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Proceedings Paper

VADER: a satellite mission concept for high precision dark energy studies
Author(s): Rene Fassbender; Jutta Stegmaier; Anne-Marie Weijmans; Stefan Köstner; Andreas Kruselburger; Cornelia Diethart; Peter Fertl; Elisabetta Valiante; Matthew Hayes; Peter Schuecker; Günther Hasinger
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Paper Abstract

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 μm (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 0.3μm to 4μm. 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.

Paper Details

Date Published: 15 June 2006
PDF: 14 pages
Proc. SPIE 6266, Space Telescopes and Instrumentation II: Ultraviolet to Gamma Ray, 626632 (15 June 2006); doi: 10.1117/12.670369
Show Author Affiliations
Rene Fassbender, Max-Planck-Institut für extraterrestrische Physik (Germany)
Jutta Stegmaier, Max-Planck-Institut für Astronomie (Germany)
Anne-Marie Weijmans, Leiden Observatory (Netherlands)
Stefan Köstner, Atominstitut der Österreichischen Univ. (Austria)
Andreas Kruselburger, Technische Univ. München, Institute of Astronautics (Germany)
Cornelia Diethart, Institut für Astronomie, Univ. Wien (Austria)
Peter Fertl, Technische Univ. Wien (Austria)
Elisabetta Valiante, Max-Planck-Institut für extraterrestrische Physik (Germany)
Matthew Hayes, Univ. of Stockholm (Sweden)
Peter Schuecker, Max-Planck-Institut für extraterrestrische Physik (Germany)
Günther Hasinger, Max-Planck-Institut für extraterrestrische Physik (Germany)

Published in SPIE Proceedings Vol. 6266:
Space Telescopes and Instrumentation II: Ultraviolet to Gamma Ray
Martin J. L. Turner; Günther Hasinger, Editor(s)

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