5 papers · 1 filter
Testing Colour-magnitude Pattern as A Method in the Search for Changing-Look AGNs
Li-tao Zhu, Zhongxiang Wang, P. U. Devanand +6
We develop a simple method to search for changing-look (CL) active galactic nucleus (AGN) candidates, and conduct a test run. In this method, optical variations of AGNs are monitor…
PKS~2332017 and PMN J19161519: Candidate Blazar Counterparts to Two High-energy Neutrino Events
Shunhao Ji, Zhongxiang Wang, Dong Zheng
We report our counterpart identification study for two high-energy neutrino events IC-130127A and IC-131204A listed in the IceCube Event Catalog of Alert Tracks. These two events b…
PKS 2254+074: A Blazar in Likely Association with the Neutrino Event IceCube-190619A
Shunhao Ji, Zhongxiang Wang
We report our study of the field of a 0.2 PeV neutrino event IC-190619A. This neutrino belongs to Gold events, which more likely have an astrophysical origin. Among the two…
Fermi Blazars in the Zwicky Transient Facility Survey: Properties of Large Optical Variations
Si-Si Sun, Zhongxiang Wang, Shun-hao Ji
We analyze the optical light-curve data, obtained with the Zwicky Transient Facility (ZTF) survey, for 47 gamma-ray blazars monitored by the Large Area Telescope onboard {\it the F…
Identifying Three New AGNs Among Fermi Unidentified Gigaelectronvolt Sources
Shunhao Ji, Zhongxiang Wang, Qiangmeng Huang +1
We report our identification of three gigaelectronvolt -ray sources, 4FGL J0502.6+0036, 4FGL J1055.9+6507, and 4FGL J1708.2+5519, as Active Galactic Nuclei (AGNs). They are list…