Other
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aps..apr.r4003b&link_type=abstract
American Physical Society, April Meeting, 2003, April 5-8, 2003 Philadelphia, Pennsylvania, MEETING ID: APR03, abstract #R4.003
Other
Scientific paper
XEUS is a major X-ray observatory currently under study by ESA (Europe) and ISAS (Japan). Its main scientific driver is the study of the most distant hot Universe and its evolution. In particular XEUS will study the formation of the first accreting massive black holes in the Universe and their relation to galaxy formation; the assembly of the first gravitationally bound structures (groups and clusters); the filamentary structures full of warm and hot baryons left in between the galaxies and clusters; the chemical evolution of the Universe and the origin of the element enrichment and finally all types of Astrophysical studies of nearby sources, including Galactic and extragalactic accreting sources. To achieve these goals XEUS will have two spacecrafts kept 50m apart by an active system. The mirror module will initially have 6 m^2 at 1 keV and 3m^2 at 8 keVm with an angular resolution of 2-5 arcsec. Following a visit to the International Space Station, the mirrors will be grown to an effective area of 30 m^2 at 1 keV necessary to explore the most distant Universe. The detector spacecraft, that will be renewed every 4-5 years, will contain two types of instruments. On the one hand, a non-dispersive cryogenic imaging spectrograph of moderate field of view (1 arcmin) and spectral resolution R ˜ 1000 over the range 0.1-15 keV; on the other hand a wide-field imager, with a field of view of up to 15 arcmin, but semiconductor-based spectral resolution which might be equipped with supplementary devices such as a high energy detector (up to 40-50 keV) and high count-rate detectors for timing studies of bright sources. XEUS is expected to be ready for launch soon after 2012.
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