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Survey Requirements for Accurate and Precise Photometric Redshifts for Type Ia Supernovae | | Yun Wang
; Gautham Narayan
; Michael Wood-Vasey
; | | Date: |
1 Aug 2007 | | Abstract: | In this letter we advance the simple analytic photometric redshift estimator
for Type Ia supernovae (SNe Ia) proposed by Wang (2007), and use it to study
simulated SN Ia data. We find that better than 0.5% accuracy in z_phot (with
RMS[(z_phot-z_spec)/(1+z_spec)]<0.005) is possible for SNe Ia with well sampled
lightcurves in three observed passbands (riz) with a signal-to-noise ratio of
25 at peak brightness, if the extinction by dust is negligible. The
corresponding bias in z_phot (the mean of (z_phot-z_spec)) is 5.4 imes
10^{-4}. If dust extinction is taken into consideration in the riz
observer-frame lightcurves, the accuracy in z_phot deteriorates to 4.4%, with a
bias in z_phot of 8.0 imes 10^{-3}. Adding the g band lightcurve improves the
accuracy in z_phot to 2.5%, and reduces the bias in z_phot to -1.5 imes
10^{-3}. Our results have significant implications for the design of future
photometric surveys of SNe Ia from both ground and space telescopes. Accurate
and precise photometric redshifts boost the cosmological utility of such
surveys. | | Source: | arXiv, 0708.0033 | | Services: | Forum | Review | PDF | Favorites | |
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