More evidence for extinction of activity in galaxies
Andrzej Marecki, Bartlomiej Swoboda (Torun Centre for Astronomy, N., Copernicus University, Torun)

TL;DR
This paper presents evidence that galaxies can transition from active to quiescent states, similar to X-ray binaries, and maps their evolutionary stages, supported by observations of relic radio lobes and past quasar activity.
Contribution
It demonstrates that galaxy evolution can be understood through analogies with X-ray binary states, supported by observational evidence of relic radio structures.
Findings
Post-active galaxies have relic radio lobes indicating past activity.
Galaxies can reach intermediate states before becoming quiescent.
Evolutionary stages of galaxies mirror those of X-ray binaries.
Abstract
This Research Note amends an article in which we showed that radio-loud quasars can become radio-quiet. Exploring the analogy between galactic nuclei and X-ray binaries (XRB), we pointed out there that this transition in quasars could be identified with a switch from low/hard to high/soft state in microquasars. Here, we present the evidence that traces of past occurrences of this kind of phenomena can be found in normal but once active galaxies. Based on the properties of a few such "post-active" galaxies that are representative for a much wider group, it has been argued that they have reached the evolutionary stages when their nuclei, which were radio-loud in the past, now, mimicking the behaviour of XRBs, remain in the intermediate state on their way towards quiescence or even have already entered the quiescent state. It follows that the full evolutionary track of XRBs can be mapped…
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