钱德拉透镜星系团超深河外巡天（CLUES）I：Abell 2744 天区 2 Ms 点源星表

中文摘要 AI 辅助

在钱德拉透镜星系团超深河外巡天（CLUES）的第一篇论文中，我们展示了由101次钱德拉ACIS-I观测构建的Abell 2744天区2 Ms超深X射线巡天。该天区的曝光时间与钱德拉深场相当，并得益于Abell 2744星系团（红移$z=0.3$）的强引力透镜放大效应，使其成为天空中第三深的河外X射线巡天，同时与哈勃空间望远镜和詹姆斯·韦布空间望远镜的广泛覆盖形成了丰富的协同观测。我们介绍了钱德拉数据处理过程，并在软（0.5-2 keV）、硬（2-7 keV）和全（0.5-7 keV）波段内，于总面积$369~\mathrm{arcmin^2}$的天区中探测源。我们利用钱德拉点扩散函数进行专门的图像拟合，以优化点源探测并改进X射线位置，并进一步筛选探测结果以处理中心明亮、结构化的星系团内介质的影响。共探测并编目了327个X射线点源，包括其X射线测光数据和基本光谱性质。我们还进行了详细的模拟，基于模拟结果，在全、软和硬波段中，预期的50%流量完备性分别达到$6.3\times10^{-16}$、$2.8\times10^{-16}$和$4.9\times10^{-16}~\mathrm{erg~cm^{-2}~s^{-1}}$。源数密度随流量的变化与空白场巡天在约2倍因子内一致，在约$10^{-14}~\mathrm{erg~cm^{-2}~s^{-1}}$以上略有超出。所有X射线数据产品均已公开释放，包括星表、X射线图像、曝光图、背景图和灵敏度图。

英文摘要

In the first paper of the Chandra Lensing-cluster Ultradeep Extragalactic Survey (CLUES), we present an ultradeep 2 Ms X-ray survey of the Abell 2744 field constructed from 101 archival Chandra ACIS-I observations. With an exposure comparable to the Chandra Deep Fields and further boosted by strong-lensing magnification from the Abell 2744 cluster at $z=0.3$, this field represents the third deepest extragalactic X-ray survey of the sky and also has rich synergy with extensive coverage by the Hubble Space Telescope and James Webb Space Telescope. We present the Chandra data reduction and detect sources in the soft (0.5-2 keV), hard (2-7 keV), and full (0.5-7 keV) bands over a total area of $369~\mathrm{arcmin^2}$. We perform dedicated image fitting with Chandra point spread functions to optimize point-source detections and improve X-ray positions and further screen the detections to address the impact of the central bright, structured intracluster medium. A total of 327 X-ray point sources are detected and cataloged, including their X-ray photometry and basic spectral properties. Detailed simulations are also conducted, based on which the expected 50% flux completeness reaches $6.3\times10^{-16}$, $2.8\times10^{-16}$, and $4.9\times10^{-16}~\mathrm{erg~cm^{-2}~s^{-1}}$ in the full, soft, and hard bands, respectively. The source number density as a function of flux is consistent with those in blank-field surveys within a factor of $\approx2$, with a slight excess above $\approx10^{-14}~\mathrm{erg~cm^{-2}~s^{-1}}$. All X-ray data products are publicly released, including the catalog, X-ray images, exposure maps, background maps, and sensitivity maps.

发表机构

• Peking University（北京大学）
• Kavli Institute for Astronomy and Astrophysics, Peking University（北京大学科维理天文与天体物理研究所）
• University of Michigan（密歇根大学）
• Nanjing University（南京大学）
• The Pennsylvania State University（宾夕法尼亚州立大学）
• Institute for Gravitation and the Cosmos, The Pennsylvania State University（宾夕法尼亚州立大学引力与宇宙学研究所）

机构由 AI 辅助整理，请以论文原文为准。

补充信息

备注

27 pages, 16 figures, 3 tables, submitted