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The DUO team

Dark Universe Observatory (DUO).

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The DUO team

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  1. Dark Universe Observatory (DUO) DUO is a candidate for the US Small Explorer (SMEX) program with strong contribution from MPE; Phase A is already finished. Scientific goal is the precise measure of cosmolocical parameters through the 3d-distribution of a large sample of (X-ray detected) clusters of galaxies. • Standard Cosmology (WMAP et al.): • Flat, accelerating universe • Early, rapid expansion (inflation) • 73% Dark Energy, 23% Dark Matter, 4% gas, stars • Seven telescope modules forming hexagonal sky pattern • Uniform sky exposure achieved via scanning • Dark Energy: • is smoothly distributed – needs whole Universe to study it • Conspires with Dark Matter to make Universe ‘flat’ • ‘Deceleration parameter’ is an acceleration, because Dark Energy dominates the universe • Equation of state parameter: pressure vs. density P = wrIf w = -1, DE = Einstein’s ‘Cosmological constant’If w is more negative, Universe will rip apart (the ‘Big Rip’) Mission: • DUO will perform an X-ray sky survey for clusters of galaxies • X-ray data distinguishes clusters of galaxies from Active Galactic Nuclei or stars because clusters are spatially extended • Optical identifications and redshifts will come from the Sloan Digital Sky Survey (Wide Field: 8,000 clusters) and DUO follow-up program (Deep Survey: 1,800 clusters) Zeiss mirrors are near duplicates of ABRIXAS Light paths Instrument Performance: Camera and telescope will be tested and calibrated in the PANTER X-ray facility Camera Head (designed by MPE) with 7 CCD Modules (fabricated in the HLL), each in focus of one mirror module • References: • Griffith et al. 2004, “The Dark Universe Observatory”, SPIE 5488-13 • Friedrich et al. 2004, “The Dark Universe Observatory (DUO): telescope concept”, SPIE 5488-44 • Meidinger et al. 2004, “CCD-detector development for the DUO and ROSITA Mission”, 2004, SPIE 5501-09 • Pfeffermann et al. 2004, “Shielding of cosmic ray induced background in CCD detectors for X-ray astronomy”, SPIE 5501-39 The DUO team

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