Compelling new evidence that supports the existence of a long-sought supermassive black hole at the center of the nearby galaxy Messier 83 (M83) has been unveiled by astronomers using the James Webb Space Telescope.
The unexpected discovery, made possible with observations from Webb’s Mid-Infrared Instrument (MIRI), reveals some of the most compelling data yet suggesting a black hole has been lurking near the heart of the spiral galaxy, as astronomers have long suspected.
The detection of highly ionized neon gas near M83’s galactic nucleus reveals an energetic signature that is commonly linked to the presence of an active galactic nucleus (AGN), which is the calling card of a growing supermassive black hole.
The new findings challenge past data spanning several decades, while opening new pathways to the hidden dynamics behind what astronomers call the “Southern Pinwheel Galaxy.”
A Decades-Long Mystery
Astronomers have long recognized that massive spiral galaxies may harbor AGNs at their cores. However, confirming the presence of one at the heart of M83 had proven difficult, since earlier observations seemed to indicate that any black hole hiding there must have been either dormant, or deeply concealed in dusty cosmic material.
Enter Webb’s powerful mid-infrared capabilities, which allow astronomers an unprecedented ability to peer beyond the cosmic veil produced by such material by observing light at wavelengths invisible to the naked eye—and to earlier space telescopes like Hubble.
“Our discovery of highly ionised neon emission in the nucleus of M83 was unexpected,” said Svea Hernandez, lead author of the study and a researcher with AURA for the European Space Agency at the Space Telescope Science Institute in Baltimore. “These signatures require large amounts of energy to be produced—more than what normal stars can generate. This strongly suggests the presence of an AGN that has been elusive until now.”
Seeing the Invisible
With MIRI’s capabilities, Webb was able to spot small clumps of highly ionized gas located near M83’s core. Astronomers recognize that the energy required to produce signatures like these exceeds what can be accounted for by supernovae or other common stellar activity.
Right now, the leading explanation for Webb’s observations is an AGN, although a few alternatives still exist. Among these, astronomers are also considering extreme shock waves in the surrounding interstellar medium as another possible explanation.
“Before Webb, we simply did not have the tools to detect such faint and highly ionized gas signatures in M83’s nucleus,” Hernandez added. “Now, with its incredible mid-infrared sensitivity, we are finally able to explore these hidden depths of the galaxy and uncover what was once invisible.”
A New Era of Discovery
“Webb is revolutionizing our understanding of galaxies,” said Linda Smith, co-author of the study and a researcher at the Space Telescope Science Institute. “For years, astronomers have searched for a black hole in M83 without success. Now, we finally have a compelling clue that suggests one may be present.”
“This discovery showcases how Webb is making unexpected breakthroughs,” Smith added. “Astronomers thought they had ruled out an AGN in M83, but now we have fresh evidence that challenges past assumptions and opens new avenues for exploration.”
As next steps, the team is now planning follow-up investigations that will incorporate observations from other instrumental arrays, such as the Atacama Large Millimeter/submillimeter Array (ALMA) and the Very Large Telescope (VLT). Data obtained using these powerful observatories will help astronomers determine if the emission revealed in the latest Webb data indeed originates from a supermassive black hole, or if one of the other high-energy possibilities offers a better explanation.
Fundamentally, the new findings highlight the crucial role the James Webb Space Telescope now plays in helping expand black hole astrophysics, by uncovering hidden features in nearby galaxies.
Further investigations into these enigmatic structures may ultimately reveal the clearest picture yet of these persistent cosmic mysteries, ultimately bringing the long-hidden features of black holes into focus.
The team’s results were reported in a new paper, “JWST/MIRI Detection of [Ne v] and [Ne vi] in M83: Evidence for the Long Sought-after Active Galactic Nucleus?”, which appeared on April 17, 2025, in The Astrophysical Journal.
Micah Hanks is the Editor-in-Chief and Co-Founder of The Debrief. He can be reached by email at micah@thedebrief.org. Follow his work at micahhanks.com and on X: @MicahHanks.