2013/09/20 by J. Newman, Jeffrey A. Newman, Alexandra Abate +110 · 100 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics #Baryon acoustic oscillations #Calibration #Cosmology #Cosmology and Gravitation Theories #Dark energy #Energy (signal processing) #Galaxies: Formation, Evolution, Phenomena #Galaxy #Photometric redshift #Physics #Redshift #Redshift survey #Redshift-space distortions #astro-ph.CO
paper · pdf · open access · doi:10.1016/j.astropartphys.2014.06.007
published in Astroparticle Physics 63, 81-100 (Elsevier BV) · White paper for the "Dark Energy and CMB" working group for the American Physical Society's Division of Particles and Fields long-term planning exercise ("Snowmass")
arxiv created 2013/09/20 · openalex publication_date 2014/07/05 · arxiv updated 2016/05/25 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Large sets of objects with spectroscopic redshift measurements will be needed for imaging dark energy experiments to achieve their full potential, serving two goals:training_, i.e., the use of objects with known redshift to develop and optimize photometric redshift algorithms; andcalibration_, i.e., the characterization of moments of redshift (or photo-z error) distributions. Better training makes cosmological constraints from a given experiment stronger, while highly-accurate calibration is needed for photo-z systematics not to dominate errors. In this white paper, we investigate the required scope of spectroscopic datasets which can serve both these purposes for ongoing and next-generation dark energy experiments, as well as the time required to obtain such data with instruments available in the next decade. Large time allocations on kilo-object spectrographs will be necessary, ideally augmented by infrared spectroscopy from space. Alternatively, precision calibrations could be obtained by measuring cross-correlation statistics using samples of bright objects from a large baryon acoustic oscillation experiment such as DESI. We also summarize the additional work on photometric redshift methods needed to prepare for ongoing and future dark energy experiments.