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Photometric redshifts for type Ia supernovae in the supernova legacy survey
2010
Astronomy and Astrophysics
We present a method using the SALT2 light curve fitter to determine the redshift of Type Ia supernovae in the Supernova Legacy Survey (SNLS) based on their photometry in g', r', i' and z'. On 289 supernovae of the first three years of SNLS data, we obtain a precision σ_Δ z/(1+z) = 0.022 on average up to a redshift of 1.0, with a higher precision of 0.016 for z<0.45 and a lower one of 0.025 for z>0.45. The rate of events with |Δ z|/(1+z)>0.15 (catastrophic errors) is 1.4 of catastrophic errors
doi:10.1051/0004-6361/200913283
fatcat:xzjw56d6qvaqtnockoe4wwjfre