58 citations · 150 across the 15 of their papers we have counts for
3 papers · 1 filter
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…