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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The radiative and jet power in active galactic nuclei is generated byaccretion of material on to supermassive galactic-centre black holes. Forquasars, where the radiative power is by definition very high, objects withhigh radio luminosities form around 10 per cent of the population, although itis not clear whether this is a stable phase. Traditionally, quasars with highradio luminosities have been thought to present jets with edge-brightenedmorphology (Fanaroff-Riley II - FR II) due to the limitations of previous radiosurveys (i.e., FRIs were not observed as part of the quasar population). TheLOw Frequency ARray (LOFAR) Two-metre Sky Survey (LoTSS) with its unprecedentedsensitivity and resolution covering wide sky areas has enabled the firstsystematic selection and investigation of quasars with core-brightenedmorphology (Fanaroff-Riley I - FR). We carried out a Very Large Array (VLA)snapshot survey to reveal inner structures of jets in selected quasarcandidates; 15 (25 per cent) out of 60 sources show clear inner jet structuresthat are diagnostic of FRI jets and 13 quasars (around 22 per cent) showextended structures similar to those of FRI jets. Black hole masses andEddington ratios do not show a clear difference between FRI and FRII quasars.FRII quasars tend to have higher jet powers than FRI quasars. Our results showthat the occurrence of FRI jets in powerful radiatively efficient systems isnot common, probably mainly due to two factors: galaxy environment and jetpower.

VLA Snapshot Continuum Survey of FRI Quasar Candidates Selected from the LOFAR Two-Metre Sky Survey (LoTSS)