Chandra Lensing-cluster Ultradeep Extragalactic Survey (CLUES) I: A 2 Ms Point-Source Catalog of the Abell 2744 Field
Abstract
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 arcmin2. 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 6.3×10−16, 2.8×10−16, and 4.9×10−16 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 ≈2, with a slight excess above ≈10−14 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.
Related
- The Chandra-Gaia Catalog of Counterparts: Resolving ambiguous Gaia matches to X-ray sources in the Chandra Source Catalog using Machine Learning
- Exploring the faint limit of the ESA Plato space mission. A case study of extragalactic research with the self-lensing supermassive black hole binary candidate, Spikey
- The extragalactic science of the KMOS VVVX-GalCen spectroscopic survey II: Discovery of a galaxy cluster at z = 0.089 behind the Galactic plane
- Euclid: Galaxy cluster detection through the weak lensing effect: Algorithm assessment and selection
- The Next Generation Virgo Cluster Survey (NGVS). II. A Catalog of Galaxies in the Virgo Cluster
BibTeX
@misc{wang2026chandra,
title = {{Chandra Lensing-cluster Ultradeep Extragalactic Survey (CLUES) I: A 2 Ms Point-Source Catalog of the Abell 2744 Field}},
author = {Shouyi Wang and Fan Zou and Elena Gallo and Bin Luo and W. N. Brandt and Yuxuan Pang and Tommaso Treu and Xue-Bing Wu and Dieu D. Nguyen and Guido Roberts-Borsani and Shengzhe Wang and Weiwei Xu and Zihao Zuo},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.17673},
eprint = {2609.17673},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.17673},
}
RIS
TY - UNPB
TI - Chandra Lensing-cluster Ultradeep Extragalactic Survey (CLUES) I: A 2 Ms Point-Source Catalog of the Abell 2744 Field
AU - Shouyi Wang
AU - Fan Zou
AU - Elena Gallo
AU - Bin Luo
AU - W. N. Brandt
AU - Yuxuan Pang
AU - Tommaso Treu
AU - Xue-Bing Wu
AU - Dieu D. Nguyen
AU - Guido Roberts-Borsani
AU - Shengzhe Wang
AU - Weiwei Xu
AU - Zihao Zuo
PY - 2026
DA - 2026/09/15
PB - arXiv
DO - 10.48550/arxiv.2609.17673
UR - https://arxiv.org/abs/2609.17673
AB - 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 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 6.3×10^−16, 2.8×10^−16, and 4.9×10^−16 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 ≈2, with a slight excess above ≈10^−14 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.
ER -