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arXiv 1701.03556astro-ph.SRastro-ph.GA
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L1188:一个触发中低质量恒星形成的云-云碰撞的候选者

L1188: a promising candidate of cloud-cloud collision triggering the formation of the low- and intermediate-mass stars

Yan Gong, Min Fang, Ruiqing Mao, Shaobo Zhang, Yuan Wang, Yang Su, Xuepeng Chen, Ji Yang, Hongchi Wang, Dengrong Lu

摘要:

我们提出了一个新的大规模(4平方度)同时$^{12}$ CO,$^{13}$ CO,和C $^{18}$ O($J$ =1 $-$ 0)映射的L1188与PMO 13.7米望远镜。我们的观测结果表明,L1188由两个几乎正交的平行分子云组成,它们的速度明显分离。在显示大速度传播的交叉点处,我们发现了几个连接两个云速度的桥接特征,以及一个开放的弧形结构,该结构具有高激发温度、增强的$^{12}$ CO和$^{12}$ CO发射以及宽的$^{12}$ CO线翼。这与两个云相互碰撞的场景一致。年轻恒星天体(YSO)候选者的分布意味着在两个云的交叉点恒星形成的增强。我们认为L1188在1~Myr前发生了一次云-云碰撞,可能触发了中低质量YSO的形成。

英文摘要:

We present a new large-scale (4 square degrees) simultaneous $^{12}$CO, $^{13}$CO, and C$^{18}$O ($J$=1$-$0) mapping of L1188 with the PMO 13.7-m telescope. Our observations have revealed that L1188 consists of two nearly orthogonal filamentary molecular clouds at two clearly separated velocities. Toward the intersection showing large velocity spreads, we find several bridging features connecting the two clouds in velocity, and an open arc structure which exhibits high excitation temperatures, enhanced $^{12}$CO and $^{13}$CO emission, and broad $^{12}$CO line wings. This agrees with the scenario that the two clouds are colliding with each other. The distribution of young stellar object (YSO) candidates implies an enhancement of star formation in the intersection of the two clouds. We suggest that a cloud-cloud collision happened in L1188 about 1~Myr ago, possibly triggering the formation of low- and intermediate-mass YSOs in the intersection.

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