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arXiv 1612.06296astro-ph.COastro-ph.GA
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宇宙background radiation上Sunyaev-Zel'dovich印记对AGN反馈的限制

Constraints on AGN feedback from its Sunyaev-Zel'dovich imprint on the cosmic background radiation

Bjoern Soergel, Tommaso Giannantonio, George Efstathiou, Ewald Puchwein, Debora Sijacki

摘要:

我们通过对活动星系核(AGN)在宇宙微波背景(CMB)上的热Sunyaev-Zel'dovich(SZ)印记设定限制,推导出活动星系核(AGN)反馈的约束条件。任何SZ签名的振幅都很小,并退化与AGN宿主星系和其他未解决的尘埃源沿视线的亚毫米光谱能量分布知之甚少。在这里,我们打破这种简并相结合的微波和亚毫米数据从普朗克与全天空远红外地图从AKARI卫星。我们首先测试我们的测量管道使用斯隆数字巡天(SDSS)redMapper星系团目录,发现一个非常显着的检测($>$ $20σ$)的SZ效应以及相关的尘埃排放。然后,我们对SDSS数据发布7(DR 7)和重子振荡光谱巡天(BOSS)DR 12中与光谱确认的准恒星物体(QSO)相关的SZ信号进行了约束。我们得到一个低显着性($1.6σ$)提示SZ信号,指向平均热能$\simeq 5 \times 10^{60}$尔格,低于在一些以前的研究报告。我们的结果与高分辨率的流体动力学模拟,包括活动星系核反馈的比较表明类星体主机质量的$M_{200c} \sim 4 \times 10^{12}~h^{-1}M_\odot$,但有很大的不确定性。我们的分析没有提供决定性的证据,SZ信号特别与活动星系核反馈。

英文摘要:

We derive constraints on feedback by active galactic nuclei (AGN) by setting limits on their thermal Sunyaev-Zel'dovich (SZ) imprint on the cosmic microwave background (CMB). The amplitude of any SZ signature is small and degenerate with the poorly known sub-mm spectral energy distribution of the AGN host galaxy and other unresolved dusty sources along the line of sight. Here we break this degeneracy by combining microwave and sub-mm data from Planck with all-sky far-infrared maps from the AKARI satellite. We first test our measurement pipeline using the Sloan Digital Sky Survey (SDSS) redMaPPer catalogue of galaxy clusters, finding a highly significant detection ($>$$20σ$) of the SZ effect together with correlated dust emission. We then constrain the SZ signal associated with spectroscopically confirmed quasi-stellar objects (QSOs) from SDSS data release 7 (DR7) and the Baryon Oscillation Spectroscopic Survey (BOSS) DR12. We obtain a low-significance ($1.6σ$) hint of an SZ signal, pointing towards a mean thermal energy of $\simeq 5 \times 10^{60}$ erg, lower than reported in some previous studies. A comparison of our results with high-resolution hydrodynamical simulations including AGN feedback suggests QSO host masses of $M_{200c} \sim 4 \times 10^{12}~h^{-1}M_\odot$, but with a large uncertainty. Our analysis provides no conclusive evidence for an SZ signal specifically associated with AGN feedback.

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