论文标题
关于星系集群的可能宇宙演化
On a possible cosmological evolution of galaxy cluster $Y_{\rm X}-Y_{\rm SZE}$ scaling relation
论文作者
论文摘要
描述星系群集形成过程的自相似模型的重要结果是简单的缩放关系$ y _ {\ rm sze} d _ {\ rm a}^{2} {2}/c _ {\ rm xsze} y _ _ {\ rm x} = c $。以这个比例，$ y _ {\ rm sze} $是集群的Sunyaev-Zel'dovich效应通量，其X射线对应物为$ y _ {\ rm x} $，$ c _ {\ c _ {\ rm xsze} $和$ c $ c $是常见的and and anctant and and and and a} clant and a}。在本文中，我们将宇宙距离双重性关系有效共同考虑与IA类超新星的观测以及$ 61 $ $ $ y _ _ _ {\ rm sze} d _ {\ rm a}^{2}^{2}/c _ {\ rm xsze} y _ _ _ _ {考虑到红移范围（$ z <0.5 $）。没有使用一个特定的宇宙学模型。作为基本结果，尽管数据集与2 $σ$ c.l.之内的没有红移的演变兼容，但贝叶斯分析表明，这项工作中分析的其他$ c（z）$函数无法丢弃。值得强调的是，通用$ c（z）$函数的观察性确定使$ y _ {\ rm sze} d _ {{\ rm a}^{2} {2}/c _ {\ rm xsze} y _ {\ rm x} $ rm x} $以有用的宇宙学工具来确定合理学工具。
An important result from self-similar models that describe the process of galaxy cluster formation is the simple scaling relation $Y_{\rm SZE}D_{\rm A}^{2}/C_{\rm XSZE}Y_{\rm X}= C$. In this ratio, $Y_{\rm SZE}$ is the integrated Sunyaev-Zel'dovich effect flux of a cluster, its x-ray counterpart is $Y_{\rm X}$, $C_{\rm XSZE}$ and $C$ are constants and $D_{\rm A}$ is the angular diameter distance to the cluster. In this paper, we consider the cosmic distance duality relation validity jointly with type Ia supernovae observations plus $61$ $Y_{\rm SZE}D_{\rm A}^{2}/C_{\rm XSZE}Y_{\rm X}$ measurements as reported by the Planck Collaboration to explore if this relation is constant in the redshift range considered ($z<0.5$). No one specific cosmological model is used. As basic result, although the data sets are compatible with no redshift evolution within 2$σ$ c.l., a Bayesian analysis indicates that other $C(z)$ functions analyzed in this work cannot be discarded. It is worth to stress that the observational determination of an universal $C(z)$ function turns the $Y_{\rm SZE}D_{\rm A}^{2}/C_{\rm XSZE}Y_{\rm X}$ ratio in an useful cosmological tool to determine cosmological parameters.
