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arXiv 2109.08526astro-ph.GA
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附近矮星系DDO 53中的恒星形成:气体吸积和恒星反馈之间的相互作用

Star formation in the nearby dwarf galaxy DDO 53: interplay between gas accretion and stellar feedback

Oleg V. Egorov, Tatiana A. Lozinskaya, Konstantin I. Vasiliev, Anastasiya D. Yarovova, Ivan S. Gerasimov, Kathryn Kreckel, Alexei V. Moiseev

摘要:

我们提出了一个多波长的研究结果附近的矮星系DDO 53 -一个相对孤立的成员的M 81组。我们分析了原子和电离气体的运动学(基于法布里-珀罗干涉仪在H $α$线上的观测和HI 21 cm线上的存档数据)、电离气体的分布、激发和氧丰度(基于长缝和积分场光谱以及窄带滤波器成像)以及它们与年轻大质量恒星的关系(基于存档的HST数据)。我们探测到一个微弱的2千秒差距大小的电离气体超壳层围绕星系。最有可能的是,这种结构代表了大规模的气体外流,但它也可能是由电离量子从恒星形成区域泄漏到星系盘周围的边缘检测到的原子氢而产生的。我们分析了银河系北部异常HI的性质,发现其特殊的运动学也被电离气体追踪。我们认为,这种HI特征与从星系际介质中捕获的吸积气体云或在>1 Gyr前发生的合并事件后残留的吸积气体云有关。下落的气体在星际介质中产生冲击,并可能支持DDO 53最亮区域的恒星形成活动。

英文摘要:

We present the results of a multiwavelength study of the nearby dwarf galaxy DDO 53 - a relatively isolated member of the M 81 group. We analyse the atomic and ionised gas kinematics (based on the observations with Fabry-Perot interferometer in H$α$ line and archival data in HI 21 cm line), distribution, excitation and oxygen abundance of the ionised gas (based on the long-slit and integral-field spectroscopy and on imaging with narrow-band filters), and their relation with the young massive stars (based on archival HST data). We detect a faint 2-kpc sized supershell of ionised gas surrounding the galaxy. Most probably, this structure represents a large-scale gas outflow, however it could be also created by the ionising quanta leaking from star-forming regions to the marginally detected atomic hydrogen surrounding the galactic disc. We analyse the properties of the anomalous HI in the north part of the galaxy and find that its peculiar kinematics is also traced by ionised gas. We argue that this HI feature is related to the accreting gas cloud captured from the intergalactic medium or remaining after the merger event occurred >1 Gyr ago. The infalling gas produces shocks in the interstellar medium and could support the star formation activity in the brightest region in DDO 53.

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