标题： WFPC2档案平行项目 显示英文标题

标题： The WFPC2 Archival Parallels Project

摘要： 我们描述了为获得哈勃望远镜WFPC2（广域和行星相机2）存档纯平行计划中获取的图像的近自动组合而开发的方法和程序。已经开发或改进了几种技术，以确保在不同时间和不同方向上获取的重叠图像能够正确对齐、配准和组合。我们量化了不同类型图像配准的成功率和准确性，并开发了适合在不影响扩展发射的情况下平衡天空背景的技术。已经有大约600张组合图像通过STScI档案馆向公众发布，这些图像是计划中的1500张图像的一部分。迄今为止发布的图像特别适用于研究麦哲伦云中的恒星形成、附近星系晕中的恒星群体以及$ z \sim 3 $处恒星形成星系的特性。 显示英文摘要

摘要： We describe the methods and procedures developed to obtain a near-automatic combination of WFPC2 images obtained as part of the WFPC2 Archival Pure Parallels program. Several techniques have been developed or refined to ensure proper alignment, registration, and combination of overlapping images that can be obtained at different times and with different orientations. We quantify the success rate and the accuracy of the registration of images of different types, and we develop techniques suitable to equalize the sky background without unduly affecting extended emission. About 600 combined images of the 1,500 eventually planned have already been publicly released through the STScI Archive. The images released to date are especially suited to study star formation in the Magellanic Clouds, the stellar population in the halo of nearby galaxies, and the properties of star-forming galaxies at $ z \sim 3 $.