MSX, 2MASS, and the Large Magellanic Cloud: A Combined Near- and Mid-Infrared View
MSX, 2MASS, and the Large Magellanic Cloud: A Combined Near- and Mid-Infrared View
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MSX、2MASS 和大麦哲伦云：近红外和中红外组合视图
DOI：
10.1086/323309
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
S. Price
中科院分区：
文献类型：
--
作者：
M. Egan;S. V. van Dyk;S. Price
大麦哲伦云（LMC）已经被中途空间实验（MSX）在中红外和2微米全天巡天（2MASS）在近红外观测到。我们对1806个MSX星表源和近140万个2MASS星表点源和扩展源进行了交叉相关，找到了1664个匹配。利用现有的颜色信息，我们确定了一些恒星种群和星云，包括主序星，巨星，红超巨星，富碳和富氧的渐近巨星分支（AGB）的恒星，行星状星云，H II区域，和其他尘埃物体可能与早期类型的恒星。其中共有731名消息来源之前没有身份证明。我们编制了一份所有天体的清单，其中包括测光和天体测量。8.3 μm的MSX灵敏度是天体探测的限制因素：只有更明亮的红色天体，特别是红超巨星、AGB星、行星状星云和H II区域，在LMC中被探测到。其余的物体可能在银河系的前景。红外LMC源的空间分布可能有助于理解恒星的形成和演化以及整个星系的演化。我们证明，一个综合的中红外和近红外光度基线提供了一个强大的手段，确定新的对象在LMC未来的地基和天基后续观测。
The Large Magellanic Cloud (LMC) has been observed by the Midcourse Space Experiment (MSX) in the mid-infrared and the Two Micron All Sky Survey (2MASS) in the near-infrared. We have performed a cross-correlation of the 1806 MSX catalog sources and nearly 1.4 million 2MASS cataloged point and extended sources and find 1664 matches. Using the available color information, we identify a number of stellar populations and nebulae, including main-sequence stars, giant stars, red supergiants, carbon- and oxygen-rich asymptotic giant branch (AGB) stars, planetary nebulae, H II regions, and other dusty objects likely associated with early-type stars. A total of 731 of these sources have no previous identification. We compile a listing of all objects, which includes photometry and astrometry. The 8.3 μm MSX sensitivity is the limiting factor for object detection: only the brighter red objects, specifically the red supergiants, AGB stars, planetary nebulae, and H II regions, are detected in the LMC. The remaining objects are likely in the Galactic foreground. The spatial distribution of the infrared LMC sources may contribute to understanding stellar formation and evolution and the overall galactic evolution. We demonstrate that a combined mid- and near-infrared photometric baseline provides a powerful means of identifying new objects in the LMC for future ground-based and space-based follow-up observations.