Table 2
Standardization fit results.
Fit parameters | SNe | χ2 | χ2 ∕dof | HR RMS (mag) | Host mass step (mag) | LsSFR step (mag) |
---|---|---|---|---|---|---|
x1 | 73 | 70.76 | 1.00 | 0.135 ± 0.011 | 0.098 ± 0.031 | − 0.151 ± 0.028 |
uTi@p6 | 57 | 44.18 | 0.80 | 0.116 ± 0.011 | 0.042 ± 0.031 | − 0.075 ± 0.031 |
x1 (cut) | 43 | 43.22 | 1.05 | 0.136 ± 0.015 | 0.094 ± 0.037 | − 0.156 ± 0.035 |
uTi@p6 (cut) | 43 | 27.21 | 0.66 | 0.105 ± 0.012 | 0.034 ± 0.033 | − 0.068 ± 0.034 |
x1 + uCa@m6 | 52 | 40.90 | 0.83 | 0.122 ± 0.012 | 0.081 ± 0.033 | − 0.138 ± 0.030 |
uTi@p6 + uCa@m6 | 43 | 18.22 | 0.46 | 0.086 ± 0.010 | 0.022 ± 0.030 | − 0.065 ± 0.030 |
Notes. The first column shows which standardization parameters are included (in addition to SALT2.4 color), where cut fits are restricted to SNe with measurements both at pre-peak and post-peak phases. The number of SNe included is given in the second column. The intrinsic dispersion was fixed to 0.090 mag for all runs. The size of a step based on global host-galaxy mass or local age (LsSFR) were calculated as in R17 and are shown in the final two columns.
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