Three-dimensional extinction maps: Inverting inter-calibrated extinction catalogues
Three-dimensional extinction maps: Inverting inter-calibrated extinction catalogues
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三维消光图：反演相互校准的消光目录
DOI：
10.1051/0004-6361/202243319
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
N. Cox
中科院分区：
文献类型：
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作者：
J. Vergely;R. Lallement;N. Cox
银河系消光密度的 3D 地图可以通过反演单个目标恒星的距离-消光对目录来构建。可以实现的地图的空间分辨率随着目标的空间密度的增加而增加，并且随后随着目录的组合而增加。然而，这需要他们仔细的相互校准。我们的目标是开发两个不同目录的相互校准方法。我们使用分光光度目录作为参考。对第二个目录在 G、GB、GR、J、H、K 多颜色空间中进行主成分分析。由前两个分量构成的子空间被分成单元，我们在其中估计与参考的偏差。使用位于每个次要目标的短空间距离处的参考的所有目标来计算偏差。为多色空间中的每个单元推导了校正和过滤。我们将该技术应用于两个不同的数据集：一方面是分光光度目录，另一方面是基于 Gaia eDR3 和 2MASS 光度测定的灭绝目录。校准后，无论本地是否存在参考目标，第二目录中相邻点之间的消光离散度都会减小。薄弱的结构就会更加明显。高银河纬度目标的消亡与尘埃排放的相关性更为紧密，这是从第一个目录中获得的属性。将分层反演技术应用于两个合并的相互校准目录，以生成对应于不同体积和最大空间分辨率的 3D 消光密度图。对于太阳周围的 3000x3000x800pc3 体积，最大分辨率为 10pc，对于分辨率 50pc，贴图的最大尺寸为 10x10x0.8 kpc3。地图可以通过在线工具下载或使用。
3D maps of the extinction density in the Galaxy can be built through the inversion of catalogues of distance-extinction pairs for individual target stars. The spatial resolution of the maps that can be achieved increases with the spatial density of the targets, and subsequently with the combination of catalogues. However, this requires their careful inter-calibration. Our aim is to develop methods of inter-calibration of two different catalogues. We used as reference a spectrophotometric catalogue. A principal component analysis was performed in G,GB,GR,J,H,K multi-colour space for the second catalog. The subspace constituted by the two first components was split into cells in which we estimated deviations from the reference. The deviations were computed using all targets from the reference located at a short spatial distance of each secondary target. Corrections and filtering were deduced for each cell in the multi-colour space. We applied the technique to two different datasets: on the one hand, the spectrophotometric catalogue, and, on the other hand, a catalogue of extinctions based on photometry of Gaia eDR3 and 2MASS. After calibration, the dispersion of the extinction among neighbouring points in the second catalogue is reduced, regardless of whether reference targets are present locally. Weak structures are then more apparent. The extinction of high Galactic latitude targets is more tightly correlated with the dust emission, a property acquired from the first catalogue. A hierarchical inversion technique was applied to the two merged inter-calibrated catalogues to produce 3D extinction density maps corresponding to different volumes and maximum spatial resolution. The maximum resolution is 10pc for a 3000x3000x800pc3 volume around the Sun, and the maximum size of the maps is 10x10x0.8 kpc3 for a resolution of 50pc. Maps can be downloaded or used by means of on-line tools.