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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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.
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The X-ray mission XRISM has uncovered new clues to how certain chemical elements ―specifically those with odd atomic numbers (odd number of protons), such as chlorine and potassium― were created in the Universe. By observing the famous supernova remnant Cassiopeia A, XRISM detected clear X-ray signals from these elements for the first time.
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XRISM observes a cometary interloper 3I/ATLAS from beyond the solar system
The interstellar comet C/2025 N1 (3I/ATLAS), discovered on July 1, 2025, is an exceptionally rare object that arrived from beyond our solar system. To date, only two interstellar objects have ever been confirmed—C/2017 U1 (1I/ʻOumuamua) and C/2019 V4 (2I/Borisov). Researchers have observed these visitors across multiple wavelengths, including optical, infrared, and radio, in an effort to understand the properties of materials formed outside the solar system.