The PASJ ( Publications of the Astronomical Society of Japan) special issue on XRISM has been published.
News PASJ Special Issue: Initial Results from XRISM
Related Topics
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Awakening the Monster in an Explosive Starburst Galaxy
Nearly every galaxy in the Universe harbors a supermassive black hole at its center, with masses ranging from millions to billions of times that of the Sun. It is believed that these galaxies and black holes have grown together through a process of co-evolution, influencing the development of each other. A key to understanding this relationship is the "ultra-fast outflow," which refers to the powerful winds blowing from the vicinity of the black hole. However, it has remained a major mystery when these winds develop and at what point they begin to impact the evolution of the galaxy.
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Probing Spacetime Distortion around a Black Hole
The X-ray Imaging and Spectroscopy Mission XRISM has successfully observed X-rays emitted from the innermost regions of the accretion disk surrounding the supermassive black hole at the center of the active galaxy MCG–6-30-15. According to Einstein’s theory of general relativity, light originating close to a black hole is strongly affected by intense gravity, which distorts spacetime and alters the observed wavelengths of the radiation.
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XRISM finds black hole outburst similar to outbursts on the Sun
The X-Ray Imaging and Spectroscopy Mission (XRISM) has observed a sudden, powerful outburst of gas from near a supermassive black hole in the active galaxy NGC 3783. Data collected in July 2024 reveal a high-speed outflow traveling at about 60,000 kilometers per second—roughly 20 percent of the speed of light.