Herschel PACS Point Source Catalog: Observation Table

To maximize the science return of the PACS data sets, a homogeneous Herschel/PACS Point Source Catalogue (HPPSC) was constructed from all the scan map observations. The catalogue enables a systematic and unbiased comparison of sensitivity across different Herschel fields that single programs will generally not be able to provide.

The Observation Table reports the main parameters that characterize the maps on which the source extraction was performed. Most of them correspond to Meta-keywords of the Observational Context. The level parameter states which map level was adopted for every map and the nobsids parameter specifies how many observations (obsID) contribute to the generation of the map. The obsid parameter always refers to the first observation identifier into the Observational Context (obsid001) and, for every obsid value, there are two entries in the table, corresponding to the two filters adopted. For more information, see the Explanatory Supplement.

This dataset or service is made available by the Infrared Science Archive (IRSA) at IPAC, which is operated by the California Institute of Technology under contract with the National Aeronautics and Space Administration.

为最大化PACS数据集的科学产出，研究团队基于全部扫描绘图观测数据构建了均质化的赫歇尔/PACS点源目录（Herschel/PACS Point Source Catalogue，HPPSC）。该目录支持对不同赫歇尔观测天区的灵敏度开展系统性、无偏对比分析，而单一观测项目通常难以实现此类分析。

观测表列出了用于点源提取的绘图的核心表征参数，其中绝大多数参数对应于观测上下文的元关键字。level参数用于指明每张绘图所采用的绘图层级，nobsids参数则指定了参与该绘图生成的观测数目（obsID）。obsid参数始终指向观测上下文中的首个观测标识符（obsid001）；针对每个obsid取值，表中均存在两条记录，分别对应所采用的两个滤光片。如需更多详细信息，请参阅解释性补充文档（Explanatory Supplement）。

本数据集或服务由IPAC下属的红外科学档案馆（Infrared Science Archive，IRSA）提供，该机构由加州理工学院根据与美国国家航空航天局签订的合同运营。