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VADER: a satellite mission concept for high precision dark energy studies

Fassbender, Rene, Stegmaier, Jutta, Weijmans, Anne-Marie, Köstner, Stefan, Kruselburger, Andreas, Diethart, Cornelia, Fertl, Peter, Valiante, Elisabetta, Hayes, Matthew, Schuecker, Peter and Hasinger, Günther 2006. VADER: a satellite mission concept for high precision dark energy studies. Presented at: Space Telescopes and Instrumentation II: Ultraviolet to Gamma Ray, Orlando, FL, USA, 24 May 2006. Published in: Turner, Martin J. L. and Hasinger, Günther eds. Proc. SPIE 6266, Space Telescopes and Instrumentation II: Ultraviolet to Gamma Ray,. The International Society for Optical Engineering, p. 626632. 10.1117/12.670369

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We present a satellite mission concept to measure the dark energy equation of state parameter ω with percent-level precision. The Very Ambitious Dark Energy Research satellite (VADER) is a multi-wavelength survey mission joining X-ray, optical, and IR instruments for a simultaneous spectral coverage from 4 μ m (0.3 eV) to 10 keV over a field of view (FoV) of 1 square degree. VADER combines several clean methods for dark energy studies, the baryonic acoustic oscillations in the galaxy and galaxy cluster power spectrum and weak lensing, for a joint analysis over an unrivalled survey volume. The payload consists of two XMM-like X-ray telescopes with an effective area of 2,800 cm2 at 1.5 keV and state-of-the-art wide field DEPFET pixel detectors (0.1-10 keV) in a curved focal plane configuration to extend the FoV. The X-ray telescopes are complemented by a 1.5m optical/IR telescope with 8 instruments for simultaneous coverage of the same FoV from 0.3μ m to 4μ m. The 8 dichroic-separated bands (u,g,r,z,J,H,K,L) provide accurate photometric galaxy redshifts, whereas the diffraction-limited resolution of the central z-band allows precise shape measurements for cosmic shear analysis. The 5 year VADER survey will cover a contiguous sky area of 3,500 square degrees to a depth of z ~2 and will yield accurate photometric redshifts and multi-wavelength object parameters for about 175,000 galaxy clusters, one billion galaxies, and 5 million AGN. VADER will not only provide unprecedented constraints on the nature of dark energy, but will additionally extend and trigger a multitude of cosmic evolution studies to very large (>10 Gyrs) look-back times.

Item Type: Conference or Workshop Item (Paper)
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Publisher: The International Society for Optical Engineering
ISSN: 0277-786X
Last Modified: 08 Jan 2020 04:36

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