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arXiv 1502.06976astro-ph.GA
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M81中心的热泡

A hot bubble at the centre of M81

T. V. Ricci, J. E. Steiner, L. Giansante

摘要:

上下文梅西耶81有最近的活动核,具有宽的H $α$发射。对这个星系中心的详细研究对于理解活动星系核现象的最内部结构非常重要。目的。我们的目标是使用额外的技术来寻找以前未被发现的结构,以重新分析安装在双子座北望远镜上的GMOS-IFU获得的数据立方体(Schnorr Müller等人,2011年)。法我们分析了数据立方体使用技术的降噪,空间反卷积,星光减法,PCA层析成像,并与HST图像比较。结果我们确定了一个热泡与T $>$ 43500 K,这是与强发射的[N II] $λ$ 5755 K和高[O I] $λ$ 6300/H $α$的比例;泡沫显示出一个蓝色的连续体,由薄壳的H $α$ + [N II]发射包围。我们还重新解释了Schnorr Müller等人(2011)发现的外流,表明蓝移锥几乎与无线电喷流重合,正如预期的那样。结论.我们将热泡解释为由后星暴事件引起的,这些事件留下了一个或多个年轻恒星的星团,类似于在银河系中心发现的星团,如拱门和IRS 16星团。来自年轻恒星风或超新星遗迹的冲击结构可能是造成这种高温气体和低电离辐射的原因。

英文摘要:

Context. Messier 81 has the nearest active nucleus with broad H$α$ emission. A detailed study of this galaxy's centre is important for understanding the innermost structure of the AGN phenomenon. Aims. Our goal is to seek previously undetected structures using additional techniques to reanalyse a data cube obtained with the GMOS-IFU installed on the Gemini North telescope (Schnorr Müller et al. 2011). Method. We analysed the data cube using techniques of noise reduction, spatial deconvolution, starlight subtraction, PCA tomography, and comparison with HST images. Results. We identified a hot bubble with T $>$ 43500 K that is associated with strong emission of [N II]$λ$5755Å and a high [O I]$λ$6300/H$α$ ratio; the bubble displays a bluish continuum, surrounded by a thin shell of H$α$ + [N II] emission. We also reinterpret the outflow found by Schnorr Müller et al. (2011) showing that the blueshifted cone nearly coincides with the radio jet, as expected. Conclusions. We interpret the hot bubble as having been caused by post starburst events that left one or more clusters of young stars, similar to the ones found at the centre of the Milky Way, such as the Arches and the IRS 16 clusters. Shocked structures from combined young stellar winds or supernova remnants are probably the cause of this hot gas and the low ionization emission.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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