A Near-Infrared Imaging Survey of Coalsack Globule 2
A Near-Infrared Imaging Survey of Coalsack Globule 2
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DOI：
10.1086/342738
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发表时间：
2002-07
期刊：
影响因子：
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通讯作者：
G. Racca;M. Gómez;S. Kenyon
中科院分区：
文献类型：
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作者：
G. Racca;M. Gómez;S. Kenyon
我们描述了对煤袋中的球体2进行的近红外成像观测。这个博克球体是这个南半球分子云密度最高的区域，也是这个复合体中最有可能出现年轻恒星的地方。对K<；14.0，H<；14.5和J<；15.5的测量已经完成，比以前对这个球体的观测敏感了几个数量级。从大量的背景恒星中，我们得到了云的精确的近红外消光规律。我们的结果EJ-H/EH-K=2.08±0.03，比其他南方云的结果要陡峭得多。我们使用J-H/H-K色图来识别该区域K<；14.0的两颗潜在的年轻恒星。我们应用H波段恒星计数来推导出煤袋球体2的密度分布，并使用一个多变模型来描述这一小云的内部结构。对于气体温度T∼15K，这个球体是中等不稳定的。
We describe a near-infrared imaging survey of Globule 2 in the Coalsack. This Bok globule is the highest-density region of this southern hemisphere molecular cloud and is the most likely location for young stars in this complex. The survey is complete for K < 14.0, H < 14.5, and J < 15.5, several magnitudes more sensitive than previous observations of this globule. From the large number of background stars, we derive an accurate near-infrared extinction law for the cloud. Our result, EJ-H/EH-K = 2.08 ± 0.03, is significantly steeper than results for other southern clouds. We use the J-H/H-K color-color diagram to identify two potential young stars with K < 14.0 in the region. We apply H-band star counts to derive the density profile of Coalsack Globule 2 and use a polytropic model to describe the internal structure of this small cloud. For a gas temperature T ∼ 15 K, this globule is moderately unstable.