Starburst radio galaxies: general properties, evolutionary histories and triggering
C. Tadhunter, J. Holt, R. Gonzalez Delgado, J. Rodriguez Zaurin, M., Villar-Martin, R.Morganti, B. Emonts, C. Ramos Almeida, K. Inskip

TL;DR
This study analyzes starburst radio galaxies, revealing their diverse triggering mechanisms linked to galaxy mergers and complex gas infall histories, with implications for understanding active galactic nucleus activity.
Contribution
It provides a spectral synthesis analysis linking starburst ages and galaxy morphologies to different triggering scenarios for radio activity in galaxies.
Findings
Starburst radio galaxies constitute 15-25% of powerful radio sources.
Triggering of radio jets occurs at various stages of galaxy mergers.
Radio-loud AGN activity is associated with multiple gas accretion events.
Abstract
In this paper we discuss the results of a programme of spectral synthesis modelling of a sample of starburst radio galaxies in the context of scenarios for the triggering of the activity and the evolution of the host galaxies. The starburst radio galaxies -- comprising ~15 - 25% of all powerful extragalactic radio sources -- frequently show disturbed morphologies at optical wavelengths, and unusual radio structures, although their stellar masses are typical of radio galaxies as a class. In terms of the characteristic ages of their young stellar populations (YSP), the objects can be divided into two groups: those with YSP ages t_ysp < 0.1 Gyr, in which the radio source has been triggered quasi-simultaneously with the main starburst episode, and those with older YSP in which the radio source has been triggered or re-triggered a significant period after the starburst episode. Combining the…
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