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Lower bounds on photometric redshift errors from Type Ia supernovae templates

Authors
  • Asztalos, S.
  • Nikolaev, S.
  • de Vries, W.
  • Olivier, S.
  • Cook, K.
  • Wang, L.
Type
Preprint
Publication Date
Jul 30, 2009
Submission Date
Jul 30, 2009
Identifiers
DOI: 10.1088/0004-637X/713/2/1167
Source
arXiv
License
Yellow
External links

Abstract

Cosmology with Type Ia supernovae heretofore has required extensive spectroscopic follow-up to establish a redshift. Though tolerable at the present discovery rate, the next generation of ground-based all-sky survey instruments will render this approach unsustainable. Photometry-based redshift determination is a viable alternative, but introduces non-negligible errors that ultimately degrade the ability to discriminate between competing cosmologies. We present a strictly template-based photometric redshift estimator and compute redshift reconstruction errors in the presence of photometry and statistical errors. With reasonable assumptions for a cadence and supernovae distribution, these redshift errors are combined with systematic errors and propagated using the Fisher matrix formalism to derive lower bounds on the joint errors in $\Omega_w$ and $\Omega_w'$ relevant to the next generation of ground-based all-sky survey.

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