论文标题
由背景星系-III所追踪的麦哲伦云的固有红色。大麦芽云
The intrinsic reddening of the Magellanic Clouds as traced by background galaxies -- III. The Large Magellanic Cloud
论文作者
论文摘要
我们介绍了使用光学（Ugriz）和近红外（IR; YJKS）光谱能量分布（SEDS）得出的大麦芽云（LMC）的〜90度$^{2} $的总固有变红的地图。红色图是由基于Lephare $χ^{2} $最小化SED拟合程序的222,752个早期类型星系的样本创建的。我们发现，LMC的中央（4x4 v $^2 $）区域的增强固有变红区域与低水平普遍性粉尘发射的形态相同，如Far-Ir发射所追踪。此外，我们能够区分与已知的恒星形成区域一致的较小的，孤立的增强和在形态图中观察到的年轻恒星的聚类。然而，与30多拉多斯以南的分子脊相关的红色水平要小于文献红色地图。由于灭绝和拥挤，在该区域检测到的星系数量减少，可能会使我们的结果偏向较低的红色值。我们的地图与从红色团恒星得出的地图以及对LMC的恒星形成历史的分析一致。这项研究代表了LMC背后的最早的大规模分类之一，因此，我们为全部约250万个来源样本提供了Lephare输出。
We present a map of the total intrinsic reddening across ~90 deg$^{2}$ of the Large Magellanic Cloud (LMC) derived using optical (ugriz) and near-infrared (IR; YJKs) spectral energy distributions (SEDs) of background galaxies. The reddening map is created from a sample of 222,752 early-type galaxies based on the LEPHARE $χ^{2}$ minimisation SED-fitting routine. We find excellent agreement between the regions of enhanced intrinsic reddening across the central (4x4 deg$^2$) region of the LMC and the morphology of the low-level pervasive dust emission as traced by far-IR emission. In addition, we are able to distinguish smaller, isolated enhancements that are coincident with known star-forming regions and the clustering of young stars observed in morphology maps. The level of reddening associated with the molecular ridge south of 30 Doradus is, however, smaller than in the literature reddening maps. The reduced number of galaxies detected in this region, due to high extinction and crowding, may bias our results towards lower reddening values. Our map is consistent with maps derived from red clump stars and from the analysis of the star formation history across the LMC. This study represents one of the first large-scale categorisations of extragalactic sources behind the LMC and as such we provide the LEPHARE outputs for our full sample of ~2.5 million sources.
