THE MYSTERIOUS SICKLE OBJECT IN THE CARINA NEBULA: A STELLAR WIND INDUCED BOW SHOCK GRAZING A CLUMP?

THE MYSTERIOUS SICKLE OBJECT IN THE CARINA NEBULA: A STELLAR WIND INDUCED BOW SHOCK GRAZING A CLUMP?
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船底座星云中神秘的镰状天体:恒星风引起的弓形激波擦过一团?

DOI:
10.1088/0004-637x/769/2/139
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发表时间:
2013
期刊:
The Astrophysical Journal
影响因子:
--
通讯作者:
A. Burkert
A. Burkert
中科院分区:
--
文献类型:
--
作者:
J. Ngoumou;Th. Preibisch;Th. Ratzka;A. Burkert

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船底座星云的光学和近红外图像显示了一个奇特的弧形特征,我们称之为”镰刀”,靠近B型星星特朗普14 MJ 218。我们使用多波长观测来探索和约束星云的性质和起源。使用APEX/LABOCA的亚毫米数据以及赫歇尔远红外地图,我们发现了一个密集的,紧凑的团块,质量为1.40兆吨,位于靠近镰刀的顶点。我们研究了B星星MJ 218、镰刀和星团之间的关系。我们的数值模拟表明,原则上,一个B型星星位于一个集群的边缘附近可以产生一个新月形的风激波阵面,类似于观察到的形态。然而,观测到的MJ 218的自行表明,这颗星星以高速(每秒100公里)穿过周围的星际气体。我们认为,该星星只是要擦过沿着表面的团块,和镰刀是弓激波引起的恒星风,作为对象的运动超音速通过密度梯度的信封中的团块。
Optical and near-infrared images of the Carina Nebula show a peculiar arc-shaped feature, which we call the" Sickle," next to the B-type star Trumpler 14 MJ 218. We use multi-wavelength observations to explore and constrain the nature and origin of the nebulosity. Using submillimeter data from APEX/LABOCA as well as Herschel far-infrared maps, we discovered a dense, compact clump with a mass of∼ 40 M☉ located close to the apex of the Sickle. We investigate how the B star MJ 218, the Sickle, and the clump are related. Our numerical simulations show that, in principle, a B-type star located near the edge of a clump can produce a crescent-shaped wind shock front, similar to the observed morphology. However, the observed proper motion of MJ 218 suggests that the star moves with high velocity (∼ 100 km s− 1) through the ambient interstellar gas. We argue that the star is just about to graze along the surface of the clump, and the Sickle is a bow shock induced by the stellar wind, as the object moves supersonically through the density gradient in the envelope of the clump.
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