Radio-loud compact radio sources (CRSs) are characterised by morphological compactness
of the jet structure centred on the active nucleus of the galaxy. Most of the local elliptical …

ABSTRACT Narrow-line Seyfert 1 (NLSy1) galaxies are an enigmatic class of active galactic
nuclei (AGN) that exhibit peculiar multiwavelength properties across the electromagnetic …

The Fermi fourth catalog of active galactic nuclei (AGNs) data release 3 (4LAC-DR3)
contains 3407 AGNs, out of which 755 are flat spectrum radio quasars (FSRQs), 1379 are …

The deepest all-sky survey available in the γ-ray band–the last release of the Fermi-LAT
catalogue (4FGL-DR3) based on the data accumulated in 12 years contains more than 6600 …

Changing-look active galactic nuclei (AGNs) are a special class of AGNs that change their
spectral type from type 1 to type 2 or vice versa. In recent years, a number of changing-look …

The determination of distance is fundamental in astrophysics. Gamma-ray sources are
poorly characterized in this sense, as the limited angular resolution and poor photon-count …

We present an incremental version (4FGL-DR4, for Data Release 4) of the fourth Fermi-LAT
catalog of gamma-ray sources. Based on the first 14 years of science data in the energy …

Recent works have developed samples of blazars from among the Fermi Large Area
Telescope unassociated sources via machine-learning comparisons with known blazar …

Previous studies on the fitting of spectral energy distributions (SEDs) often apply the external-
Compton process to interpret the high-energy peak of low-synchrotron-peaked (LSP) BL Lac …

We study the general physical properties of Fermi blazars using the Fermi fourth source
catalog data (4FGL-DR2). The quasi-simultaneous multiwavelength data of Fermi blazars …