Wide-field spectroscopy and imaging at two plate scales with a focal three mirror anastigmat

Michael J. Sholl; David A. Content; Michael L. Lampton; John P. Lehan; Michael E. Levi

doi:10.1117/12.857762

5 August 2010 Wide-field spectroscopy and imaging at two plate scales with a focal three mirror anastigmat

Michael J. Sholl, David A. Content, Michael L. Lampton, John P. Lehan, Michael E. Levi

Proceedings Volume 7731, Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave; 77311F (2010) https://doi.org/10.1117/12.857762
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

Abstract

The key enabling element of the Joint Dark Energy Mission (JDEM)^1,2,3 is a wide-field, high-magnification mixed spectroscopic and imaging telescope intended to study dark energy via measurement of the expansion history of the universe and the growth of large-scale structure. It is designed to provide tight constraints on the equation of state of dark energy and test the validity of general relativity. Complementary observation of Baryon Acoustic Oscillations (BAO), Type 1a Supernovae (SNe) and Gravitational Weak Lensing (WL) are under consideration for the mission. The science goals of this mission call for a high-resolution imaging survey and a spectroscopic survey of at least 10,000 square degrees. Signal to noise requirements of the Baryon Acoustic Oscillation (BAO) survey favor a prism disperser with a λ • d θ /d λ of roughly 200 arcsec and a coarse plate scale (~0.45arsec/pixel). The WL imaging survey seeks the shapes of galaxies, and therefore prefers a finer plate scale of ~0.1-0.23 arcsec/pixel. Accommodation all of these goals may be accomplished with an afocal telescope but the results of this study suggest that a focal telescope is also capable of achieving these goals. Discussed herein are several novel prism concepts designed for use in a focal three mirror anastigmat telescope (TMA). Multiple elements are used for aberration balancing and tailoring resolving power over the observational band. Several options for simultaneous or staggered imaging and spectroscopy as well as the required plate scale change with a focal TMA are presented.

Citation Download Citation

Michael J. Sholl, David A. Content, Michael L. Lampton, John P. Lehan, and Michael E. Levi "Wide-field spectroscopy and imaging at two plate scales with a focal three mirror anastigmat", Proc. SPIE 7731, Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave, 77311F (5 August 2010); https://doi.org/10.1117/12.857762

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