086443

We propose to observe the bright quasar 3C 234 for 160 ks using the RGS as prime instrument. This observation will provide the first deep high-resolution X-ray spectrum ever obtained of a narrow-line radio-loud AGN. Our preliminary RGS data of April 2019 display comma for the first time comma a clear evidence of soft X-ray emission lines in an obscured radio-loud AGN. The superior spectral quality that will be achieved with the new observation will allow us to unambiguously determine the physical conditions of the ionized gas. This will provide an unprecedented insights on the longstanding debate about the nature of the soft X-ray emission in radio-loud type 2 AGN.