200 citations · 394 across the 21 of their papers we have counts for
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Strange Quasar Candidates with Abnormal Astrometric Characteristics from Gaia EDR3 and SDSS (SQUAB-II): Optical Identifications
Xiang Ji, Zhen-Ya Zheng, Qiqi Wu +7
There are some strange quasars with multiple Gaia detections or observed with abnormal astrometric characteristics, such as with large proper motions or significant astrometric noi…
SQUAB I: The first release of Strange QUasar candidates with ABnormal astrometric characteristics from Gaia EDR3 and SDSS
Qi-Qi Wu, Shi-Long Liao, Xiang Ji +4
Given their extremely large distances and small apparent sizes, quasars are generally considered as objects with near-zero parallax and proper motion. However, some special quasars…
A catalog of quasar candidates identified by astrometric and mid-infrared methods in Gaia EDR3
Qiqi Wu, Shilong Liao, Zhaoxiang Qi +3
Quasars are very important in materializing the reference frame. The excess emission of AGNs (active galactic nuclei) in the mid infrared band can be used to identify quasar candid…
Identifying quasars with astrometric and mid-infrared methods from APOP and ALLWISE
Sufen Guo, Zhaoxiang Qi, Shilong Liao +5
Context. Quasars are spatially stationary, and they are essential objects in astrometry when defining reference frames. However, the census of quasars is far from complete. Mid-inf…
A compilation of known QSOs for the Gaia mission
Shi-long Liao, Zhao-xiang Qi, Su-fen Guo +1
Quasars are essential for astrometric in the sense that they are spatial stationary because of their large distance from the Sun. The European Space Agency (ESA) space astrometric…
The properties of the quasars astrometric solution in Gaia DR2
Shilong Liao, Beatric Bucciarelli, Zhaoxiang Qi +3
Gaia data release 2 (DR2) provides the best non-rotating optical frame aligned with the radio frame (ICRF) thanks to the inclusion of about half-million quasars in the 5-parameter…
The LAMOST Survey of Background Quasars in the Vicinity of the Andromeda and Triangulum Galaxies -- II. Results from the Commissioning Observations and the Pilot Surveys
Zhi-Ying Huo, Xiao-Wei Liu, Mao-Sheng Xiang +68
We present new quasars discovered in the vicinity of the Andromeda and Triangulum galaxies with the LAMOST during the 2010 and 2011 observational seasons. Quasar candidates are sel…