XRISM’s precision measurements will unveil a Universe in motion.
The XRISM calorimeter will register X-rays from deep space. Part of the device was built using parts from the ill-fated Hitomi mission, as can be seen by the engraved"ASTRO-H" — an earlier name for the mission.Astronomers will be on the edge of their seats this Sunday, when a long-awaited space mission is due to begin. The X-Ray Imaging and Spectroscopy Mission will launch at 9.30 am local time on an H-IIA rocket from Tanegashima Space Center in Japan.
The science will be “very exciting — for me and, I believe, for other X-ray astronomers”, says Makoto Tashiro, an X-ray astronomer at Saitama University who is XRISM’s principal investigator. XRISM, a joint mission of the Japan Aerospace Exploration Agency and NASA, with a further contribution from the European Space Agency , is expected to operate for around three years.
XRISM’s unique feature will be its X-ray calorimeter, a technology developed at NASA in the 1980s that detects electromagnetic radiation through changes in temperature in the order of millionths of a degree. The energies of individual X-ray photons are related to their wavelengths, and knowing this will enable astronomers to distinguish the signatures of chemical elements, helping astrophysicists to reconstruct the history of the cosmos.
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