130 citations · 488 across the 16 of their papers we have counts for
14 papers
Multiple HCN line observations towards 19 Galactic massive star-forming regions
Huanxue Feng, Junzhi Wang, Shanghuo Li +5
We performed observations of the HCN (24-23, 17-16, 11-10, 8-7) lines towards a sample consisting of 19 Galactic massive star-forming regions with the Arizona Radio Observatory…
High-redshift Extreme Variability Quasars from Sloan Digital Sky Survey Multi-Epoch Spectroscopy
Hengxiao Guo, Jiacheng Peng, Kaiwen Zhang +9
We perform a systematic search for high-redshift ( 1.5) extreme variability quasars (EVQs) using repeat spectra from the Sixteenth Data Release of Sloan Digital Sky Survey, wh…
Discovery of A Mg II Changing-look AGN and its Implications for a Unification Sequence of Changing-look AGNs
Hengxiao Guo, Mouyuan Sun, Xin Liu +5
Changing-Look (CL) is a rare phenomenon of Active Galactic Nuclei (AGNs) that exhibit emerging or disappearing broad lines accompanied by continuum variations on astrophysically sh…
A Trio of Massive Black Holes Caught in the Act of Merging
Xin Liu, Meicun Hou, Zhiyuan Li +6
We report the discovery of SDSS J0849+1114 as the first known triple Type 2 Seyfert nucleus. It represents three active black holes that are identified from new spatially resolved…
Understanding Broad Mg II Variability in Quasars with Photoionization: Implications for Reverberation Mapping and Changing-Look Quasars
Hengxiao Guo, Yue Shen, Zhicheng He +7
The broad Mg II line in quasars has distinct variability properties compared with broad Balmer lines: it is less variable, and usually does not display a "breathing" mode, the incr…
Low-mass and High-mass Supermassive Blackholes In Radio-Loud AGNs Are Spun-up in Different Evolution Paths
J. Wang, M. Z. Kong, S. F. Liu +3
How Supermassive Blackholes (SMBHs) are spun-up is a key issue of modern astrophysics. As an extension of the study in Wang et al. (2016), we here address the issue by comparing th…