Scientists Decode Mysterious X-ray Flares from ULX M74 X-1

• 31 Mar 2026

In March 2026, Scientists from the Raman Research Institute (RRI) studied rare, repeating energy bursts from an ultraluminous X-ray source (ULX), offering new insights into extreme cosmic phenomena.

Key Points

• Study Focus:
  • Observations of ULX M74 X-1 located in the spiral galaxy Messier 74.
  • Detected irregular X-ray flares lasting about 30 minutes, with no fixed periodicity.
• What are ULXs:
  • Systems where a black hole or neutron star accretes matter from a companion star.
  • Can exceed the Eddington limit by over 100 times.
• Data Sources:
  • Chandra X-ray Observatory.
  • XMM-Newton.
  • Observations spanning 2001-2021.
• Key Observations:
  • Flaring phase shows spectral feature at ~1 kilo electron volt (keV) → indicates strong radiation-driven winds.
  • Non-flaring phase shows high-energy photons → clear view of accretion disk.
• Proposed Explanation:
  • “Wobbling” accretion disk causes winds to move in and out of view.
  • Leads to irregular brightness variations and flares.
• Nature of Compact Object:
  • Estimated mass ~7 times that of the Sun → suggests stellar-mass black hole.
  • However, characteristics also match neutron star ULXs.
  • Next Steps: Search for pulsations to confirm whether the object is a neutron star or black hole.