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

All galaxies once passed through a hyperluminous quasar phase powered byaccretion onto a supermassive black hole. But because these episodes are brief,quasars are rare objects typically separated by cosmological distances. In asurvey for Lyman-alpha emission at redshift z ~ 2, we discovered a physicalassociation of four quasars embedded in a giant nebula. Located within asubstantial overdensity of galaxies, this system is probably the progenitor ofa massive galaxy cluster. The chance probability of finding a quadruple quasaris estimated to be ~10^-7, implying a physical connection between Lyman-alphanebulae and the locations of rare protoclusters. Our findings imply that themost massive structures in the distant universe have a tremendous supply (~10^11 solar masses) of cool dense (volume density ~1 cm^-3) gas, which is inconflict with current cosmological simulations.

Quasar Quartet Embedded in Giant Nebula Reveals Rare Massive Structure in Distant Universe