GMS25 2D and 3D interstellar extinction maps and estimates for celestial objects

We present a new two-dimensional (2D) map of total Galactic extinction Av across the entire dust half-layer from the Sun to extragalactic space for Galactic latitudes |b|>13 deg, three-dimensional (3D) map of Av within 2 kpc of the Sun and corresponding extinction estimates for galaxies, quasars, SN Ia, globular clusters, open clusters, and dust clouds. These maps and estimates are described by George Gontcharov et al. 2025 in a paper published in Research in Astronomy and Astrophysics. The 2D map contains 3,991,111 rows =cells in the sky as one file final2Dall.txt (Table 1 of our paper), while the 3D map contains 87,985,878 rows =spatial bins over the sky presented in many files, such as final3D__SGP_177.txt, ..., final3D_1595_NGP.txt sliced by Galactic latitude (Table 2 of our paper). The format of the tables is described in the paper. The map estimates are provided for various classes of extended celestial objects with angular size primarily in the range of 2-40 arcmin, including 19,809 galaxies and quasars (Table 3 of the paper), 8,293 Type Ia supernovae (Table 4 of the paper), 170 Galactic globular clusters 9Table 5 of the paper), 458 open clusters (Table 6 of the paper), and several hundreds molecular clouds from two lists (Tables 7 and 8 of the paper).

本研究构建了银道纬度|b|>13°范围内、覆盖从太阳至河外空间完整尘埃半层的总银河消光（total Galactic extinction, 记为Av）二维（2D）分布图，同时构建了太阳2千秒差距（kpc）范围内的Av三维（3D）分布图，以及针对星系、类星体、Ia型超新星（SN Ia）、球状星团、疏散星团与尘埃云的对应消光估算值。上述分布图与估算值由George Gontcharov等人于2025年发表于《Research in Astronomy and Astrophysics》（《天文与天体物理研究》）的论文中详细阐述。本次发布的二维分布图以单个文件final2Dall.txt存储，包含3,991,111个天区单元格，对应论文表1；三维分布图则包含87,985,878个天区空间分箱，按银道纬度切片存储于多个文件中，例如final3D__SGP_177.txt、final3D_1595_NGP.txt等，对应论文表2。表格的具体格式详见该论文。本次估算覆盖角尺寸主要介于2至40角分（arcmin）的各类延展天体，其中包含19,809个星系与类星体（对应论文表3）、8,293颗Ia型超新星（对应论文表4）、170个银河球状星团（对应论文表5）、458个疏散星团（对应论文表6），以及来自两份列表的数百个分子云（对应论文表7与表8）。