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6 July 2018 Super DIOS: future x-ray spectroscopic mission to search for dark baryons
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Abstract
We are working on an updated program of the future Japanese X-ray satellite mission DIOS (Diffuse Intergalactic Oxygen Surveyor), called Super DIOS. We keep the main aim of searching for dark baryons in the form of warmhot intergalactic medium (WHIM) with high-resolution X-ray spectroscopy. The mission will detect redshifted emission lines from OVII, OVIII and other ions, leading to an overall understanding of the physical nature and spatial distribution of dark baryons as a function of cosmological timescale. We are working on the conceptual design of the satellite and onboard instruments, with a provisional launch time in the early 2030s. The major changes will be improved angular resolution of the X-ray telescope and increased number of TES calorimeter pixels. Super DIOS will have a 10-arcsecond resolution and a few tens of thousand TES pixels. Most contaminating X-ray sources will be resolved, and the level of diffuse X-ray background will be reduced after subtraction of point sources. This will give us very high sensitivity to map out the WHIM in emission. The status of the spacecraft study will be presented: the development plan of TES calorimeters, on-board cooling system, X- ray telescope, and the satellite system. The previous study results for DIOS and technical achievements reached by the Hitomi (ASTRO-H) mission provide baseline technology for Super DIOS. We will also consider large scale international collaboration for all the on-board instruments.
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
T. Ohashi, Y. Ishisaki, Y. Ezoe, S. Yamada, R. Hayakawa, K. Nunomura, K. Sato, Y. Tawara, I. Mitsuishi, K. Ohtsuka, K. Mitsuda, N. Y. Yamasaki, T. Kikuchi, T. Hayashi, H. Muramatsu, Y. Nakashima, N. Ota, K. Osato, Y. Ichinohe, M. E. Eckart, S. R. Bandler, R. L. Kelley, and C. A. Kilbourne "Super DIOS: future x-ray spectroscopic mission to search for dark baryons", Proc. SPIE 10699, Space Telescopes and Instrumentation 2018: Ultraviolet to Gamma Ray, 1069928 (6 July 2018); https://doi.org/10.1117/12.2313122
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