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

A fraction of the active supermassive black holes at the centers of galaxiesin our Universe are capable of launching extreme kiloparsec-long relativisticjets. These jets are known multiband (radio to $\gamma$-ray) and multimessenger(neutrino) emitters, and some of them have been monitored over several decadesat all accessible wavelengths. However, many open questions remain unansweredabout the processes powering these highly energetic phenomena. These jetsintrinsically produce soft-to-hard X-ray emission that extends from$E\sim0.1\,\rm keV$ up to $E>100\,\rm keV$. Simultaneous broadband X-raycoverage, combined with excellent timing and imaging capabilities, is requiredto uncover the physics of jets. Indeed, truly simultaneous soft-to-hard X-raycoverage, in synergy with current and upcoming high-energy facilities (such asIXPE, COSI, CTAO, etc.) and neutrino detectors (e.g., IceCube), would enable usto disentangle the particle population responsible for the high-energyradiation from these jets. A sensitive hard X-ray survey ($F_{8-24\,\rmkeV}<10^{-15}\,\rm erg~cm^{-2}~s^{-1}$) could unveil the bulk of theirpopulation in the early Universe. Acceleration and radiative processesresponsible for the majority of their X-ray emission would be pinned down bymicrosecond timing capabilities at both soft and hard X-rays. Furthermore,imaging jet structures for the first time in the hard X-ray regime couldunravel the origin of their high-energy emission. The proposed Probe-classmission concept High Energy X-ray Probe (HEX-P) combines all these requiredcapabilities, making it the crucial next-generation X-ray telescope in themulti-messenger, time-domain era. HEX-P will be the ideal mission to unravelthe science behind the most powerful accelerators in the universe.

The High Energy X-ray Probe (HEX-P): the most powerful jets through the lens of a superb X-ray eye