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NASA and JAXA’s XRISM Mission Captures Detailed Data from X-Ray Emitting Wolf-Rayet Star

A new analysis of Cygnus X-3, a distinctive stellar system, has been produced by XRISM (X-ray Imaging and Spectroscopy Mission), a collaboration led by the Japan Aerospace Exploration Agency (JAXA) with participation from NASA. By examining X-ray emissions from this unique binary system, XRISM has provided astronomers with the clearest depiction to date of the energetic gas flows at work.

Intriguing Characteristics of Cygnus X-3

The system consists of a high-mass Wolf-Rayet star and a likely black hole, making it one of the most frequently studied objects in X-ray astronomy, detailed NASA.

Ralf Ballhausen, a postdoctoral associate at the University of Maryland and NASA’s Goddard Space Flight Center, commented on the importance of the system’s Wolf-Rayet star, noting its strong stellar winds that release gas outward in a statement to NASA.

The compact companion within the system draws in some of this material, heating it to emit high-energy X-rays. With the help of XRISM’s Resolve spectrometer, scientists can now observe the intricate gas dynamics involved in this process, capturing details previously unavailable.

XRISM’s Resolve Instrument Reveals New Spectral Details

Timothy Kallman, an astrophysicist at NASA Goddard, highlighted the importance of Cygnus X-3 for XRISM’s observations, describing it as an ideal object for the mission’s capabilities due to its appropriate brightness within XRISM’s energy sensitivity range on NASA’s official website.

The observations, taken over 18 hours, reveal a spectrum indicating complex gas dynamics, including outflows from the Wolf-Rayet star and interactions with the likely black hole.

Doppler Effect Provides Clues on Gas Movement

Due to the rapid movement of gas within the system, certain features of the X-ray spectrum have been shifted in energy—a phenomenon explained by the Doppler effect. Brian Williams, NASA’s project scientist for the mission, noted that this effect has allowed researchers to observe high-velocity shifts that shed light on the star’s stellar wind dynamics, absorption patterns, and possible black hole characteristics.

 

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