XRISM Mission Captures Pulsar Wind Accretion

NASA and JAXA’s XRISM observatory used high-resolution X-ray spectroscopy to directly observe a pulsar capturing stellar wind from its giant companion, fueling powerful X-ray flares in the Cygnus X-1/3 region.

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  1. First Direct Observation of Accretion Process: The mission utilized the Resolve instrument to measure the speed and density of the stellar wind, providing the first clear evidence of how pulsars harness matter to power X-ray bursts.
  2. Key Scientific Instruments Involved: Data was collected primarily by the Resolve microcalorimeter spectrometer, which offers unprecedented X-ray energy resolution compared to previous missions like Chandra or XMM-Newton.
  3. Pulsar Identity: Cygnus X-1 and Related Sources: The observations focused on high-mass X-ray binaries, where a compact pulsar strips material from a massive supergiant companion, resulting in intense spectral emission lines.

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