DOI

https://doi.org/10.48717/kzt3-p206

Project

GS045

Title

GS045A

Abstract

We propose global spectral-line VLBI observations of two radio galaxies in which signatures of jet-driven outflows of atomic hydrogen (HI) have been detected. High-resolution observations are vital to locate the outflow with respect to the parsec-scale radio jets and determine the physical properties of the gas which cannot be achieved by lower-resolution observations. Our recent VLBI studies on a small, but diverse sample of young and re-started radio galaxies have shown that these outflows are highly clumpy, but may also have a diffuse component. This result is important because, according to simulations, the clumpiness of the medium is a key ingredient to enhance the impact of radio jet on the surrounding medium. By observing 4C31.04 and OQ208, we want to expand our still small sample and cover a larger parameter space for the outflow and corresponding radio source. HI outflows represent a striking feature of how the radio jets affect the interstellar medium of the host galaxy. As such our study has implications for our understanding of the evolution of radio galaxies and it will provide important constraints for numerical simulations of jet-driven feedback.