Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...203.6405o&link_type=abstract
American Astronomical Society Meeting 203, #64.05; Bulletin of the American Astronomical Society, Vol. 36, p.581
Astronomy and Astrophysics
Astronomy
Scientific paper
DIOS is a relatively small Japanese X-ray mission which will study large-scale distribution of the warm-hot intergalactic medium using OVII and OVIII emission lines. The 3-axis stabilized satellite weighing 300-400 kg is equipped with a 4-stage reflection telescope and a TES microcalorimeter array. The combination of these instruments gives an effective area larger than 100 cm2 at the Oxygen line energy ( ˜ 0.6 keV), a field of view about 40 arcmin FWHM, and an energy resolution about 2 eV. The basic design of the telescope is a thin-foil mirror type which is the same as those employed in ASCA and Astro-E2 missions and gives a large effective area with moderate angular resolution. With the introduction of the 4-sage mirrors, the focal length is as short as 70 cm and a 1 cm scale at the focal plane covers a sky area about 50 arcmin across. The outer diameter of the mirror is about 50 cm. The TES microcalorimeter provides the large field of view and good energy resolution at the same time. We plan to install an array comprising 16 x 16 pixels with an overall size of 1 cm square. The instrument will enable us to map the sky with about 3 arcmin angular resolution. The DIOS proposal will be reviewed in the new Japanese space organization JAXA, and we are aiming at the launch to take place around 2008-2009.
DIOS Team
Mitsuda Kazu
Ohashi Takuma
Suto Yasushi
Tawara Yuzura
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