Herschel observations of FIR emission lines in brightest cluster galaxies

Herschel observations of FIR emission lines in brightest cluster galaxies
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赫歇尔对最亮星团星系中远红外线发射线的观测

DOI:
10.1051/0004-6361/201014569
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发表时间:
2010
影响因子:
6.5
通讯作者:
Edge A
Edge A
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Edge A

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在过去的30年里,星系团核心有多少气体冷却的问题一直是许多多波长研究的焦点。本文介绍了利用Herschel-PACS首次探测到的两个强冷却流团A1068和A2597中的最强原子冷却线[Cii]、[Oi]和[Nii]。这些光谱表明,这些系统中已知存在的大量冷分子气体(> 109)正在受到强烈的紫外线辐射,最有可能来自年轻恒星。这些FIR线的线宽表明,它们共享类似的动力学,但不相同的其他电离和分子气体跟踪的光学,近红外线和CO线。远红外线的相对亮度与CO和远红外线的光度相比,与其他恒星形成星系一致,表明星团核心的分子气体云和它们形成的恒星的性质并不罕见。这些结果提供了额外的证据,冷气体的水库,是由最紧凑的集群的核心气体冷却,并提供了重要的诊断的温度和密度的稠密的云,这种气体驻留。
The question of how much gas cools in the cores of clusters of galaxies has been the focus of many, multiwavelength studies in the past 30 years. In this letter we present the first detections of the strongest atomic cooling lines, [Cii], [Oi] and [Nii] in two strong cooling flow clusters, A1068 and A2597, usingHerschel-PACS. These spectra indicate that the substantial mass of cold molecular gas (> 109) known to be present in these systems is being irradiated by intense UV radiation, most probably from young stars. The line widths of these FIR lines indicate that they share dynamics similar but not identical to other ionised and molecular gas traced by optical, near-infrared and CO lines. The relative brightness of the FIR lines compared to CO and FIR luminosity is consistent with other star-forming galaxies indicating that the properties of the molecular gas clouds in cluster cores and the stars they form are not unusual. These results provide additional evidence for a reservoir of cold gas that is fed by the cooling of gas in the cores of the most compact clusters and provide important diagnostics of the temperature and density of the dense clouds this gas resides in.
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影响因子: --
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