Landing page for project EG119

The active high-redshift Universe has been deeply studied in the last twenty years, revealing a large population of powerful quasars, hosting active supermassive black holes with extreme masses and fast accretion rates. These findings have challenged our understanding of the first black hole formation and evolution, since it is not clear how such massive sources are already fully formed at much less than a Gigayear from the Big Bang. Jetted quasars have proved to be more frequent at z>4 than in the local Universe, even without the usually considered smoking gun of their presence: a strong radio-loudness. A key role of jets in the fast evolution of supermassive black holes is thus currently under investigation. For this reason, we are asking 30 hours of phase-referenced observations for a sample of ten radio-detected z>5 quasars. The less radio-loud one is already VLA-imaged, confirming the presence of a relativistic jet, and we aim at confirming physical and geometrical details of such structure. The other nine span a wide range of radio-loudnesses: we aim at researching the variety of relativistic jet features in the early Universe.

This data is part of the archive of VLBI data maintained by JIVE on behalf of the EVN, a network of radio telescopes located primarily in Europe and Asia, with additional antennas in South Africa. The EVN archive itself has the DOI https://doi.org/10.17616/R3Z197