NEAR-INFRARED H 2 AND CONTINUUM SURVEY OF EXTENDED GREEN OBJECTS
NEAR-INFRARED H 2 AND CONTINUUM SURVEY OF EXTENDED GREEN OBJECTS
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近红外 H 2 和扩展绿色物体的连续测量
DOI：
10.1088/0067-0049/200/1/2
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
Lee H
中科院分区：
文献类型：
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作者：
Lee H
斯皮策瞥见巡天发现了一些“扩展绿色物体”（ego），它们显示出4.5 μm的扩展发射。这些ego是高质量原恒星外流的潜在候选者。我们使用来自英国红外望远镜的高分辨率（< 1”）H 2 1 - 0 S(1)线，K-和H波段图像研究了34个ego，以探讨它们的性质。我们发现12个ego具有h2外流（2个具有h2结链结构，5个具有扩展的h2双极性结构，3个具有扩展的h2裂片，2个具有对h2结）。在12个具有h2出口的ego中，有3个在4.5 μm和h2发射之间表现出相似的形貌。然而，其余9个ego显示h2特征比连续统特征更扩展，并且h2排放很少与连续统排放相关。此外，具有k波段发射的ego的近红外连续光谱和4.5 μm发射形貌相似，这表明ego的ir -波段连续发射至少有一部分来自于嵌入的年轻恒星物体的散射光。
The Spitzer GLIMPSE survey has revealed a number of" Extended Green Objects"(EGOs) that display extended emission at 4.5 μm. These EGOs are potential candidates for high-mass protostellar outflows. We used high-resolution (< 1'') H 2 1–0 S (1) line, K-, and H-band images from the United Kingdom Infrared Telescope to study 34 EGOs to investigate their nature. We found that 12 EGOs exhibit H 2 outflows (two with chains of H 2 knotty structures, five with extended H 2 bipolar structures, three with extended H 2 lobes, and two with pairs of H 2 knots). Of the 12 EGOs with H 2 outflows, three exhibit similar morphologies between the 4.5 μm and H 2 emission. However, the remaining nine EGOs show that the H 2 features are more extended than the continuum features, and the H 2 emission is seldom associated with continuum emission. Furthermore, the morphologies of the near-infrared continuum and 4.5 μm emission are similar to each other for those EGOs with K-band emission, implying that at least part of the IRAC-band continuum emission of EGOs comes from scattered light from the embedded young stellar objects.