“New features have been uncovered in this galaxy in the form of multiple, extremely collimated threads of radio emission connecting the lobes of the galaxy. The radio emission from the threads is likely synchrotron radiation caused by the high-energy electrons spiralling in a magnetic field,” explains Mpati Ramatsoku, a Research Fellow at Rhodes University and lead author of the study.
The nature of these unusual features is unclear. It is possible that these features may be unique to ESO 137-006, because of its harsh environment, but it is equally possible that these features are common in radio galaxies but, so far, we have been unable to detect them due to sensitivity and resolution limits. According to the team that made this discovery, which is composed of collaborators from South Africa and Italy and is partly funded by the European Research Council, further observations and theoretical efforts are required to clarify the nature of these newly discovered features.
Ramatsoku points out that understanding the nature and the physics of these collimated synchrotron threads (CST) could open a new science case for sensitive radio interferometers like MeerKAT and, in the future, the SKA.
“This is exciting because we did not expect it at all,” says Professor Oleg Smirnov, Head of the Radio Astronomy Research Group at SARAO. “Such serendipitous discoveries are very important for MeerKAT because it highlights its incredible capacity for finding the ‘unknown unknowns’ in our Universe,” he continues.
The article based on this study has been published in the Astronomy & Astrophysics journal. Access it here.