A Catalog of 13CO Clumps from the MWISP in l=10°–20°

In this study, we present a catalog of molecular clumps extracted from 13CO (J = 1 − 0) emission data of the Milky Way Imaging Scroll Painting (MWISP) project. The data covers the inner Milky Way within the longitude range 10° < l < 20° and the latitude strip of |b| < 5°.25.The catalog comprising 18,757 molecular clumps was obtained using Facet-SS-3D-Clump, and thecatalog is 90% complete above 37 K km s−1.In the table, columns (2) and (3) are the positions of the clumps in galactic coordinates, and column (4) is the central radial velocity with respect to the local standard of rest (LSR). Columns (5) and (6) represent the major and minor sizes of the fitted ellipse on the sky plane, respectively. Column (7) represents the FWHM size in the velocity direction. Column (8) is the tilt angle on the sky plane, calculated from the north Galactic pole to the major axis of the clump in the counter-clockwise direction. Columns (9) and (10) list the clump’s peak intensity and total integrated intensity value, respectively. Column (11) represents the peak signal-to-noise ratio (S/N) of the clump. Column (12) is the fitting error, which is calculated by the rms error between the fitting value and the actual value. Column (13) is theconfidence levels associated with the clumps, which are verified by SS-3D-Clump.

本研究基于银河系成像卷轴绘图（Milky Way Imaging Scroll Painting, MWISP）项目的13CO（J=1−0）发射数据，提取得到一份分子团块目录。该数据覆盖银经范围10°<l<20°、银纬|b|<5.25°的银河系内区。本目录共包含18757个分子团块，通过Facet-SS-3D-Clump算法提取得到，在37 K·km·s⁻¹以上的完整性达90%。表格各列信息说明如下：第2、3列分别为团块的银道坐标位置；第4列为相对于局部静止标准（Local Standard of Rest, LSR）的中心视向速度；第5、6列分别为天平面上拟合椭圆的长、短轴尺寸；第7列为速度方向的半高全宽（Full Width at Half Maximum, FWHM）尺寸；第8列为天平面上的倾角，以银河北极为起点，沿逆时针方向指向团块长轴进行度量；第9、10列分别为团块的峰值强度与总积分强度值；第11列为团块的峰值信噪比（Signal-to-Noise Ratio, S/N）；第12列为拟合误差，通过拟合值与实际值之间的均方根（Root Mean Square, RMS）误差计算得到；第13列为团块对应的置信度等级，该等级通过SS-3D-Clump算法验证得到。