Photometric redshifts for type Ia supernovae in the supernova legacy survey

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Table 1:

Accuracy $\sigma _{\Delta z/(1+z)}$ of the supernova photometric redshift ${z_{\rm pho}}$ .
	Simulation		Data
Performance			Spec. Ia	All Ia	Spec. Ia	All Ia	All Ia
criteria	${z_{\rm pho}}$ ^a	${z_{\rm pho}}$ ^b	${z_{\rm pho}}$ ^a	${z_{\rm pho}}$ ^a	${z_{\rm pho}}$ ^b	${z_{\rm pho}}$ ^b	$z_{\rm gal}$
	(1)	(2)	(3)	(4)	(5)	(6)	(7)
$\sigma _{\Delta z/(1+z)}$ for z<0.45	0.006	0.006	0.018	0.019	0.014	0.016	0.031
$\sigma _{\Delta z/(1+z)}$ for z>0.45	0.029	0.027	0.024	0.027	0.020	0.025	0.037
Outlier rate $\eta$	2.5%	1.0%	2.0%	3.1%	0.4%	1.4%	5.5%

Notes. Columns 1 and 2 are for simulated events, Cols. 3 to 6 for data. For comparison, Col. 7 indicates the accuracy of the photometric redshift of the host galaxy $z_{\rm gal}$ . The data sample contains 57 objects at ${z_{\rm spe}}<0.45$ of which 50 are spectroscopically confirmed, and 232 at ${z_{\rm spe}}>0.45$ including 191 spectroscopically confirmed SNe Ia. Superscript ^(b) if bounds and prior on redshift used (as explained in Sect. 3), ^(a) otherwise.

Source LaTeX | All tables | In the text

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