MOLECULAR CLOUDS TOWARD THE SUPER STAR CLUSTER NGC 3603; POSSIBLE EVIDENCE FOR A CLOUD–CLOUD COLLISION IN TRIGGERING THE CLUSTER FORMATION
MOLECULAR CLOUDS TOWARD THE SUPER STAR CLUSTER NGC 3603; POSSIBLE EVIDENCE FOR A CLOUD–CLOUD COLLISION IN TRIGGERING THE CLUSTER FORMATION
复制标题
DOI：
10.1088/0004-637x/780/1/36
复制
发表时间：
2013-06
期刊：
影响因子：
--
通讯作者：
Y. Fukui;A. Ohama;N. Hanaoka;N. Furukawa;K. Torii;J. Dawson;N. Mizuno;K. Hasegawa;T. Fukuda;S. Soga;N. Moribe;Y. Kuroda;T. Hayakawa;A. Kawamura;T. Kuwahara;H. Yamamoto;T. Okuda;T. Onishi;H. Maezawa;A. Mizuno
中科院分区：
文献类型：
--
作者：
Y. Fukui;A. Ohama;N. Hanaoka;N. Furukawa;K. Torii;J. Dawson;N. Mizuno;K. Hasegawa;T. Fukuda;S. Soga;N. Moribe;Y. Kuroda;T. Hayakawa;A. Kawamura;T. Kuwahara;H. Yamamoto;T. Okuda;T. Onishi;H. Maezawa;A. Mizuno
我们利用NANTEN2对超级星团NGC 3603在12CO（J = 2-1, J = 1-0）和13CO（J = 2-1, J = 1-0）跃迁过程中的分子云进行了新的大场观测。我们认为在13 km s - 1和28 km s - 1的两个分子云与NGC 3603有关，这可以从朝向H区的较高温度和形态对应中得到证明。考虑到云的相对运动为~ 20 km s−1，云的质量太小而无法被引力束缚。我们认为，这两个星云在1亿年前相互碰撞，触发了超级星团的形成。这种情况能够解释星团中质量最大的恒星群的起源，这些恒星群的年龄只有1兆光年，并且被隔离在星团的中央子星系内。这是继Westerlund 2之后的第二个超级星团，其形成可能是由云-云碰撞引发的。
We present new large field observations of molecular clouds with NANTEN2 toward the super star cluster NGC 3603 in the transitions 12CO(J = 2–1, J = 1–0) and 13CO(J = 2–1, J = 1–0). We suggest that two molecular clouds at 13 km s−1 and 28 km s−1 are associated with NGC 3603 as evidenced by higher temperatures toward the H ii region, as well as morphological correspondence. The mass of the clouds is too small to gravitationally bind them, given their relative motion of ∼20 km s−1. We suggest that the two clouds collided with each other 1 Myr ago to trigger the formation of the super star cluster. This scenario is able to explain the origin of the highest mass stellar population in the cluster, which is as young as 1 Myr and is segregated within the central sub-pc of the cluster. This is the second super star cluster along with Westerlund 2 where formation may have been triggered by a cloud–cloud collision.