Is There an Ancient Star Core in the Heart of Our Galaxy?
Astronomers have identified a strong pulsar candidate near the center of the Milky Way, a discovery that could provide a rare opportunity to study gravity in one of the most extreme environments in the universe. The object appears to be a rapidly spinning neutron star located close to Sagittarius A*, the supermassive black hole at the core of our galaxy.
If confirmed, the finding could allow researchers to test predictions of Einstein’s theory of general relativity under intense gravitational conditions.
What Is a Pulsar?
A pulsar is a highly dense neutron star formed after a massive star collapses in a supernova explosion. As it spins, it emits beams of electromagnetic radiation from its magnetic poles. If those beams sweep across Earth, they are detected as regular pulses of radio waves.
The newly identified candidate rotates approximately once every 8.19 milliseconds, placing it in the category of millisecond pulsars. Its proximity to Sagittarius A*, which has a mass roughly four million times that of the Sun, makes it particularly valuable for gravitational studies.
The Discovery and Research Team
The findings were published on February 9, 2023, in The Astrophysical Journal. The research was led by Karen Perez of the SETI Institute, who conducted the work during her doctoral studies at Columbia University.
The team describes the object as a strong pulsar candidate, pending further observational confirmation. Additional data will be required to determine whether the signal definitively originates from a neutron star.
Testing Gravity Near a Black Hole
Einstein’s theory of general relativity proposes that massive objects curve space-time, influencing how matter and light move around them. A pulsar orbiting close to a supermassive black hole offers a natural laboratory for testing these predictions.
Because pulsars emit extremely regular signals, even small deviations in pulse timing can reveal gravitational effects. As radio waves from the pulsar travel through the curved space-time surrounding Sagittarius A*, researchers may detect measurable time delays or signal distortions. Such measurements could refine current models of gravity and potentially reveal new physics.
The Galactic Center Survey
The signal was detected through the Breakthrough Listen Galactic Center Survey, a program designed to search for unusual radio signals near the Milky Way’s center. While Breakthrough Listen is widely known for its search for extraterrestrial intelligence, the survey also contributes to broader astrophysical research, including the study of pulsars and other compact objects.
All observational data from the project have been made publicly available, allowing independent researchers to analyze the findings.
Scientific Implications
If confirmed, the pulsar would provide an exceptional tool for studying the gravitational environment near Sagittarius A*. Pulsars located close to supermassive black holes are rare and difficult to detect due to interference from surrounding gas, dust, and radio noise.
Precise timing measurements could help scientists better understand how gravity behaves in extreme conditions, test aspects of general relativity, and improve models of black hole dynamics.
Next Steps
Researchers are conducting follow-up observations to confirm the nature of the signal. Additional measurements will determine whether the object is indeed a pulsar and whether it is gravitationally bound to Sagittarius A*.
Confirmation would mark a significant step forward in efforts to study the Galactic Center and explore fundamental questions about gravity and space-time.
Citation Karen I. Perez et al 2026 ApJ 998 147DOI 10.3847/1538-4357/ae336c
