论文标题
Fedred I：贝叶斯反卷积的3D灭绝和恒星地图
FEDReD I: 3D extinction and stellar maps by Bayesian deconvolution
论文作者
论文摘要
语境。尽管Gaia可以详细探究扩展的当地邻域，但较大距离的薄磁盘结构仍然很少探索。 目标。我们的目的是在这里构建薄盘结构的非参数3D模型，同时处理灭绝和恒星密度。 方法。我们在两个维度上开发了一种贝叶斯反卷积方法：灭绝和距离。它使用完整信息定义选择功能的参考目录。它的设计使得可以添加来自其他目录的任何互补信息。它也被设计为对离群值的强大，在拥挤的领域中频繁进行，并且差异差异。先前的信息被设计为最小值：仅参考H-R图。我们为此得出了使用Gaia DR2数据的薄磁盘的经验H-R图，也可以使用基于合成的H-R图。 结果。我们使用GAIA DR2光度法和视差互补的2个MASS和UKIDS数据验证了模拟和真实领域的方法。我们详细介绍了两个测试场的结果：一个围绕NGC 4815开放群集的2个质量场，该群集在群集距离处显示出灭绝和恒星密度的过度密度，而在$ l = 10^{\ circ} $的Ukidss字段中，我们恢复了银河杆的位置。
Context. While Gaia enables to probe in great detail the extended local neighbourhood, the thin disk structure at larger distances remains sparsely explored. Aims. We aim here to build a non-parametric 3D model of the thin disc structures handling both the extinction and the stellar density simultaneously. Methods. We developed a Bayesian deconvolution method in two dimensions: extinction and distance. It uses a reference catalogue which completeness information defines the selection function. It is designed so that any complementary information from other catalogues can be added. It has also been designed to be robust to outliers, frequent in crowded fields, and differential extinction. The prior information is designed to be minimal: only a reference H-R diagram. We derived for this an empirical H-R diagram of the thin disk using Gaia DR2 data and synthetic isochrone-based H-R diagrams can also be used. Results. We validated the method on simulations and real fields using 2MASS and UKIDSS data complemented by Gaia DR2 photometry and parallaxes. We detail the results of two test fields: a 2MASS field centred around the NGC 4815 open cluster which shows an over-density of both extinction and stellar density at the cluster distance, and a UKIDSS field at $l=10^{\circ}$ where we recover the position of the Galactic bar.
