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 radio quasar luminosity function exhibits an upturn around$L_{6\rm\:GHz}=10^{23}$ W Hz$^{-1}$ that is well-modelled by a star-forminghost galaxy population. This distribution leads some authors to cite starformation as the main radio emission mechanism in so-called radio-quiet quasars(RQQs). Understanding the origin of RQQ radio emission is crucial for ourunderstanding of quasar feedback mechanisms -- responsible for the regulationof star-formation in the host galaxy -- and for understanding galaxy evolutionas a whole. By observing RQQs that have been magnified by strong gravitationallensing, we have direct access to the RQQ population out to cosmic noon, whereevidence for twin mini-jets has recently been found in a sub-\textmu Jy RQQ.Here we present radio observations of two lensed RQQs using the VLA at 5~GHz,the latest objects to be observed in a sample of quadruply-imaged RQQs above-30$^{\circ}$. In SDSS~J1004+4112 we find strong evidence for AGN-related radioemission in the variability of the source. In PG~1115+080 we find tentativeevidence for AGN-related emission, determined by comparing the radio luminositywith modelled dust components. If confirmed in the case of PG~1115+080, whichlies on the radio--FIR correlation, the result would reinforce the need forcaution when applying the correlation to rule out jet activity and whenassuming no AGN heating of FIR-emitting dust when calculating star formationrates. Our programme so far has shown that two of the faintest radio sourcesever imaged show strong evidence for AGN-dominated radio emission.

Using strong lensing to understand the microJy radio emission in two radio quiet quasars at redshift 1.7