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

Rene Fassbender; Jutta Stegmaier; Anne-Marie Weijmans; Stefan Köstner; Andreas Kruselburger; Cornelia Diethart; Peter Fertl; Elisabetta Valiante; Matthew Hayes; Peter Schuecker; Günther Hasinger

doi:10.1117/12.670369

15 June 2006 VADER: a satellite mission concept for high precision dark energy studies

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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Proceedings Volume 6266, Space Telescopes and Instrumentation II: Ultraviolet to Gamma Ray; 626632 (2006) https://doi.org/10.1117/12.670369
Event: SPIE Astronomical Telescopes + Instrumentation, 2006, Orlando, Florida , United States

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.

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Rene Fassbender, Jutta Stegmaier, Anne-Marie Weijmans, Stefan Köstner, Andreas Kruselburger, Cornelia Diethart, Peter Fertl, Elisabetta Valiante, Matthew Hayes, Peter Schuecker, and Günther Hasinger "VADER: a satellite mission concept for high precision dark energy studies", Proc. SPIE 6266, Space Telescopes and Instrumentation II: Ultraviolet to Gamma Ray, 626632 (15 June 2006); https://doi.org/10.1117/12.670369

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KEYWORDS

X-rays

Cameras

Galaxy groups and clusters

Satellites

Galactic astronomy

X-ray optics

Sensors

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