Astronomers have discovered a colossal burst of energy emanating from a particular type of neutron star in a galaxy relatively close to ours. This finding, published recently in the journal Nature, marks scientists’ first observation of a giant flare from a magnetar outside the Milky Way galaxy.

Magnetars are a breed of neutron star, the collapsed core of a massive star that explodes in a supernova. They are incredibly dense objects, packing more mass than the Sun into a sphere just a few dozen kilometers across. But what truly sets magnetars apart is their mind-bogglingly powerful magnetic field, trillions more potent than Earth’s.

Occasionally, these magnetic fields become twisted and tangled, releasing their pent-up energy in enormous flares. These flares, predominantly composed of high-energy gamma rays, are the universe’s most potent non-destructive energy releases.

The European Space Agency’s Integral gamma-ray observatory made a recent discovery. In November 2023, Integral detected a brief, powerful burst of gamma rays originating from Messier 82 (M82), a galaxy nicknamed the “Cigar Galaxy” due to its elongated shape. M82 is a starburst galaxy, churning out new stars at a furious rate compared to our Milky Way.

“We can say that magnetars are neutron stars powered by their magnetic energy,” said Dr. Sandro Mereghetti, lead author of the study. “This doesn’t happen in ordinary neutron stars.”

The fleeting Nature of the flare, lasting only a fraction of a second, combined with its location in M82, immediately piqued the researchers’ interest. Gamma-ray bursts, typically associated with distant and highly energetic events, were quickly ruled out. Further observations confirmed the source as a magnetar within M82.

“The fact that Messier 82 is so active in star formation is relevant for our finding,” said co-author Dr. Silvia Rigoselli. The violent birth pangs of stars within M82 might play a role in the formation or activity of magnetars, a connection scientists are eager to explore further.

This discovery holds immense significance for understanding magnetars and their explosive outbursts. While giant flares have been observed within our galaxy, this is the first time we’ve witnessed one from afar. Studying a magnetar flare in another galaxy allows scientists to analyze the phenomenon without the potentially distorting effects of the flare’s interaction with our atmosphere.

“By studying this event outside our galaxy, we can gain new insights into the physics of these powerful stellar objects,” said Dr. Mereghetti.

The newfound extragalactic magnetar flare offers a unique opportunity to probe the Nature of these extreme objects and the environments that might influence their behavior. Unveiling the secrets of magnetars will deepen our understanding of stellar evolution and shed light on the complex and energetic processes at play in the cosmos.