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

We report new Herschel observations of 25 z=4.8 extremely luminous opticallyselected active galactic nuclei (AGNs). Five of the sources have extremelylarge star forming (SF) luminosities, L_SF, corresponding to SF rates (SFRs) of2800-5600 M_sol/yr assuming a Salpeter IMF. The remaining sources have onlyupper limits on their SFRs but stacking their Herschel images results in a meanSFR of 700 +/- 150 M_sol/yr. The higher SFRs in our sample are comparable tothe highest observed values so far, at any redshift. Our sample does notcontain obscured AGNs, which enables us to investigate several evolutionaryscenarios connecting super-massive black holes and SF activity in the earlyuniverse. The most probable scenario is that we are witnessing the peak of SFactivity in some sources and the beginning of the post-starburst decline inothers. We suggest that all 25 sources, which are at their peak AGN activity,are in large mergers. AGN feedback may be responsible for diminishing the SFactivity in 20 of them but is not operating efficiently in 5 others.

Extreme star formation in the host galaxies of the fastest growing super-massive black holes at z=4.8