论文标题
更新的GAIA-2MASS 3D银河系尘埃
Updated Gaia-2MASS 3D maps of Galactic interstellar dust
论文作者
论文摘要
银河系尘的三维（3D）地图是用于广泛用途的工具。我们的目标是在当地的手臂和周围地区建造3D尘埃灭绝。 GAIA EDR3光度数据与2个质量测量结果结合使用，以灭绝为恒星，具有准确的光度法和相对不确定性的视差小于20％。我们应用了适合目标恒星不均匀的空间分布的层次反演算法，以列入这种灭绝目录。我们介绍了更新的3D尘埃灭绝分布，并估算了3D地图中从太阳到每个区域的集成灭绝的错误。计算区域类似于以前的DR2图之一，即6 kpc x 6 kpc x 0.8 kpcastrophysics围绕太阳的体积。由于添加了淡淡的目标恒星，因此可以重建云的体积增加了。由于EDR3中的视差和光度数据的准确性提高，相邻目标之间的灭绝更加一致，从而使一个在密集区域中达到了增加的对比度，而空腔轮廓更正常。我们与尘埃和恒星分布的最新结果进行了几次比较。更好地看到灰尘浓度平面周围的波浪形图案，并存在于大区域。它的平均垂直峰峰幅度为300 pc的阶。有趣的是，它类似于Gaia数据中发现的壮观蜗牛形恒星运动学模式的垂直时期。 GAIA EDR3目录可以显着改善灭绝图，并确认其对大量数据集的效率。未来的星际物质和恒星分布之间的比较可能有助于了解哪些合并或内部扰动在前3 kpc内塑造了银河系。
Three-dimensional (3D) maps of Galactic interstellar dust are a tool for a wide range of uses. We aim to construct 3D maps of dust extinction in the Local Arm and surrounding regions. Gaia EDR3 photometric data were combined with 2MASS measurements to derive extinction towards stars with accurate photometry and relative uncertainties on parallaxes of less than 20%. We applied our hierarchical inversion algorithm adapted to inhomogeneous spatial distributions of target stars to this catalogue of extinctions. We present the updated 3D dust extinction distribution and provide an estimate of the error on integrated extinctions from the Sun to each area in the 3D map. The computational area is similar to the one of the previous DR2 map, a 6 kpc x 6 kpc x 0.8 kpcAstrophysics volume around the Sun. Due to the addition of fainter target stars, the volume in which the clouds can be reconstructed has increased. Due to the improved accuracy of the parallaxes and photometric data in EDR3, extinctions among neighbouring targets are more consistent, allowing one to reach an increased contrast in the dense areas, while cavity contours are more regular. We show several comparisons with recent results on dust and star distributions. The wavy pattern around the Plane of the dust concentrations is better seen and exists over large regions. Its mean vertical peak-to-peak amplitude is of the order of 300 pc; interestingly, it is similar to the vertical period of the spectacular snail-shaped stellar kinematical pattern discovered in Gaia data. The Gaia EDR3 catalogue allows for a significant improvement of the extinction maps to be made and the hierarchical technique confirms its efficiency for massive datasets. Future comparisons between 3D maps of interstellar matter and stellar distributions may help to understand which mergers or internal perturbations have shaped the Galaxy within the first 3 kpc.
