Status of the DIOS mission

Abstract

We present the current status of a small X-ray mission DIOS (Diffuse Intergalactic Oxygen Surveyor), consisting of a 4-stage X-ray telescope and an array of TES microcalorimeters, cooled with mechanical coolers, with a total weight of about 400 kg. The mission will perform survey observations of warm-hot intergalactic medium using OVII and OVIII emission lines, with the energy coverage up to 1.5 keV. The wide field of view of about 50' diameter, superior energy resolution close to 2 eV FWHM, and very low background will together enable us a wide range of science for diffuse X-ray sources. We briefly describe the current status of the development of the satellite, and the subsystems.

DIOS: the dark baryon exploring mission

“…The concept and design of DIOS (Diffuse Intergalactic Oxygen Surveyor) has been reported in the past SPIE conference papers for several times. [4][5][6][7] A special feature of the DIOS mission is a wide-field X-ray spectroscopy using an array of microcalorimeters, enabling the detection of WHIM in emission. A detailed simulation has been carried out assuming a few times larger X-ray telescope, 8 and the results can be easily scaled to DIOS observations since influence of non-X-ray background will be negligible.…”