English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Over the past decade, our knowledge of the \gamma-ray sky has beenrevolutionized by ground- and space-based observatories by detecting photons upto several hundreds of tera-electron volt (TeV) energies. A major population ofthe $\gamma$-ray bright objects are active galactic nuclei (AGN) with theirrelativistic jets pointed along our line-of-sight. Gamma-ray emission is alsodetected from nearby mis-aligned AGN such as radio galaxies. While theTeV-detected radio galaxies (TeVRad) only form a small fraction of the\gamma-ray detected AGN, their multi-wavelength study offers a uniqueopportunity to probe and pinpoint the high-energy emission processes and sites.Even in the absence of substantial Doppler beaming TeVRad are extremely brightobjects in the TeV sky (luminosities detected up to 10^{45} erg/s), and exhibitflux variations on timescales shorter than the event-horizon scales (fluxdoubling timescale less than 5 minutes). Thanks to the recent advancement inthe imaging capabilities of high-resolution radio interferometry (millimetervery long baseline interferometry, mm-VLBI), one can probe the scales down toless than 10 gravitational radii in TeVRad, making it possible not only to testjet launching models but also to pinpoint the high-energy emission sites and tounravel the emission mechanisms. This review provides an overview of thehigh-energy observations of TeVRad with a focus on the emitting sites andradiation processes. Some recent approaches in simulations are also sketched.Observations by the near-future facilities like Cherenkov Telescope Array,short millimeter-VLBI, and high-energy polarimetry instruments will be crucialfor discriminating the competing high-energy emission models.

Radio galaxies - the TeV challenge