DOI

https://doi.org/10.48717/ymv1-ry81

Project

ES100

Title

e-EVN: ES100A, EO018A

Abstract

High redshift radio galaxies presents a unique potential to constrain feedback processes in the first galaxies, as radio jets are hypothesized to play a defining role in massive galaxy formation, through negative or "radio mode feedback", in which the radio jets evacuate the ISM of the host galaxy. Most radio galaxies at z > 4 do not have mas resolution observations, and show compact radio morphologies. We propose standard EVN observations of the radio continuum emission toward 7 radio galaxies at z > 4. With the proposed observations, we can study the radio morphology (single component or multi-structure) of these radio galaxies in the early Universe at mas resolution. And we will derive the projected source size and compare with radio loud quasars at similar redshift. We will see what fraction of the flux density can be covered by the mas resolution of the EVN. If core-jet morphology is detected, we may constrain feedback processes in the first galaxies. And together the published VLBI observations of other high redshift radio galaxies, we can systematically and statistically understand the jet properties and feedback: morphology, core position, extent, radio luminosity of compact jet of such a galaxy sample.