Candidate cluster-scale gravitationally lensed quasars from CluMPR and DESI Legacy Survey

Candidate cluster-scale strongly-lensed quasars from DESI Legacy Survey (DESI QSO targets) and CluMPR DESI Legacy Survey galaxy cluster catalog. Paper decribing the CluMPR galaxy cluster catalogs and candidate lensed quasar catalogs: The CluMPR Galaxy Cluster-Finding Algorithm and DESI Legacy Survey Galaxy Cluster catalogue (M. J. Yantovski-Barth et al.) Description: To search for lensed quasars, we use two Einstein radii: one corresponds to wide angle lensing by the entire cluster (𝑀 = 10^15 𝑀⊙ ), and the other corresponds to lensing by the core of the cluster (𝑀 = 0.25 ∗ 10^15 𝑀⊙ ). We use the colors in bands g-r, g-z, and r-W1 to evaluate candidate lensed quasars. If at least two quasars are within 1 magnitude of each other in all 3 colors, we rate the candidate at Grade C. If at least three quasars are within 1 magnitude of each other in all 3 colors, we rate the the candidate at Grade B. If either 4 quasars or two combinations of 3 quasars are within 1 magnitude of each other in all 3 colors, we rate the candidate as Grade A.本数据集为团尺度强引力透镜类星体候选体集合，数据来源于DESI Legacy巡天（DESI Legacy Survey，其观测目标为DESI类星体（Quasi-Stellar Object, QSO）目标）以及CluMPR DESI Legacy巡天星系团目录。用于阐述CluMPR星系团目录与候选透镜类星体目录的学术论文为：《CluMPR星系团搜寻算法与DESI Legacy巡天星系团目录》（M. J. Yantovski-Barth等）。为搜寻引力透镜类星体，本研究采用两类爱因斯坦半径：其一对应整个星系团的广角引力透镜效应，透镜质量𝑀 = 10^15 𝑀⊙（𝑀⊙为太阳质量）；其二对应星系团核心的引力透镜效应，透镜质量𝑀 = 0.25 × 10^15 𝑀⊙。我们通过g-r、g-z及r-W1三个波段的颜色特征对候选透镜类星体进行筛选：若至少2颗类星体在全部3个颜色波段内的星等差均不超过1等，则将该候选体评为C级；若至少3颗类星体满足上述星等差条件，则评为B级；若存在4颗类星体，或存在2组符合该星等差要求的3颗类星体组合，则将候选体评为A级。