DOI

https://doi.org/10.48717/xwsp-k192

Project

ER051

Title

Resolving the Core/Jet System in the Giant Radio Galaxy ESO422-G028

Abstract

Gigahertz peaked-spectrum (GPS) and compact steep-spectrum (CSS) radio sources comprise a significant fraction of the radio source population detected at centimeter wavelengths. However, the physics of such sources are not well-understood. In particular, VLBI-resolution observations of CSS sources reveal a dichotomy in morphology, with some CSS exhibiting a core/jet morphology, and others revealing a double-lobed morphology reminiscent of their large-scale radio galaxy counterparts. We will observe the radio core of the giant radio galaxy (GRG) ESO422-G028 using the EVN in conjunction with e-MERLIN in order to reveal its small-scale morphology. The broad-band spectral energy distribution exhibits a low-frequency turnover and high-frequency spectral break, features commonly seen in the spectra of CSS sources. Resolving the radio core will allow us to break the degeneracy in the low-frequency absorption mechanism, as well as allowing us to study the link between emission on parsec scales (in the core) and on megaparsec scales (the full size of the GRG). These observations will also allow us to probe the physics of the radio jet and counter-jet in great detail, which is not currently possible with the data in hand.