Astronomers Trace Unprecedented Fast Radio Burst to an Ancient, Dead Galaxy

In an extraordinary discovery, astronomers have pinpointed the origin of a fast radio burst (FRB) to the outer regions of an ancient, dead elliptical galaxy — a location far different from the active, star-forming galaxies previously associated with such phenomena.

Figure 1. Ancient, Dead Galaxy Across the Universe Reveals Mysterious Space Signal.

The groundbreaking findings, outlined in two complementary studies led by Northwestern University and McGill University, challenge the long-standing assumption that FRBs are solely linked to regions of active star formation. Instead, the new observations suggest that the origins of these mysterious cosmic events may be more varied than once thought. Figure 1 shows Ancient, Dead Galaxy Across the Universe Reveals Mysterious Space Signal.

Shifting the Understanding of FRBs

“The prevailing theory is that FRBs originate from magnetars formed through core-collapse supernovae,” said Tarraneh Eftekhari of Northwestern, who led one study and coauthored the other. “However, this discovery contradicts that idea. While young, massive stars typically end their lives in supernovae, there’s no evidence of young stars in this galaxy. This suggests that FRBs may not all come from young stars. Perhaps a subset of these bursts is linked to older cosmic systems.”

Wen-fair Fong, a senior author on both studies and associate professor of physics and astronomy at Northwestern, added, “This discovery reminds us that just when we think we understand an astrophysical phenomenon, the universe reveals something unexpected. It’s this constant ‘dialogue’ with the cosmos that makes time-domain astronomy so exhilarating.”

Advanced Detection Techniques Lead to New FRB Discovery

Astronomers first detected the new fast radio burst (FRB), designated FRB 20240209A, in February 2024 using the Canadian Hydrogen Intensity Mapping Experiment (CHIME). FRBs are brief, powerful radio blasts that release more energy in milliseconds than the Sun does in an entire year. However, this particular FRB was unique, flaring up multiple times. Between February and July 2024, the same source emitted 21 additional pulses, six of which were also detected by a nearby outrigger telescope 60 kilometers away from CHIME. These smaller versions of CHIME allow astronomers to more precisely pinpoint the location of FRBs in the sky.

Uncovering the Massive Host Galaxy

After pinpointing the FRB's location, the team quickly turned to the W.M. Keck and Gemini observatories for further investigation. Northwestern astronomers, with remote access to the Keck Observatory, observed that the FRB originated not from a young galaxy, but from the edge of a massive, ancient galaxy. This galaxy, located 2 billion lightyears from Earth, is 11.3 billion years old. The team used high-performance computers to run simulations and found that the galaxy is extraordinarily luminous and massive — 100 billion times the mass of our Sun.

"This could be the most massive FRB host galaxy discovered," said Eftekhari. "It ranks among the most massive galaxies known."

An Unexpected Location for a Cosmic Event

While most FRBs are located near the centers of their host galaxies, FRB 20240209A is situated at the outskirts, 130,000 lightyears from the galaxy’s center, where few stars reside. "This FRB is the furthest from the center of its galaxy that we've found," said Vishwangi Shah, a graduate student at McGill University. "This is both surprising and exciting, as FRBs are typically expected to emerge from star-forming regions, and this one is far from any active star formation."

Revealing Possible Cosmic Twins

Before this discovery, only one other FRB had been detected in the outer regions of a galaxy — one that originated from the edge of Messier 81 (M81), a spiral galaxy located about 12 million lightyears away. Despite the difference in galaxy type, the two events share striking similarities. "The M81 FRB was found in a globular cluster, which changed the way we thought about FRBs," Fong explained. "This new FRB could be its cosmic twin, located far from any new star formation in an older environment. It challenges our conventional models of FRB origins and may point to more exotic formation channels."

Exploring Possible Origins

The McGill-led study speculates that this new FRB might have originated within a dense globular cluster. Such clusters are potential sites for magnetars, which could form through various mechanisms, including the merger of neutron stars or the collapse of a white dwarf. "A globular cluster origin seems the most likely explanation for why this FRB is located so far from its host galaxy," said Shah. The team has submitted a proposal for follow-up observations using the James Webb Space Telescope to confirm whether a globular cluster is indeed present at the FRB's location.

“There is still much to explore,” Eftekhari added. “The environments surrounding FRBs could be the key to unlocking the mystery behind these cosmic phenomena.”

Source: SciTECHDaily

Cite this article:

Priyadharshini S (2025), "Mysterious Space Signal Traced Back to An Ancient, Dead Galaxy Across the Universe",AnaTechMaz, pp. 194