H-ATLAS：科学演示阶段的PACS成像
H-ATLAS: PACS imaging for the Science Demonstration Phase
摘要：
我们描述了在Herschel-ATLAS（H-ATLAS）巡天的科学演示阶段中，使用赫歇尔空间天文台上的PACS仪器采集的数据的简化，特别是使用Herschel的快速扫描（60 arcsec/s）并行模式获得的4x 4度区域的数据。我们详细描述了一个管道的数据减少HIPE从数据检索到生产科学质量的图像使用定制的程序。我们发现，消除宇宙射线毛刺的标准程序也消除了部分亮源，因此实施了有效的两阶段过程，以最大限度地减少这些问题。使用100和160 um的3.4和2.5弧分矩形波高通滤波器从时间线中去除明显的1/f噪声。经验测量的点扩散函数（PSF）被用来确定包围的能量分数作为孔径大小的函数。对于100-和160-um波段，有效PSF为~9和~13弧秒（FWHM），90%环绕能量半径为13和18弧秒。天体测量精度好到~<2角秒。最终地图中的噪声在相邻像素之间是相关的，并且比发布之前宣传的要高。对于一对交叉扫描，对于100 μ m处的9-13弧秒半径孔径，5-sigma点源灵敏度为125-165 mJy，对于160 μ m处的13-18弧秒半径孔径，5-sigma点源灵敏度为150-240 mJy。
英文摘要：
We describe the reduction of data taken with the PACS instrument on board the Herschel Space Observatory in the Science Demonstration Phase of the Herschel-ATLAS (H-ATLAS) survey, specifically data obtained for a 4x4-deg^2 region using Herschel's fast-scan (60 arcsec/s) parallel mode. We describe in detail a pipeline for data reduction using customised procedures within HIPE from data retrieval to the production of science-quality images. We found that the standard procedure for removing Cosmic-Ray glitches also removed parts of bright sources and so implemented an effective two-stage process to minimise these problems. The pronounced 1/f noise is removed from the timelines using 3.4- and 2.5-arcmin boxcar high-pass filters at 100 and 160-um. Empirical measurements of the point-spread function (PSF) are used to determine the encircled energy fraction as a function of aperture size. For the 100- and 160-um bands, the effective PSFs are ~9 and ~13 arcsec (FWHM), and the 90-per-cent encircled energy radii are 13 and 18 arcsec. Astrometric accuracy is good to ~<2 arcsec. The noise in the final maps is correlated between neighbouring pixels and rather higher than advertised prior to launch. For a pair of cross-scans, the 5-sigma point-source sensitivities are 125-165 mJy for 9-13-arcsec radius apertures at 100-um and 150-240 mJy for 13-18-arcsec radius apertures at 160-um.
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