Galactic reddening in 3D from stellar photometry – an improved map
Galactic reddening in 3D from stellar photometry – an improved map
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DOI：
10.1093/mnras/sty1008
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发表时间：
2018-01
影响因子：
4.8
通讯作者：
G. Green;E. Schlafly;D. Finkbeiner;H. Rix;N. Martin;W. Burgett;P. Draper;H. Flewelling;K. Hoda
中科院分区：
文献类型：
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作者：
G. Green;E. Schlafly;D. Finkbeiner;H. Rix;N. Martin;W. Burgett;P. Draper;H. Flewelling;K. Hoda
我们提出了一张新的星际尘埃变红的 3D 地图，覆盖了四分之三的天空（赤纬 δ ≳ -30°），距离为几千秒差距。该地图基于 Pan-STARRS 1 和 2MASS 8 亿颗恒星的高质量恒星光度测量。我们将天空划分为每条包含数百颗恒星的视线，然后推断恒星的距离和类型，以及视线尘埃分布。我们的新地图包含了更准确的平均灭绝定律和额外 1.5 年的 Pan-STARRS 1 数据，以比我们之前的地图更高的角分辨率追踪尘埃到更大的灭绝。在银河系平面之外，我们的地图与远红外尘埃发射得出的二维红化地图非常吻合。在考虑了 25% 的比例差异后，我们发现我们的地图和基于普朗克远红外发射的尘埃地图之间的平均散射约为 10%，深度为 E(gP1 − rP1) 0.8 mag，天空中的一致性程度各不相同。我们的地图可以从 http://argonaut.skymaps.info 或哈佛 Dataverse（Green 2017）下载。
We present a new 3D map of interstellar dust reddening, covering three quarters of the sky (declinations of δ ≳ −30°) out to a distance of several kiloparsecs. The map is based on high-quality stellar photometry of 800 million stars from Pan-STARRS 1 and 2MASS. We divide the sky into sightlines containing a few hundred stars each, and then infer stellar distances and types, along with the line-of-sight dust distribution. Our new map incorporates a more accurate average extinction law and an additional 1.5 yr of Pan-STARRS 1 data, tracing dust to greater extinctions and at higher angular resolutions than our previous map. Out of the plane of the Galaxy, our map agrees well with 2D reddening maps derived from far-infrared dust emission. After accounting for a 25 per cent difference in scale, we find a mean scatter of ∼10 per cent between our map and the Planck far-infrared emission-based dust map, out to a depth of 0.8 mag in E(gP1 − rP1), with the level of agreement varying over the sky. Our map can be downloaded at http://argonaut.skymaps.info, or from the Harvard Dataverse (Green 2017).