Lower bounds on photometric redshift errors from Type Ia supernovae templates

Details Lower bounds on photometric redshift errors from Type Ia supernovae templates Lower bounds on photometric redshift errors from Type Ia supernovae templates

2009-07-30

arxiv.org/abs/0907.5421v1

Astronomy and Astrophysics

Astrophysics

Instrumentation and Methods for Astrophysics

23 pages, 6 figures

Scientific paper

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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