Origin of the 150 kpc radio filament in galaxy ESO 137-006
The study investigated a 150 kpc radio filament (CST1) in ESO 137-006 to determine its origin. By comparing its dynamical age (~70 Myr) with its synchrotron cooling time (~130 Myr), the researchers concluded that CST1 is most likely the forward shock front of the AGN cocoon. This suggests a sub-Eddington accretion rate for the central black hole.