An All-sky 3D Dust Map Based on Gaia and LAMOST

作者：Tao Wang, Haibo Yuan, Bingqiu Chen, Maosheng Xiang, Ruoyi Zhang, Bowen Huang, Hongrui Gu, Shuaicong 帅聪 Wang 王, Jiawei Li · 发表于：The Astrophysical Journal Supplement Series · 年份：2025 · DOI：10.3847/1538-4365/adea39 · 被引用次数：23 · 研究领域：Scientific Research and Discoveries、Stellar, planetary, and galactic studies、Gamma-ray bursts and supernovae

Abstract We present a comprehensive 3D dust-reddening map covering the entire Milky Way, constructed by combining reddening estimates based on Large Sky Area Multi-Object Fiber Spectroscopy Telescope (LAMOST) low-resolution spectra ( E ( B − V ) LAMOST ) with those derived from Gaia XP spectra ( E ( B − V ) XP ), along with revised Gaia distances. E ( B − V ) LAMOST values of ∼4.6 million unique sources were obtained with the standard-pair analysis using LAMOST DR11 stellar parameters and synthesized B- / V -band photometry from Gaia XP spectra, showing a typical precision of ∼0.01 mag. The E ( B − V ) XP from the catalog of X. Zhang et al., which was derived using forward modeling of Gaia XP spectra, were cross-validated with E ( B − V ) LAMOST , leading to the selection of ∼150 million high-reliability measurements. The combined data set achieves a median precision of ∼0.03 mag for E ( B − V ). To model the reddening–distance relationship along various lines of sight, we implemented a parametric approach that accounts for contributions from the Local Bubble, diffuse interstellar medium, and multiple potential molecular clouds. The sky was adaptively partitioned based on stellar density, resulting in angular resolutions ranging from 3 . ′ 4 to 58′, with about half of the sky having a resolution better than 6 . ′ 9. The reddening precision of our 3D map for individual stars reaches ∼0.01 mag in most regions at ∣ b ∣ > 20°, but degrades to 0.01–0.05 ...