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Published November 2017 | Submitted + Published
Journal Article Open

Changing-Look AGNs or Short-Lived Radio Sources?


The evolution of extragalactic radio sources has been a fundamental problem in the study of active galactic nuclei for many years. A standard evolutionary model has been created based on observations of a wide range of radio sources. In the general scenario of the evolution, the younger and smaller Gigahertz-Peaked Spectrum (GPS) and Compact Steep Spectrum (CSS) sources become large-scale FRI and FRII objects. However, a growing number of observations of low power radio sources suggests that the model cannot explain all their properties and there are still some aspects of the evolutionary path that remain unclear. There are indications, that some sources may be short-lived objects on timescales of 10^4–10^5 years. Those objects represent a new population of active galaxies. Here, we present the discovery of several radio transient sources on timescales of 5–20 yrs, largely associated with renewed AGN (Active Galactic Nucleus) activity. These changing-look AGNs possibly represent behavior typical for many active galaxies.

Additional Information

© 2017 Wołowska, Kunert-Bajraszewska, Mooley and Hallinan. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. Received: 31 August 2017; Accepted: 25 October 2017; Published: 17 November 2017. Author Contributions: All authors participated in acquisition, analysis and interpretation of data as well as the preparation of the manuscript. The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. This is the contribution to the proceedings of the conference "Quasars at all cosmic epochs," held in Padua (Italy) in April 2017.

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Published - fspas-04-00038.pdf

Submitted - 1712.00251.pdf


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August 22, 2023
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