Cygnus-X Catalog

The Cygnus-X project is a Cycle 4 Legacy program (PID 40184) on the Spitzer Space Telescope. The survey imaged a ~24 square degree region centered near 20:30:25, +40:00 (J2000) with IRAC and the MIPS 24 micron band. Two catalog data products are provided, the Catalog and the Archive. The Catalog has more stringent constraints on S/N and detections in multiple bands, so in principle it is more reliable than the Archive. However, the lists differ mostly in the sources included at the faint end, including more sources that satisfy the S/N criterion in both IRAC 3.6 and 4.5 m bands. A detailed comparison between the Archive sources and the mosaics indicates that most of the sources are likely real, but a conservative estimate of the S/N has pushed them slightly outside of the requirement for inclusion in the Catalog. 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.

天鹅座-X（Cygnus-X）项目是斯皮策太空望远镜（Spitzer Space Telescope）的第4轮遗产计划（Cycle 4 Legacy program），项目编号（PID）为40184。该巡天项目采用IRAC与MIPS 24微米波段，对以J2000坐标系下20:30:25、+40:00附近为中心的约24平方度天区完成成像观测。本数据集提供两类目录数据产品：主目录（Catalog）与存档目录（Archive）。主目录对信噪比（S/N）及多波段探测设置了更为严苛的限制，理论上其可靠性优于存档目录。不过两类目录的差异主要体现在暗弱源的收录范围上，存档目录包含了更多同时满足IRAC 3.6与4.5微米波段信噪比判据的天体源。通过对存档目录源与拼接图像的详细比对可知，绝大多数源均为真实天体，但因采用保守的信噪比估算方式，这些源略微超出了主目录的收录标准。本数据集及相关服务由IPAC下属的红外科学档案馆（Infrared Science Archive, IRSA）提供，IPAC由加州理工学院根据与美国国家航空航天局（NASA）的合同运营。

搜集汇总

背景与挑战

背景概述

Cygnus-X Catalog是基于Spitzer太空望远镜观测数据的星表数据集，包含两个版本：高可靠性的Catalog和包含更多微弱源的Archive，覆盖约24平方度的天区，主要关注3.6和4.5微米波段的红外数据。