论文标题
反馈 /冷却平衡的红移演变48 SPT Galaxy簇的核心:一个联合$ \ boldsymbol {chandra} $ - SPT-ATCA分析
Redshift Evolution of the Feedback / Cooling Equilibrium in the Core of 48 SPT Galaxy Clusters: A Joint $\boldsymbol{Chandra}$-SPT-ATCA analysis
论文作者
论文摘要
我们分析了从南极望远镜(SPT)目录中选择的48个星系簇的冷却和反馈特性,例如0.4 <z <z <1.3 $,如$ z {\ sim} 0 $的大规模且研究良好系统的祖细胞的进化。我们从澳大利亚望远镜紧凑型阵列(ATCA)数据的分析中估算每个群集最明亮的集群星系(BCG)位置的无线电功率。假设无线电功率与主动银河核(AGN)腔功率之间的缩放关系$ p _ {\ mathrm {cav}} $在低红移下观察到的不会随红移而演变,我们使用这些测量值来估算每个系统核心中预期的AGN腔。我们通过对可用$ chandra $ x射线和spt sunyaev-zel'dovich(sz)数据的联合分析来估计每个集群的冷却半径$ l _ {\ mathrm {cool}} $中的X射线光度。这使我们能够表征$ p _ {\ mathrm {cav}} / l _ {\ mathrm {cool}} $比率的红移演变。当与低降距结果结合使用时,这些约束可以研究群集生长的9〜GYR的反馈/冷却周期的性质。我们通过对数正态分布$ \ Mathrm {log} $ - $ \ MATHCAL {N}(α+βz,σ^2)$对酷核簇测得的该比率的红移演变进行建模,并约束平均演化$β= -0.0.05 \ pm pm 0.47 $的平均进化范围。该分析将这种关系斜率的限制提高了两个因素。我们没有发现在这些簇中反馈/冷却平衡的红移演变的证据,这表明无线电模式反馈的发作是在群集形成的早期阶段进行的。 $ p _ {\ Mathrm {cav}} / l _ {\ Mathrm {cool}} $的高值是在非高校核心群集的BCG位置上找到的,这可能表明AGN反馈周期的时间表和酷核心核心核心核心核心过渡是不同的。
We analyze the cooling and feedback properties of 48 galaxy clusters at redshifts $0.4 < z < 1.3$ selected from the South Pole Telescope (SPT) catalogs to evolve like the progenitors of massive and well-studied systems at $z{\sim}0$. We estimate the radio power at the brightest cluster galaxy (BCG) location of each cluster from an analysis of Australia Telescope Compact Array (ATCA) data. Assuming that the scaling relation between radio power and active galactic nucleus (AGN) cavity power $P_{\mathrm{cav}}$ observed at low redshift does not evolve with redshift, we use these measurements in order to estimate the expected AGN cavity power in the core of each system. We estimate the X-ray luminosity within the cooling radius $L_{\mathrm{cool}}$ of each cluster from a joint analysis of the available $Chandra$ X-ray and SPT Sunyaev-Zel'dovich (SZ) data. This allows us to characterize the redshift evolution of the $P_{\mathrm{cav}} / L_{\mathrm{cool}}$ ratio. When combined with low-redshift results, these constraints enable investigations of the properties of the feedback/cooling cycle across 9~Gyr of cluster growth. We model the redshift evolution of this ratio measured for cool core clusters by a log-normal distribution $\mathrm{Log}$-$\mathcal{N}(α+ βz, σ^2)$ and constrain the slope of the mean evolution $β= -0.05\pm 0.47$. This analysis improves the constraints on the slope of this relation by a factor of two. We find no evidence of redshift evolution of the feedback/cooling equilibrium in these clusters which suggests that the onset of radio-mode feedback took place at an early stage of cluster formation. High values of $P_{\mathrm{cav}} / L_{\mathrm{cool}}$ are found at the BCG location of non-cool core clusters which might suggest that the timescales of the AGN feedback cycle and the cool core / non-cool core transition are different.