Ionization and Star Formation in the Giant H ii Region SMC-N66

Ionization and Star Formation in the Giant H ii Region SMC-N66
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巨 H ii 区域 SMC-N66 的电离和恒星形成

DOI:
10.1088/1538-3873/ac697b
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发表时间:
2022
影响因子:
3.5
通讯作者:
Nota, A.
Nota, A.
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Geist, E.;Gallagher, J. S.;Kotulla, R.;Oskinova, L.;Hamann, W.-R.;Ramachandran, V.;Sabbi, E.;Smith, L.;Kniazev, A.;Nota, A.

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小麦哲伦星云中的NGC346年轻恒星系统和相关的N66巨型HII区是低金属丰度(Z≈0.2Z⊙)星系中最接近的大质量恒星形成事件的例子。这个系统的年龄为≲3Myr,为研究大质量恒星及其相关的H II区之间的关系提供了一个独特的机会。利用档案数据,我们得到了总的Hα光度L(Hα)=4.1×10 38erg S−1,对应的H光电离率为3×10 5 0 S−1。与从NGC346中的50多颗已知O星(包括最近从哈勃太空望远镜远紫外谱分类的大质量恒星)的预测的恒星电离率相比较,得到了一个近似的电离平衡。用盐获得的光谱表明,N66的电离结构可能与一些电离光子的泄漏相一致。由于金属丰度低,来自NGC346的FUV光度并不局限于与N66有关的星际云。电离延伸到N66云复合体的大部分空间范围,而大多数云团没有电离。由星云L(Hα)估算的恒星质量似乎低于由已分解恒星普查得到的质量,这可能表明该区域高质量恒星和低质量恒星的形成存在脱节。我们简要地讨论了N66的性质对研究低金属丰度环境中恒星形成和恒星反馈的意义。
The NGC 346 young stellar system and associated N66 giant H ii region in the Small Magellanic Cloud are the nearest example of a massive star-forming event in a low metallicity (Z≈ 0.2Z⊙) galaxy. With an age of≲ 3 Myr this system provides a unique opportunity to study relationships between massive stars and their associated H ii region. Using archival data, we derive a total Hα luminosity of L (Hα)= 4.1× 10 38 erg s− 1 corresponding to an H-photoionization rate of 3× 10 50 s− 1. A comparison with a predicted stellar ionization rate derived from the more than 50 known O-stars in NGC 346, including massive stars recently classified from Hubble Space Telescope far-ultraviolet (FUV) spectra, indicates an approximate ionization balance. Spectra obtained with SALT suggest the ionization structure of N66 could be consistent with some leakage of ionizing photons. Due to the low metallicity, the FUV luminosity from NGC 346 is not confined to the interstellar cloud associated with N66. Ionization extends through much of the spatial extent of the N66 cloud complex, and most of the cloud mass is not ionized. The stellar mass estimated from nebular L (Hα) appears to be lower than masses derived from the census of resolved stars which may indicate a disconnect between the formation of high and low mass stars in this region. We briefly discuss implications of the properties of N66 for studies of star formation and stellar feedback in low metallicity environments.
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发表时间: 1996
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