Extended X-ray emission in PKS 1718$-$649
T. Beuchert, A. Rodr\'iguez-Ardila, V.A. Moss, R. Schulz, M. Kadler,, J. Wilms, R. Angioni, J.R. Callingham, C. Gr\"afe, F. Krau{\ss}, A., Kreikenbohm, M. Langejahn, K. Leiter, F.M. Maccagni, C. M\"uller, R. Ojha, E., Ros, S.J. Tingay

TL;DR
This study uses combined Chandra and XMM-Newton data to analyze extended X-ray emission around the young AGN PKS 1718-649, revealing a hot, collisionally ionized medium likely influenced by supernovae rather than AGN feedback.
Contribution
First detailed analysis of extended X-ray emission in a GPS/CSO source using combined archival X-ray data, identifying the nature of the emitting gas.
Findings
Extended soft X-ray emission is confirmed around PKS 1718-649.
The emission originates from a hot, collisionally ionized medium.
Supernovae likely produce the observed X-ray emission, not AGN feedback.
Abstract
PKS 1718649 is one of the closest and most comprehensively studied candidates of a young active galactic nucleus (AGN) that is still embedded in its optical host galaxy. The compact radio structure, with a maximal extent of a few parsecs, makes it a member of the group of compact symmetric objects (CSO). Its environment imposes a turnover of the radio synchrotron spectrum towards lower frequencies, also classifying PKS 1718649 as gigahertz-peaked radio spectrum (GPS) source. Its close proximity has allowed the first detection of extended X-ray emission in a GPS/CSO source with Chandra that is for the most part unrelated to nuclear feedback. However, not much is known about the nature of this emission. By co-adding all archival Chandra data and complementing these datasets with the large effective area of XMM-Newton, we are able to study the detailed physics of the environment of…
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