文章基本信息

标题：A Mock Catalog of Gravitationally-lensed Quasars for the LSST Survey
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作者：Minghao Yue ; Xiaohui Fan ; Jinyi Yang 等
期刊名称：The Astronomical journal
印刷版ISSN：0004-6256
电子版ISSN：1538-3881
出版年度：2022
卷号：163
期号：3
页码：1-13
DOI：10.3847/1538-3881/ac4cb0
语种：English
出版社：American Institute of Physics
摘要：We present a mock catalog of gravitationally-lensed quasars at zqso < 7.5 with simulated images for the Rubin Observatory Legacy Survey of Space and Time (LSST). We adopt recent measurements of quasar-luminosity functions to model the quasar population, and use the CosmoDC2 mock galaxy catalog to model the deflector galaxies, which successfully reproduces the observed galaxy-velocity dispersion functions up to zd ∼ 1.5. The mock catalog is highly complete for lensed quasars with Einstein radius θE > 007 and quasar absolute magnitude Mi < − 20. We estimate that there are ∼103 lensed quasars discoverable in current imaging surveys, and LSST will increase this number to ∼ 2.4 × 103. Most of the lensed quasars have image separation Δθ > 05, which will at least be marginally resolved in LSST images with seeing of ∼07. There will be ∼200 quadruply-lensed quasars discoverable in the LSST. The fraction of quad lenses among all discoverable lensed quasars is about ∼10%–15%, and this fraction decreases with survey depth. This mock catalog shows a large diversity in the observational features of lensed quasars, in terms of lensing separation and quasar-to-deflector flux ratio. We discuss possible strategies for a complete search of lensed quasars in the LSST era.