Stellar Feedback and Resolved Stellar IFU Spectroscopy in the Nearby Spiral Galaxy NGC 300
Stellar Feedback and Resolved Stellar IFU Spectroscopy in the Nearby Spiral Galaxy NGC 300
复制标题
DOI：
10.3847/1538-4357/ab6d63
复制
发表时间：
2019-10
期刊：
影响因子：
--
通讯作者：
A. McLeod;J. Kruijssen;D. Weisz;Peter Zeidler;A. Schruba;J. Dalcanton;S. Longmore;M. Chevance;C. Faesi;N. Byler
中科院分区：
文献类型：
--
作者：
A. McLeod;J. Kruijssen;D. Weisz;Peter Zeidler;A. Schruba;J. Dalcanton;S. Longmore;M. Chevance;C. Faesi;N. Byler
我们目前的MUSE积分场单位（IFU）的五个单独的H II地区的观测在两个巨大的恒星形成复合体的低金属，附近的矮螺旋星系NGC 300。结合高空间分辨率的哈勃空间望远镜测光，我们演示了提取恒星光谱和分类的个别恒星从地面的IFU数据在2 Mpc的距离。对于两个恒星形成复合体，其中没有O型星以前被确定，我们发现了总共13个新确定的O型星和4个沃尔夫-拉叶星（两个已知的来源和两个沃尔夫-拉叶星星候选人，这项工作现在已经证实）。我们使用推导出的大质量恒星的内容来分析恒星反馈对H II区域的影响。正如已经发现的H ii区域中的麦哲伦云，分析NGC 300 H ii区域的动力学是由电离气体和恒星风的压力的组合。此外，我们分析了星星的形成率和电离气体的压力之间的关系，来自小（<100 pc）的尺度，这两个量被系统地高估时，来自星系尺度。随着即将到来的IFU仪器和程序的财富，这项研究作为一个探路者，在附近的星系解决恒星反馈的系统调查，提供必要的分析工具，使大规模的恒星内容和反馈研究采样前所未有的范围内的H ii区域属性在附近的宇宙中的整个星系。
We present MUSE integral field unit (IFU) observations of five individual H ii regions in two giant star-forming complexes in the low-metallicity, nearby dwarf spiral galaxy NGC 300. In combination with high spatial resolution Hubble Space Telescope photometry, we demonstrate the extraction of stellar spectra and classification of individual stars from ground-based IFU data at the distance of 2 Mpc. For the two star-forming complexes, in which no O-type stars had previously been identified, we find a total of 13 newly identified O-type stars and 4 Wolf-Rayet stars (two already-known sources and two Wolf-Rayet star candidates that this work has now confirmed). We use the derived massive stellar content to analyze the impact of stellar feedback on the H ii regions. As already found for H ii regions in the Magellanic Clouds, the dynamics of the analyzed NGC 300 H ii regions are dominated by a combination of the pressure of the ionized gas and stellar winds. Moreover, we analyze the relation between the star formation rate and the pressure of the ionized gas as derived from small (<100 pc) scales, both quantities being systematically overestimated when derived on galactic scales. With the wealth of upcoming IFU instruments and programs, this study serves as a pathfinder for the systematic investigation of resolved stellar feedback in nearby galaxies, delivering the necessary analysis tools to enable massive stellar content and feedback studies sampling an unprecedented range of H ii region properties across entire galaxies in the nearby universe.