Description
The supermassive black hole housing nuclei of galaxies show episodes of activity and of quiescence. Through feedback mechanisms, this episodic activity can have significant effects on their surroundings, encouraging or discouraging the processes of cosmic structure formation. . Radio observations at metre-wavelengths of a subset of such active galaxies, the so-called jetted radio galaxies can be excellent large-scale probes of such
nuclear activity, due to the large-scale extent of such jets sometimes extending to Mpc scales which provide a direct measurement of the time-integrated influence of the AGNs as well as serving as easily discernible signposts of nuclear activity. Sensitive radio observations can record faint emission associated with the previous epochs of activity, and it is expected that new telescopes like MeerKAT, ASKAP and LOFAR will reveal whole populations of such sources. In this talk, I’ll present an analysis of observations of a X-shaped, restarted, triple-double, giant radio galaxy, carried out with the South African radio telescope MeerKAT, which shows three extant epochs of nuclear activity in a group-environment galaxy. Using broadband continuum and spectral radio observations in L and UHF bands, I’ll endeavour to present a coherent picture of the source; and speculate about the cause for the repeated activity of this extremely unusual radio galaxy.
| Stream | Science |
|---|