16 papers
Galaxy-LRD Strong Lenses: A Missing Population?
Zizhao He, Nan Li, Simon Dye +2
The physical nature of Little Red Dots (LRDs) remains uncertain, although these abundant, compact, and red sources may offer important insights into early black-hole growth and gal…
Search for Quasar Pairs with Astrometric Data. III. Discovery of 9 dual and projected quasars
Qihang Chen, Zizhao He, Zhuojun Deng +3
We report the low-resolution long-slit spectroscopic observations and confirmations of 11 quasar pair candidates, which are selected from the MGQPC catalog presented in the first p…
New Dynamical Measurements from a Lensed Quasar Sample: Joint Analysis Constrains the Mass Profile Evolution of Lens Galaxies
Ziyu Guo, Yun Chen, Yiping Shu +4
We present a systematic study of the internal mass structure of early-type galaxies (ETGs) based on 106 galaxy-scale strong gravitational lenses with background quasars, all having…
Discovery of a Strong-lens Galaxy Pair with the Smallest Projected Separation
Zizhao He, Limeng Deng, Qihang Chen +3
We present the spectroscopic confirmation and lens modeling of HSC~J02330205, a strong-lensing system produced by a close pair of elliptical galaxies at that…
CURLING -- III. Identifying Candidates of Wide-separation Gravitationally Lensed Quasars from the CatNorth Catalogue
Di Wu, Zizhao He, Nan Li +5
Wide-separation lensed quasars (WSLQs) are a rare subclass of strongly lensed quasars produced by massive galaxy clusters. They provide valuable probes of dark-matter halos and qua…
Search for Quasar Pairs with Astrometric Data. I. Method and Candidates
Qihang Chen, Liang Jing, Xingyu Zhu +5
Quasar pairs, a special subclass of galaxy pairs, are valuable in the investigation of quasar interaction, clustering, co-evolution between the two quasars' host galaxies, the grow…