Astronomers have identified a black hole at the centre of a nearby galaxy that is growing at an exceptional rate and producing a radio outburst unlike anything previously observed. An international team led by Stefanie Komossa of the Max Planck Institute for Radio Astronomy in Bonn reported that the galaxy has been shining unusually brightly in radio wavelengths for more than eight years, an extraordinary persistence for such an event.
The galaxy, catalogued as SDSS J110546.07+145202.4, lies about 1.8 billion light-years from Earth in the constellation Leo. Researchers found that the intensity of its radio emission has increased more than twentyfold over a short period and shows no sign of weakening, making it a uniquely long-lived source in a class of phenomena that normally fades quickly.
Most radio transients associated with the centres of galaxies last only days or weeks before dimming. By contrast, this source has remained brilliant for several years, marking what the team describes as the first object of its kind. The combination of extreme brightness and remarkable longevity has allowed astronomers to study the event in detail rather than catching only a fleeting glimpse.
By combining new observations with archival data stretching back years, the researchers concluded that a growing amount of matter has been falling into the black hole. That inflow appears to be powering a high-energy jet of particles, launched from the immediate surroundings of the black hole and radiating strongly at radio frequencies as it interacts with its environment.
The discovery is significant because the conditions on display resemble those thought to have prevailed in the early universe, when black holes grew rapidly and drove powerful jets. Studying a comparatively close example allows scientists to examine processes that are otherwise visible only in extremely distant, faint galaxies, effectively opening a window onto the cosmos as it was billions of years ago.
The team plans to keep monitoring the galaxy with radio telescopes to track how the outburst evolves and whether it eventually subsides. Continued observation could refine models of how supermassive black holes accumulate mass and how their jets form, questions that sit at the heart of efforts to understand how galaxies and their central engines developed over cosmic time.
Comments