11 October 2004 DUO: the Dark Universe Observatory
Author Affiliations +
Dark Energy dominates the mass-energy content of the universe (about 73%) but we do not understand it. Most of the remainder of the Universe consists of Dark Matter (23%), made of an unknown particle. The problem of the origin of Dark Energy has become the biggest problem in astrophysics and one of the biggest problems in all of science. The major extant X-ray observatories, the Chandra X-ray Observatory and XMM-Newton, do not have the ability to perform large-area surveys of the sky. But Dark Energy is smoothly distributed throughout the universe and the whole universe is needed to study it. There are two basic methods to explore the properties of Dark Energy, viz. geometrical tests (supernovae) and studies of the way in which Dark Energy has influenced the large scale structure of the universe and its evolution. DUO will use the latter method, employing the copious X-ray emission from clusters of galaxies. Clusters of galaxies offer an ideal probe of cosmology because they are the best tracers of Dark Matter and their distribution on very large scales is dominated by the Dark Energy. In order to take the next step in understanding Dark Energy, viz. the measurement of the 'equation of state' parameter 'w', an X-ray telescope following the design of ABRIXAS will be accommodated into a Small Explorer mission in lowearth orbit. The telescope will perform a scan of 6,000 sq. degs. in the area of sky covered by the Sloan Digital Sky Survey (North), together with a deeper, smaller survey in the Southern hemisphere. DUO will detect 10.000 clusters of galaxies, measure the number density of clusters as a function of cosmic time, and the power spectrum of density fluctuations out to a redshift exceeding one. When combined with the spectrum of density fluctuations in the Cosmic Microwave Background from a redshift of 1100, this will provide a powerful lever arm for the crucial measurement of cosmological parameters.
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Richard Griffiths, Richard Griffiths, Robert Petre, Robert Petre, Guenther Hasinger, Guenther Hasinger, Peter Predehl, Peter Predehl, Nicholas E. White, Nicholas E. White, Bernd Aschenbach, Bernd Aschenbach, Xavier Barcons, Xavier Barcons, Hans Bohringer, Hans Bohringer, Ulrich G. Briel, Ulrich G. Briel, Lynn Cominsky, Lynn Cominsky, Michael F. Corcoran, Michael F. Corcoran, Udo Dinger, Udo Dinger, Wilhelm J. Egle, Wilhelm J. Egle, Peter Friedrich, Peter Friedrich, Zoltan Haiman, Zoltan Haiman, Robert Hartmann, Robert Hartmann, J. Patrick Henry, J. Patrick Henry, Horst Hippmann, Horst Hippmann, Jim Ingersoll, Jim Ingersoll, Keith Jahoda, Keith Jahoda, Del T. Jenstrom, Del T. Jenstrom, Steven Jordan, Steven Jordan, Eckhard Kendziorra, Eckhard Kendziorra, Günther Kettenring, Günther Kettenring, Walter Kink, Walter Kink, Norbert Meidinger, Norbert Meidinger, Takamitsu Miyaji, Takamitsu Miyaji, Joseph Mohr, Joseph Mohr, Siegfried Mueller, Siegfried Mueller, Richard F. Mushotzky, Richard F. Mushotzky, Elmar Pfeffermann, Elmar Pfeffermann, Peter Schuecker, Peter Schuecker, Axel Schwope, Axel Schwope, Mark Shannon, Mark Shannon, Lothar Strueder, Lothar Strueder, Steven J. Varlese, Steven J. Varlese, "DUO: the Dark Universe Observatory", Proc. SPIE 5488, UV and Gamma-Ray Space Telescope Systems, (11 October 2004); doi: 10.1117/12.552171; https://doi.org/10.1117/12.552171


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