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arXiv 0910.4141astro-ph.CO
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星系团中气体质量分数对暗物质-暗能量相互作用的约束

Constraining dark matter-dark energy interaction with gas mass fraction in galaxy clusters

R. S. Goncalves, J. S. Alcaniz, A. Dev, D. Jain

摘要:

最近的观测证据表明,目前的宇宙加速激发了人们对替代宇宙学的新兴趣,例如在暗区(暗物质和暗能量)相互作用的场景。一般来说,这样的模型包含一个未知的负压暗分量,与无压的暗物质和/或重子耦合,导致宇宙的演化与标准$Λ$ CDM模型预测的宇宙演化截然不同。在这项工作中,我们使用最新的星系团气体质量分数与红移数据(42个X射线发光,动态弛豫的星系团,跨越红移范围0.063 < z < 1.063)(Allen et al. 2008)对表征暗物质/暗能量耦合的参数$ε$设置界限,以测试这种情况下的观测可行性。结果与其他宇宙学数据一致,并且通常具有约束力。虽然与时间无关的宇宙学常数($Λ$ CDM模型)与这些星系团数据很好地吻合,但仍不能排除相互作用的暗能量成分。

英文摘要:

The recent observational evidence for the current cosmic acceleration have stimulated renewed interest in alternative cosmologies, such as scenarios with interaction in the dark sector (dark matter and dark energy). In general, such models contain an unknown negative-pressure dark component coupled with the pressureless dark matter and/or with the baryons that results in an evolution for the Universe rather different from the one predicted by the standard $Λ$CDM model. In this work we test the observational viability of such scenarios by using the most recent galaxy cluster gas mass fraction versus redshift data (42 X-ray luminous, dynamically relaxed galaxy clusters spanning the redshift range 0.063 < z < 1.063) (Allen et al. 2008) to place bounds on the parameter $ε$ that characterizes the dark matter/dark energy coupling. The resulting are consistent with, and typically as constraining as, those derived from other cosmological data. Although a time-independent cosmological constant ($Λ$CDM model) is a good fit to these galaxy cluster data, an interacting dark energy component cannot yet be ruled out.

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