KINEMATIC STRUCTURE OF MOLECULAR GAS AROUND HIGH-MASS YSO, PAPILLON NEBULA, IN N159 EAST IN THE LARGE MAGELLANIC CLOUD: A NEW PERSPECTIVE WITH ALMA-猫眼课题宝

DOI：

10.3847/1538-4357/835/1/108

发表时间：

2016-04

期刊：

The Astrophysical Journal

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

K. Saigo;T. Onishi;O. Nayak;M. Meixner;K. Tokuda;R. Harada;Yuuki Morioka;M. Sewiło;R. Indebetouw;K. Torii;A. Kawamura;A. Ohama;Y. Hattori;H. Yamamoto;K. Tachihara;T. Minamidani;T. Inoue;S. Madden;M. Galametz;V. Lebouteiller;C. Chen;N. Mizuno;Y. Fukui

我们展示了针对大麦哲伦星系（LMC）中N159东巨分子云（N159E）的12CO(2 - 1)、13CO(2 - 1)、H30α复合线、约98 GHz的自由 - 自由辐射以及约230 GHz的尘埃热辐射的阿塔卡马大型毫米波/亚毫米波阵列（ALMA）3波段和6波段的观测结果。LMC是距离我们50千秒差距的最近的活跃的高质量恒星形成的正向星系，是研究高质量恒星形成的最佳目标。ALMA观测表明，N159E是丝状云的复合体，其宽度和长度约为1秒差距和几个秒差距。根据13CO(2 - 1)的强度，总分子质量为0.92×10⁵ M⊙。N159E包含著名的蝴蝶星云，一个致密的高激发H II区。我们发现与蝴蝶星云相关的一个年轻恒星体（YSO）质量为35 M⊙，且位于三个丝状云的交汇处。这表明高质量YSO的形成是由丝状云的碰撞引发的。福井等人报道了N159西区域两个YSO具有类似的运动学结构，这两个YSO的质量也≳35 M⊙。这表明丝状云的碰撞是高质量恒星形成的一种主要机制。我们在蝴蝶星云中的YSO周围发现了一个亚秒差距尺度的小分子空洞。它被自由 - 自由辐射和H30α辐射填充。空洞周围分子气体的温度达到约80 K。这表明这个YSO刚刚开始破坏其母分子云。

We present the ALMA Band 3 and Band 6 results of 12CO(2-1), 13CO(2-1), H30α recombination line, free–free emission around 98 GHz, and the dust thermal emission around 230 GHz toward the N159 East Giant Molecular Cloud (N159E) in the Large Magellanic Cloud (LMC). LMC is the nearest active high-mass star-forming face-on galaxy at a distance of 50 kpc and is the best target for studing high-mass star formation. ALMA observations show that N159E is the complex of filamentary clouds with the width and length of ∼1 pc and several parsecs. The total molecular mass is 0.92 × 105 M⊙ from the 13CO(2-1) intensity. N159E harbors the well-known Papillon Nebula, a compact high-excitation H ii region. We found that a YSO associated with the Papillon Nebula has the mass of 35 M⊙ and is located at the intersection of three filamentary clouds. It indicates that the formation of the high-mass YSO was induced by the collision of filamentary clouds. Fukui et al. reported a similar kinematic structure toward two YSOs in the N159 West region, which are the other YSOs that have the mass of ≳35 M⊙. This suggests that the collision of filamentary clouds is a primary mechanism of high-mass star formation. We found a small molecular hole around the YSO in Papillon Nebula with a sub-parsec scale. It is filled by free–free and H30α emission. The temperature of the molecular gas around the hole reaches ∼80 K. It indicates that this YSO has just started the distruction of parental molecular cloud.

KINEMATIC STRUCTURE OF MOLECULAR GAS AROUND HIGH-MASS YSO, PAPILLON NEBULA, IN N159 EAST IN THE LARGE MAGELLANIC CLOUD: A NEW PERSPECTIVE WITH ALMA

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