论文标题
Fedred II：3D灭绝图2Mass和Gaia DR2数据
FEDReD II : 3D Extinction Map with 2MASS and Gaia DR2 data
论文作者
论文摘要
目标。我们的目的是绘制银河系盘的星际灭绝的3D分布，直至比单独使用Gaia视差探测的距离大。 方法。我们将FedRed（场灭绝距离关系deconvolver）算法应用于2MASS近红外光度法，以及GAIA DR2 ASTREVERINE和SHOTMOMETRY。该算法使用贝叶斯反卷积方法，基于局部薄磁盘代表的经验HR-DIAGR，以映射灭绝作为各种视野距离的函数。 结果。我们分析了超过560万星，以在$ | b | <0.24^{\ circ} $内获得整个银河磁盘的灭绝图。该地图在银河中心的方向上提供了最高$ 5〜 \ mathrm {kpc} $的信息，并以$ 7〜 \ mathrm {kpc} $的方向朝着Anticentre的方向上。该地图揭示了局部已知的结构的完整形状，例如Vela复合物或局部臂的分裂。此外，我们的灭绝图显示了许多大型的“干净气泡”，尤其是射手座中的一个 - Carina Complex，还有四个定义了我们昵称蝴蝶的结构。
Aims. We aim to map the 3D distribution of the interstellar extinction of the Milky Way disk up to distances larger than those probed with the Gaia parallax alone. Methods. We apply the FEDReD (Field Extinction-Distance Relation Deconvolver) algorithm to the 2MASS near-infrared photometry together with the Gaia DR2 astrometry and photometry. This algorithm uses a Bayesian deconvolution approach, based on an empirical HR-diagram representative of the local thin disk, in order to map the extinction as a function of distance of various fields of view. Results. We analysed more than 5.6 million stars to obtain an extinction map of the entire Galactic disk within $|b|<0.24^{\circ}$. This map provides information up to $5~\mathrm{kpc}$ in the direction of the Galactic centre and at more than $7~\mathrm{kpc}$ in the direction of the anticentre. This map reveals the complete shape of structures known locally, such as the Vela complex or the split of the local arm. Furthermore our extinction map shows many large "clean bubbles" especially one in the Sagittarius -- Carina complex, and four others which define a structure that we nickname the butterfly.
