GLIMPSE巡天中的扩展绿色天体（EGO）目录：大质量年轻恒星外流候选者的新样本
A Catalog of Extended Green Objects (EGOs) in the GLIMPSE Survey: A new sample of massive young stellar object outflow candidates
摘要：
利用斯皮策GLIMPSE Legacy调查的图像，我们已经确定了300多个扩展的4.5微米源（缩写为EGO，扩展的绿色对象，用于在3色复合IRAC图像中将[4.5]带编码为绿色）。我们提出了这些EGO的目录，包括在3.6，4.5，5.8，8.0和24微米的GLIMPSE和MIPSGAL调查的综合通量密度测量。我们样本中的源与最近的IRAS点源之间的平均角间距>1弧分。大多数的EGO与红外暗云（IRDC），高分辨率6.7 GHz的甲醇脉泽调查重叠的GLIMPSE覆盖范围，EGO和6.7 GHz的甲醇脉泽是强烈相关的。扩展4.5微米的发射被认为是追踪原恒星外流中的冲击分子气体; EGO与IRDC和6.7 GHz甲醇脉泽的关联表明，扩展4.5微米的发射可能会精确定位大质量原恒星的外流。EGO的中红外颜色位于仍然嵌入在下落包层中的年轻原恒星所占据的色-色空间区域。
英文摘要：
Using images from the Spitzer GLIMPSE Legacy survey, we have identified more than 300 extended 4.5 micron sources (abbreviated EGO, Extended Green Object, for the common coding of the [4.5] band as green in 3-color composite IRAC images). We present a catalog of these EGOs, including integrated flux density measurements at 3.6, 4.5, 5.8, 8.0, and 24 microns from the GLIMPSE and MIPSGAL surveys. The average angular separation between a source in our sample and the nearest IRAS point source is >1 arcminute. The majority of EGOs are associated with infrared dark clouds (IRDCs), and where high-resolution 6.7 GHz methanol maser surveys overlap the GLIMPSE coverage, EGOs and 6.7 GHz methanol masers are strongly correlated. Extended 4.5 micron emission is thought to trace shocked molecular gas in protostellar outflows; the association of EGOs with IRDCs and 6.7 GHz methanol masers suggests that extended 4.5 micron emission may pinpoint outflows specifically from massive protostars. The mid-infrared colors of EGOs lie in regions of color-color space occupied by young protostars still embedded in infalling envelopes.
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