The nuclei of most normal galaxies contain supermassive black holes, which can accrete
gas through a disk and become active. These active galactic nuclei (AGNs) can form jets that …

This review provides an overview of recent advances in multi-wavelength and multi-
messenger observations of blazars, the current status of theoretical models for blazar …

Most of the light from blazars, active galactic nuclei with jets of magnetized plasma that point
nearly along the line of sight, is produced by high-energy particles, up to around 1 TeV …

The magnetic-field conditions in astrophysical relativistic jets can be probed by
multiwavelength polarimetry, which has been recently extended to X-rays. For example, one …

The lower-energy peak of the spectral energy distribution of blazars has commonly been
ascribed to synchrotron radiation from relativistic particles in the jets. Despite the consensus …

We report the first> 99% confidence detection of X-ray polarization in BL Lacertae. During a
recent X-ray/γ-ray outburst, a 287 ks observation (2022 November 27–30) was taken using …

We present an in-depth and systematic variability study of a sample of 20 powerful blazars,
including 12 BL Lacs and 8 flat-spectrum radio quasars, applying various analysis tools …

Blazars are a class of jet-dominated active galactic nuclei with a typical double-humped
spectral energy distribution. It is of common consensus that the synchrotron emission is …

In strongly magnetized astrophysical plasma systems, magnetic reconnection is believed to
be the primary process during which explosive energy release and particle acceleration …

Relativistic jets of active galactic nuclei have been known to exist for 100 years. Blazars with
their jet pointing close to our line of sight are some of the most variable and extreme objects …