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首页> 外文期刊>The Astrophysical journal >MSX, 2MASS, and the Large Magellanic Cloud: A Combined Near- and Mid-Infrared View
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MSX, 2MASS, and the Large Magellanic Cloud: A Combined Near- and Mid-Infrared View

机译:MSX,2MASS和大型麦哲伦星云:组合的近红外和中红外视图

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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.
机译:大中麦哲伦星云(LMC)已通过中红外空间实验(MSX)和近红外的两微米全天候测量(2MASS)观测到。我们对1806个MSX目录源和近140万个2MASS分类点和扩展源进行了互相关,找到了1664个匹配项。使用可用的颜色信息,我们确定了许多恒星种群和星云,包括主序恒星,巨型恒星,红色超巨星,富含碳和氧的渐近巨型分支(AGB)恒星,行星状星云,H II区和其他可能与早期恒星有关的尘土飞扬的物体。这些来源中共有731个没有先前的标识。我们编译所有物体的清单,其中包括测光法和天文测量法。 MSX灵敏度8.3μm是检测物体的限制因素:在LMC中仅检测到较亮的红色物体,特别是红色超巨星,AGB恒星,行星状星云和H II区域。其余物体可能位于银河系前景中。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银河系的演化。我们证明了组合的中红外和近红外光度基线提供了一种强大的手段,可以识别LMC中的新物体,以用于未来的地面和空基后续观察。

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