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arXiv 2003.13925astro-ph.GA
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船底座星云复合体和Gum 31中的大质量恒星形成-- I。船底座星云

Massive star formation in the Carina nebula complex and Gum 31 -- I. The Carina nebula complex

Shinji Fujita, Hidetoshi Sano, Rei Enokiya, Katsuhiro Hayashi, Mikito Kohno, Kisetsu Tsuge, Kengo Tachihara, Atsushi Nishimura, Akio Ohama, Yumiko Yamane, Takah… 展开作者

Shinji Fujita, Hidetoshi Sano, Rei Enokiya, Katsuhiro Hayashi, Mikito Kohno, Kisetsu Tsuge, Kengo Tachihara, Atsushi Nishimura, Akio Ohama, Yumiko Yamane, Takahiro Ohno, Rin Yamada, Yasuo Fukui

摘要:

在这里,我们提出的12 CO(J=1-0),13 CO(J=1-0),和12 CO(J=2-1)发射线的观测结果向船底座星云复合体(CNC)获得的Mopra和NANTEN 2望远镜。我们专注于与CNC相关的恒星形成区域,包括三个星团Tr 14,Tr 15和Tr 16,以及孤立的WR星HD 92740。我们发现CNC中的分子云主要以-27、-20、-14和-8 km/s的速度分成四个云。它们的质量分别为0.7x10^4 Msun、5.0x10^4 Msun、1.6x10^4 Msun和0.7x10^4 Msun。大部分的恒星可能与星团有关,因为它们的12 CO(J=2-1)/12 CO(J=1-0)强度比很高,并且与斯皮策8微米的分布相对应。此外,这些云还显示了云与云碰撞的观测特征。特别是在位置-速度图上有一个V型结构,在-20 km/s云和-14 km/s云之间有一个互补的空间分布。基于这些观测特征,我们提出了一个方案,其中星团中大质量恒星的形成是由两个云之间的碰撞引发的。通过使用碰撞的路径长度和假设的速度分离,我们估计碰撞的时间尺度为~ 100万年。这与以前研究中估计的集群年龄相当。

英文摘要:

Herein, we present results from observations of the 12CO (J=1-0), 13CO (J=1-0), and 12CO (J=2-1) emission lines toward the Carina nebula complex (CNC) obtained with the Mopra and NANTEN2 telescopes. We focused on massive-star-forming regions associated with the CNC including the three star clusters Tr14, Tr15, and Tr16, and the isolated WR-star HD92740. We found that the molecular clouds in the CNC are separated into mainly four clouds at velocities -27, -20, -14, and -8 km/s. Their masses are 0.7x10^4Msun, 5.0x10^4 Msun, 1.6x10^4 Msun, and 0.7x10^4 Msun, respectively. Most are likely associated with the star clusters, because of their high 12CO (J=2-1)/12CO (J=1-0) intensity ratios and their correspondence to the Spitzer 8 micron distributions. In addition, these clouds show the observational signatures of cloud--cloud collisions. In particular, there is a V-shaped structure in the position--velocity diagram and a complementary spatial distribution between the -20 km/s cloud and the -14 km/s cloud. Based on these observational signatures, we propose a scenario wherein the formation of massive stars in the clusters was triggered by a collision between the two clouds. By using the path length of the collision and the assumed velocity separation, we estimate the timescale of the collision to be ~1 Myr. This is comparable to the ages of the clusters estimated in previous studies.

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