553 citations · 802 across the 17 of their papers we have counts for
6 papers · 1 filter
Comparison of dynamical and kinematic reference frames via pulsar positions from timing, Gaia, and interferometric astrometry
Niu Liu, Zi Zhu, John Antoniadis +3
Pulsars are special objects whose positions can be determined independently from timing, radio interferometric, and Gaia astrometry at sub-milliarcsecond (mas) precision; thus, the…
Evaluate the ICRF3 axes stability via extragalactic source position time series
Niu Liu, Sebastien Lambert, Felicitas Arias +2
We present an updated study on assessing the axes stability of the third generation of the International Celestial Reference Frame (ICRF3) in terms of linear drift and scatter base…
Evaluation of the ICRF stability from position time series analysis
Niu Liu, Sebastien Lambert, Felicitas Arias +2
The celestial reference frame is realized by absolute positions of extragalactic sources that are assumed to be fixed in the space. The fixing of the axes is one of the crucial poi…
Comparison of multifrequency positions of extragalactic sources from global geodetic VLBI monitoring program and Gaia EDR3
Niu Liu, Sebastien Lambert, Patrick Charlot +5
We extend previous works by considering two additional radio frequencies (K band and X/Ka band) with the aim to study the frequency dependence of the source positions and its poten…
Systematics and accuracy of VLBI astrometry: What can be learned from a comparison with Gaia Data Release 2
Niu Liu, Sebastien Lambert, Zi Zhu +1
We aim to investigate the overall properties of the ICRF3 with the help of the Gaia Data release 2 (Gaia DR2). This could serve as an external check of the quality of the ICRF3. Th…
An Algorithm for Preferential Selection of Spectroscopic Targets in LEGUE
Jeffrey L. Carlin, Sebastien Lepine, Heidi Jo Newberg +22
We describe a general target selection algorithm that is applicable to any survey in which the number of available candidates is much larger than the number of objects to be observ…