Southern HII Region Discovery Survey (SHRDS): Dataset 4

The Southern HII Region Discovery Survey is an Australia Telescope Compact Array 4-6 and 8-10 GHz radio continuum and radio recombination line survey of Milky Way HII regions (Wenger et al., 2021). This data archive contains all relevant intermediate data products from the final SHRDS data release (the Full Catalog). For each observed HII region and calibrator field, this archive contains (1) a 4 GHz bandwidth, full-Stokes, multi-scale, multi-frequency synthesis (MS-MFS) continuum FITS image, (2) up to sixteen 256 MHz bandwidth, full-Stokes, MS-MFS continuum FITS images covering the full 4 GHz bandwidth, (3) a Stokes I MS-MFS FITS image of each RRL transition, (4) a Stokes I multi-scale FITS data cube of each RRL transition, and (5) a FITS image containing the watershed segmentation region for each identified HII region at each observed frequency. The archive also includes the relevant residual images/cubes and primary beam images for all of these data products, as well as all of the images and cubes smoothed to a common angular resolution.

南部电离氢区（HII Region）发现巡天（Southern HII Region Discovery Survey, SHRDS）是依托澳大利亚望远镜紧凑阵列（Australia Telescope Compact Array, ATCA）开展的银河系电离氢区射电连续谱与射电复合线巡天，观测频段覆盖4-6 GHz与8-10 GHz（Wenger等人，2021）。本数据档案库包含SHRDS最终数据发布版本（全星表，Full Catalog）的所有相关中间数据产物。针对每一个观测到的电离氢区与校准场，本档案库包含以下数据产物：(1) 带宽4 GHz、全斯托克斯（full-Stokes）参数、多尺度多频率合成（MS-MFS）的射电连续谱FITS图像；(2) 最多16张带宽256 MHz、全斯托克斯参数、采用MS-MFS处理的射电连续谱FITS图像，覆盖完整的4 GHz观测带宽；(3) 每一条射电复合线（Radio Recombination Line, RRL）跃迁对应的斯托克斯I（Stokes I）MS-MFS FITS图像；(4) 每一条RRL跃迁对应的斯托克斯I多尺度FITS数据立方体；(5) 对应每个观测频段、每一个已识别电离氢区的分水岭分割区域FITS图像。本档案库还包含所有上述数据产物对应的残差图像/数据立方体与主波束图像，同时包含所有经平滑处理至统一角分辨率的图像与数据立方体。