862 citations · 1k across the 18 of their papers we have counts for
9 papers · 1 filter
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…
The Distances to Molecular Clouds at High Galactic Latitudes based on GAIA DR2
Qing-Zeng Yan, Bo Zhang, Ye Xu +4
We report the distances of molecular clouds at high Galactic latitudes (|b|>10) derived from parallax and G band extinction (A) measurements in the second Gaia da…
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…
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…
Improved Selection Criteria for HII Regions, based on IRAS Sources
Qing-Zeng Yan, Ye Xu, A. J. Walsh +6
We present new criteria for selecting HII regions from the Infrared Astronomical Satellite (IRAS) Point Source catalogue (PSC), based on an HII region catalogue derived manually fr…
Towards a three-dimensional distribution of the molecular clouds in the Galactic Centre
Qing-Zeng Yan, A. J. Walsh, J. R. Dawson +8
We present a study of the three-dimensional structure of the molecular clouds in the Galactic Centre (GC) using CO emission and OH absorption lines. Two CO isotopologue lines, $^{1…
Molecular Lines of 13 Galactic Infrared Bubble Regions
Qing-zeng Yan, Ye Xu, Bo Zhang +3
We investigated the physical properties of molecular clouds and star formation processes around infrared bubbles which are essentially expanding HII regions. We performed observati…
The First Data Release (DR1) of the LAMOST general survey
A. -L. Luo, Y. -H. Zhao, G. Zhao +140
The Large sky Area Multi-Object Spectroscopic Telescope (LAMOST) General Survey is a spectroscopic survey that will eventually cover approximately half of the celestial sphere and…
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…