The study of blazar jet has been performed for several decades via VLBI technique, while its
generation and propagation stay unclear. In the present work, we compiled a sample of 407 …

The question of radio dichotomy in active galactic nuclei (AGNs) is still in debate, even
though it has been discussed for more than 40 years. In order to solve this old riddle, we …

Blazars are a subclass of active galactic nuclei with extreme observation properties, which is
caused by the beaming effect, expressed by a Doppler factor (), in a relativistic jet. Doppler …

We present a sample of 4388 AGNs with available radio core-dominance parameters—
defined as the ratio of the core flux densities to the extended ones, R= S core/S ext.—which …

Within a monitored duration of more than 7 yr, we obtained 1358 pairs of gri observations
(514 at the g band, 393 at the r band, and 451 at the i band) for PKS0735+ 178 with a 1.26 m …

The extragalactic radio sources are divided into two subclasses (radio-loud and radio-quiet
sources) in the literature using radio loudness (R), which is defined as the ratio of radio …

In this work, we collected a sample of BL Lacs and FR I and FR II (G) radio galaxies with
available core and extended emissions from published works to discuss the unified …

The spectacular observational phenomena lying in blazars can be well explained and
described by the relativistic beaming effect that the emission in the jet is highly boosted …

Aiming to answer an interesting question on why some radio sources can be detected by
Fermi-LAT but others cannot, we compare several parameters of Fermi-detected Fanaroff …

In this work, we compiled a sample of 1172 4FGL blazars with available spectral information
and broadband intensities to the study the spectral indices. Based on this sample, we …