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arXiv 1902.01768astro-ph.GA
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关于星系团的广义Faber-Jackson关系

On the generalized Faber-Jackson relation for galaxy clusters

Carlos E. Navia

摘要:

观测值与基于自相似标度模型的星系团的期望值之间的显著偏差,特别是在红移达到$z\lesssim 0.4$时,限制了X射线星系团标度关系随红移的演化,认为在此红移范围内,观测数据受选择偏差的影响很大。然而,也表明,一些非引力过程可以负责一个弱的或几乎为零的演变,至少对$z\lesssim 0.4$。如果我们假设X射线的发射是由温度约为$10^8$ K的热扩散星系团内气体的热韧致辐射引起的,那么在X射线星系团中观察到的这种几乎普遍性就可以理解了。其中一小部分不会被束缚在星团中,而是会随风逃逸。这种热风可以温暖当地的环境,热浴,其中集群浸泡。这种机制可以将所有的星系团置于热浴中,具有几乎相同的有效温度,与星系团的红移无关,并且它可以有效地用于红移高达$z\sim 0.4$的星系团。Debye引力理论(DGT)允许获得广义Faber-Jackson关系来描述星系团,如M- $σ$和M-Tx关系作为浴热温度的函数。我们表明,DGT预测的$σ$关系,重叠的数据上的一个广泛的光谱调查的星系团与MMT/Hectospec,在0.1 $\leq$ z $\leq$ 0.3。DGT对M-Tx关系的预测与加拿大、法国、夏威夷望远镜透镜巡天和XMM-CFHTLS巡天直到$z\sim 0.47$的数据拟合几乎重叠。

英文摘要:

The significant deviations among observations and the expectations based on self-similar scaling model of galaxy clusters, especially up to redshift $z\lesssim 0.4$, constrain the evolution of the X-ray clusters scaling relations with the redshift, is claimed that in this redshift range, the data has a strong influence by selection bias. However, also suggests that some non-gravitational processes can be responsible for a weak or almost null evolution, at least to $z\lesssim 0.4$. This almost universality observed in X-ray galaxy clusters can be understood if we assume that the X-ray emission, results from thermal bremsstrahlung from a hot diffuse intracluster gas with temperatures about $10^8$ K. A fraction of it would not be bound to the cluster and would escape as a wind. This hot wind can warm the local environment, the thermal bath where the cluster is immersed. This mechanism can put all the galaxy clusters within thermal baths, with almost the same effective temperature, independent of the cluster redshift and it can be effective for clusters with redshifts up to $z\sim 0.4$. Debye Gravitational Theory (DGT), allows obtaining a Generalized Faber-Jackson relation to described the galaxy clusters such as the M-$σ$ and M-Tx relations as a function of the bath thermal temperature. We show that the DGT prediction to the M-$σ$ relation, overlap the fit on data of an extensive spectroscopic survey of galaxy clusters with MMT/Hectospec, at 0.1$\leq$ z $\leq$ 0.3. And the DGT predictions to the M-Tx relation almost overlap the fit on data from Canada France Hawaii Telescope Lensing Survey and XMM-CFHTLS surveys up to $z\sim 0.47$.

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