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arXiv 1708.01362astro-ph.GA
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低表面亮度半导体中的分子气体与恒星形成

Molecular Gas and Star-Formation In Low Surface Brightness Galaxies

Tian-Wen Cao, Hong Wu, Wei Du, Feng-Jie Lei, Ming Zhu, Jan Wouterloot, Harriet Parsons, Yi-Nan Zhu, Chao-Jian Wu, Fan Yang, Chen Cao, Zhi-Min Zhou, Min He, Jun-… 展开作者

Tian-Wen Cao, Hong Wu, Wei Du, Feng-Jie Lei, Ming Zhu, Jan Wouterloot, Harriet Parsons, Yi-Nan Zhu, Chao-Jian Wu, Fan Yang, Chen Cao, Zhi-Min Zhou, Min He, Jun-Jie Jin, James E. Wicker

摘要:

我们用JCMT 15米望远镜获得了9个面对低表面亮度星系(LSBG)的CO(J=2-1)光谱,并用NAOC的2.16米望远镜观测了Ha图像。由于未检测到CO,因此仅给出H2质量的上限。氢分子总质量的上限约为(1.2-82.4)× 10^7 Msun。它们的恒星形成率主要低于0.4 Msun/yr,恒星形成效率低于1.364 × 10^10 /yr。我们的结果表明,分子气体含量的缺乏是恒星形成率低的直接原因。低的成星效率可能是由于HI气体转化为H2气体的效率低。

英文摘要:

We have obtained CO(J=2-1) spectra of nine face-on low surface brightness galaxies(LSBGs) using the JCMT 15-meter telescope and observed Ha images using the 2.16-meter telescope of NAOC. As no CO has been detected, only upper limits on the H2 masses are given. The upper limits of total molecular hydrogen masses are about (1.2-82.4) x 10^7 Msun. Their star formation rates are mainly lower than 0.4 Msun/yr and star formation efficiencies are lower than 1.364 x 10^10 /yr. Our results show that the absence of molecular gas content is the direct reason for the low star formation rate. The low star formation efficiency probably resulted from the low efficiency of HI gas transforming to H2 gas.

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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