用ASKAP -- FLASH研究GPS和CSS源的气体生成环境
The gaseous natal environments of GPS and CSS sources with ASKAP -- FLASH
摘要：
GPS和CSS源被认为代表了一个年轻的和/或有限的射电大声活动星系核（AGN）的子种群，尚未疏散周围的星际气体。通过研究这些天体的气体环境，我们可以了解星系和它们的超大质量黑洞（SMBH）之间的相互依赖关系。第一次HI大吸收巡天（FLASH）将对中等宇宙学红移的星系中的中性氢原子（HI）气体进行普查。FLASH预计将探测到至少几百个与GPS和CSS源有关的HI吸收体。这些吸收器提供了一个重要的探测线的视线中性气体对无线电活动星系核的丰度和运动学，在某些情况下，揭示了气体与下落云和外流。FLASH试点调查第一阶段的观测现已完成，早期分析已经产生了几个探测结果，包括GPS源PKS 2311 $-$ 477。这个星系的光学成像揭示了一个相互作用的系统，该系统可能提供了吸收中看到的中性气体，并触发了无线电响亮的活动星系核。FLASH将提供一个具有统计意义的样本，可以用来研究致密射电星系之间这种富含气体的相互作用的普遍性。
英文摘要：
GPS and CSS sources are thought to represent a young and/or confined sub-population of radio-loud active galactic nuclei (AGN) that are yet to evacuate their surrounding ambient interstellar gas. By studying the gaseous environments of these objects we can gain an insight into the inter-dependent relationship between galaxies and their supermassive black holes (SMBHs). The First Large Absorption Survey in HI (FLASH) will build a census of the neutral atomic hydrogen (HI) gas in galaxies at intermediate cosmological redshifts. FLASH is expected to detect at least several hundred HI absorbers associated with GPS and CSS sources. These absorbers provide an important probe of the abundance and kinematics of line-of-sight neutral gas towards radio AGN, in some cases revealing gas associated with infalling clouds and outflows. Observations are now complete for the first phase of the FLASH Pilot Survey and early analysis has already yielded several detections, including the GPS source PKS2311$-$477. Optical imaging of this galaxy reveals an interacting system that could have supplied the neutral gas seen in absorption and triggered the radio-loud AGN. FLASH will provide a statistically significant sample with which the prevalence of such gas-rich interactions amongst compact radio galaxies can be investigated.
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