S. ; Liu, Y.-X.
Assuntos: Astronomy ; cosmological parameters ; cosmology: theory ; Earth, ocean, space ; Exact sciences and technology ; X-rays: galaxies: clusters
É parte de: Astronomy and astrophysics (Berlin), 2008-05, Vol.483 (1), p.15-18
Notas: other:2008A%26A...483...15Z
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publisher-ID:aa7797-07
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ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
Descrição: Aims. Power-law cosmologies, in which the cosmological scale factor evolves as a power law in time, $a \propto t^{\alpha}$ with $\alpha \ga 1$, 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 curvature $k = \pm1, 0$. Results. We find that the best fit happens for an open scenario with the power index $\alpha = 1.14$ ± 0.05, though the flat and closed model cannot be ruled out with high confidence. Conclusions. Our results are in agreement with other recent analyses and show that the X-ray gas mass fraction measurements in clusters of galaxies provide a complementary test of the power-law cosmology.
Editor: Les Ulis: EDP Sciences
Idioma: Inglês

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