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arXiv 0709.0952astro-ph
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利用Sunyaev-Zel'dovich效应测量AGN反馈

Measuring AGN Feedback with the Sunyaev-Zel'dovich Effect

Evan Scannapieco, Robert J. Thacker, H. M. P. Couchman

摘要:

活动星系核(AGN)驱动的外流在结构形成中的作用是最重要的问题之一,也是人们认识最少的问题。利用大尺度宇宙学模拟,我们计算了这种外流对小尺度宇宙微波背景(CMB)分布的影响。像引力加热的结构,活动星系核流出诱导CMB扭曲通过热运动和特殊的速度,通过被称为热和动力学的Sunyaev-Zel'dovich(SZ)效应的过程,分别。对于活动星系核流出的热SZ效应是占主导地位的,角功率谱的角分尺度上翻了一番。但是活动星系核反馈的最明显的印记是椭圆星系、星暴后椭圆星系和类星体周围热SZ扭曲的大幅增加,这与外流能量成线性比例。虽然点源减法对于类星体是困难的,但我们表明,通过适当地堆叠早期星系周围的微波测量,新一代的小尺度微波望远镜将能够直接测量AGN反馈,其水平对当前的理论模型很重要。

英文摘要:

One of the most important and poorly-understood issues in structure formation is the role of outflows driven by active galactic nuclei (AGN). Using large-scale cosmological simulations, we compute the impact of such outflows on the small-scale distribution of the cosmic microwave background (CMB). Like gravitationally-heated structures, AGN outflows induce CMB distortions both through thermal motions and peculiar velocities, by processes known as the thermal and kinetic Sunyaev-Zel'dovich (SZ) effects, respectively. For AGN outflows the thermal SZ effect is dominant, doubling the angular power spectrum on arcminute scales. But the most distinct imprint of AGN feedback is a substantial increase in the thermal SZ distortions around elliptical galaxies, post-starburst ellipticals, and quasars, which is linearly proportional to the outflow energy. While point source subtraction is difficult for quasars, we show that by appropriately stacking microwave measurements around early-type galaxies, the new generation of small-scale microwave telescopes will be able to directly measure AGN feedback at the level important for current theoretical models.

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