Super DIOS Project for Exploring “Dark Baryon”

The Super DIOS project, which is an improved version of DIOS (Diffuse Intergalactic Oxygen Surveyor), is one of the candidates for Japan’s future scientific satellites, to be launched after 2030. The main scientific objective of the project is to unravel the flow of energy and metal cycles at various scales from galaxies, galaxy clusters to the warm-hot intergalactic medium along the Cosmic Web. The primary goal is the quantification of baryons, especially the unidentified “dark baryons”. Super DIOS will have a wide field of view of ∼ 1 degree, with an angular resolution of ∼ 15 arcseconds and high energy resolution ( E/dE > 1000 ). The detector will be a 30 kilo-pixel array of Transition Edge sensor (TES) with a micro-wave SQUID multiplexer read-out system. In this paper, we report on the scientific concept of Super DIOS and the status of its newly developed technologies.