Confirming HSC strong lens candidates with DESI spectroscopy. I. Project overview and first results

IF 7.5 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY
Yiping Shu, Shen Li
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引用次数: 0

Abstract

Accurate redshift determinations of both lenses and sources are critical for confirming strong-lens systems and fully realizing their scientific value. However, the thousands of strong-lens candidates now routinely discovered in wide-field imaging surveys make one-by-one follow-up observations impractical. In this work, we investigate the capability and efficiency of large-scale spectroscopic surveys in confirming strong-lens systems. As a case study, we cross-match strong lens candidates identified from the Hyper Suprime-Cam Subaru Strategic Program with Data Release 1 (DR1) of the Dark Energy Spectroscopic Instrument (DESI). We find that DESI DR1 serendipitously observed putative lenses and/or lensed images in approximately 50% of these candidates. Analyzing the DESI spectra for ≈ 500 matched candidates that meet our selection criteria, we determine both lens and source red-shifts for 27 systems. Additionally, 76 candidate systems feature lensing galaxies at z > 0:8, and one candidate system contains a quasar within its lensing galaxy. Applying this approach to other strong-lens candidates will yield many more confirmations, with a further several-fold increase anticipated from the final DESI data release. Our results highlight the growing importance of large-scale spectroscopic surveys in advancing strong lensing discoveries and science.

用DESI光谱确认HSC强透镜候选者。一、项目概况及初步成果
准确地确定透镜和光源的红移是确认强透镜系统和充分实现其科学价值的关键。然而,现在在宽视场成像调查中经常发现的数千个强透镜候选者使得逐一的后续观察变得不切实际。在这项工作中,我们研究了大规模光谱调查在确认强透镜系统中的能力和效率。作为案例研究,我们将从斯巴鲁超优摄像头战略计划中确定的强透镜候选物与暗能量光谱仪器(DESI)的数据发布1 (DR1)进行交叉匹配。我们发现DESI DR1在大约50%的候选者中偶然观察到假定的透镜和/或透镜图像。分析了约500个符合我们选择标准的匹配候选者的DESI光谱,我们确定了27个系统的透镜和源红移。此外,76个候选系统在z >; 0:8处具有透镜星系,其中一个候选系统在其透镜星系中包含一个类星体。将这种方法应用于其他强透镜候选者将产生更多的确认,预计最终DESI数据发布将进一步增加几倍。我们的结果强调了大规模光谱调查在推进强透镜发现和科学方面日益增长的重要性。
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来源期刊
Science China Physics, Mechanics & Astronomy
Science China Physics, Mechanics & Astronomy PHYSICS, MULTIDISCIPLINARY-
CiteScore
10.30
自引率
6.20%
发文量
4047
审稿时长
3 months
期刊介绍: Science China Physics, Mechanics & Astronomy, an academic journal cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China, and published by Science China Press, is committed to publishing high-quality, original results in both basic and applied research. Science China Physics, Mechanics & Astronomy, is published in both print and electronic forms. It is indexed by Science Citation Index. Categories of articles: Reviews summarize representative results and achievements in a particular topic or an area, comment on the current state of research, and advise on the research directions. The author’s own opinion and related discussion is requested. Research papers report on important original results in all areas of physics, mechanics and astronomy. Brief reports present short reports in a timely manner of the latest important results.
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