Retrieval of the physical parameters of galaxies from WEAVE-StePS-like data using machine learning

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Volume 690 (October 2024)

A&A, 690 (2024) A198

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Table 1.

Average statistics in all bins at different combinations of redshifts and S/Ns.

	Random forest			K-Nearest neighbour
Physical Parameter	Bias	σ	f_outlier (%)	Bias	σ	f_outlier (%)

z = 0.3, S/N = 10
log t_mwa [yr]	0.00 $_{- 0.03}^{+ 0.05}$ $_{-0.03}^{+0.05}$	0.10 $_{- 0.01}^{+ 0.02}$ $_{-0.01}^{+0.02}$	4.94	−0.01 $_{- 0.07}^{+ 0.08}$ $_{-0.07}^{+0.08}$	0.16 $_{- 0.04}^{+ 0.03}$ $_{-0.04}^{+0.03}$	3.15
log t_uwa [yr]	0.01 $_{- 0.01}^{+ 0.01}$ $_{-0.01}^{+0.01}$	0.08 $_{- 0.02}^{+ 0.02}$ $_{-0.02}^{+0.02}$	5.38	−0.03 $_{- 0.02}^{+ 0.02}$ $_{-0.02}^{+0.02}$	0.11 $_{- 0.01}^{+ 0.02}$ $_{-0.01}^{+0.02}$	4.74
log Z/Z_⊙	0.01 $_{- 0.03}^{+ 0.01}$ $_{-0.03}^{+0.01}$	0.14 $_{- 0.02}^{+ 0.02}$ $_{-0.02}^{+0.02}$	7.37	0.00 $_{- 0.01}^{+ 0.05}$ $_{-0.01}^{+0.05}$	0.20 $_{- 0.02}^{+ 0.01}$ $_{-0.02}^{+0.01}$	5.87
log sSFR [yr⁻¹]	−0.03 $_{- 0.80}^{+ 0.05}$ $_{-0.80}^{+0.05}$	0.4 $_{- 0.3}^{+ 0.1}$ $_{-0.3}^{+0.1}$	9.28	−0.1 $_{- 0.7}^{+ 0.2}$ $_{-0.7}^{+0.2}$	0.45 $_{- 0.26}^{+ 0.09}$ $_{-0.26}^{+0.09}$	7.90
A_V	0.00 $_{- 0.08}^{+ 0.01}$ $_{-0.08}^{+0.01}$	0.09 $_{- 0.02}^{+ 0.04}$ $_{-0.02}^{+0.04}$	11.80	−0.1 $_{- 0.2}^{+ 0.1}$ $_{-0.2}^{+0.1}$	0.13 $_{- 0.02}^{+ 0.02}$ $_{-0.02}^{+0.02}$	5.06
log t_mod/τ	0.1 $_{- 0.2}^{+ 0.7}$ $_{-0.2}^{+0.7}$	0.27 $_{- 0.06}^{+ 0.05}$ $_{-0.06}^{+0.05}$	7.40	0.1 $_{- 0.3}^{+ 0.9}$ $_{-0.3}^{+0.9}$	0.23 $_{- 0.03}^{+ 0.07}$ $_{-0.03}^{+0.07}$	5.08

z = 0.3, S/N = 20

log t_mwa [yr]	0.01 $_{- 0.04}^{+ 0.03}$ $_{-0.04}^{+0.03}$	0.09 $_{- 0.01}^{+ 0.03}$ $_{-0.01}^{+0.03}$	5.63	−0.01 $_{- 0.07}^{+ 0.07}$ $_{-0.07}^{+0.07}$	0.14 $_{- 0.04}^{+ 0.01}$ $_{-0.04}^{+0.01}$	3.16
log t_uwa [yr]	0.00 $_{- 0.01}^{+ 0.01}$ $_{-0.01}^{+0.01}$	0.07 $_{- 0.01}^{+ 0.03}$ $_{-0.01}^{+0.03}$	6.63	−0.02 $_{- 0.01}^{+ 0.02}$ $_{-0.01}^{+0.02}$	0.09 $_{- 0.01}^{+ 0.02}$ $_{-0.01}^{+0.02}$	4.88
log Z/Z_⊙	0.01 $_{- 0.02}^{+ 0.01}$ $_{-0.02}^{+0.01}$	0.13 $_{- 0.02}^{+ 0.02}$ $_{-0.02}^{+0.02}$	7.51	0.02 $_{- 0.02}^{+ 0.02}$ $_{-0.02}^{+0.02}$	0.16 $_{- 0.02}^{+ 0.02}$ $_{-0.02}^{+0.02}$	6.14
log sSFR [yr⁻¹]	−0.03 $_{- 0.86}^{+ 0.04}$ $_{-0.86}^{+0.04}$	0.4 $_{- 0.4}^{+ 0.1}$ $_{-0.4}^{+0.1}$	9.95	−0.1 $_{- 0.9}^{+ 0.1}$ $_{-0.9}^{+0.1}$	0.42 $_{- 0.28}^{+ 0.05}$ $_{-0.28}^{+0.05}$	9.15
A_V	0.00 $_{- 0.07}^{+ 0.01}$ $_{-0.07}^{+0.01}$	0.08 $_{- 0.02}^{+ 0.03}$ $_{-0.02}^{+0.03}$	11.63	−0.01 $_{- 0.12}^{+ 0.03}$ $_{-0.12}^{+0.03}$	0.11 $_{- 0.02}^{+ 0.02}$ $_{-0.02}^{+0.02}$	6.49
log t_mod/τ	0.0 $_{- 0.2}^{+ 0.7}$ $_{-0.2}^{+0.7}$	0.27 $_{- 0.06}^{+ 0.06}$ $_{-0.06}^{+0.06}$	7.79	0.1 $_{- 0.3}^{+ 0.9}$ $_{-0.3}^{+0.9}$	0.23 $_{- 0.04}^{+ 0.05}$ $_{-0.04}^{+0.05}$	5.50

z = 0.3, S/N = 30

log t_mwa [yr]	0.00 $_{- 0.03}^{+ 0.03}$ $_{-0.03}^{+0.03}$	0.08 $_{- 0.01}^{+ 0.02}$ $_{-0.01}^{+0.02}$	6.64	−0.01 $_{- 0.06}^{+ 0.06}$ $_{-0.06}^{+0.06}$	0.11 $_{- 0.02}^{+ 0.02}$ $_{-0.02}^{+0.02}$	3.19
log t_uwa [yr]	0.00 $_{- 0.01}^{+ 0.01}$ $_{-0.01}^{+0.01}$	0.06 $_{- 0.01}^{+ 0.02}$ $_{-0.01}^{+0.02}$	6.98	−0.01 $_{- 0.01}^{+ 0.01}$ $_{-0.01}^{+0.01}$	0.08 $_{- 0.01}^{+ 0.02}$ $_{-0.01}^{+0.02}$	4.37
log Z/Z_⊙	0.01 $_{- 0.01}^{+ 0.01}$ $_{-0.01}^{+0.01}$	0.11 $_{- 0.01}^{+ 0.02}$ $_{-0.01}^{+0.02}$	6.11	0.01 $_{- 0.01}^{+ 0.02}$ $_{-0.01}^{+0.02}$	0.12 $_{- 0.01}^{+ 0.02}$ $_{-0.01}^{+0.02}$	5.82
log sSFR [yr⁻¹]	−0.03 $_{- 0.83}^{+ 0.03}$ $_{-0.83}^{+0.03}$	0.4 $_{- 0.3}^{+ 0.1}$ $_{-0.3}^{+0.1}$	10.51	−0.1 $_{- 0.9}^{+ 0.1}$ $_{-0.9}^{+0.1}$	0.4 $_{- 0.3}^{+ 0.1}$ $_{-0.3}^{+0.1}$	9.30
A_V	−0.01 $_{- 0.05}^{+ 0.01}$ $_{-0.05}^{+0.01}$	0.08 $_{- 0.02}^{+ 0.02}$ $_{-0.02}^{+0.02}$	11.32	−0.02 $_{- 0.09}^{+ 0.02}$ $_{-0.09}^{+0.02}$	0.10 $_{- 0.02}^{+ 0.02}$ $_{-0.02}^{+0.02}$	6.77
log t_mod/τ	0.0 $_{- 0.2}^{+ 0.6}$ $_{-0.2}^{+0.6}$	0.26 $_{- 0.06}^{+ 0.06}$ $_{-0.06}^{+0.06}$	8.18	0.1 $_{- 0.3}^{+ 0.9}$ $_{-0.3}^{+0.9}$	0.22 $_{- 0.04}^{+ 0.04}$ $_{-0.04}^{+0.04}$	5.46

z = 0.55, S/N = 10

log t_mwa [yr]	0.00 $_{- 0.03}^{+ 0.03}$ $_{-0.03}^{+0.03}$	0.10 $_{- 0.01}^{+ 0.01}$ $_{-0.01}^{+0.01}$	5.67	0.01 $_{- 0.08}^{+ 0.06}$ $_{-0.08}^{+0.06}$	0.15 $_{- 0.04}^{+ 0.03}$ $_{-0.04}^{+0.03}$	3.63
log t_uwa [yr]	0.00 $_{- 0.01}^{+ 0.00}$ $_{-0.01}^{+0.00}$	0.08 $_{- 0.01}^{+ 0.03}$ $_{-0.01}^{+0.03}$	5.72	−0.03 $_{- 0.02}^{+ 0.04}$ $_{-0.02}^{+0.04}$	0.11 $_{- 0.01}^{+ 0.03}$ $_{-0.01}^{+0.03}$	4.97
log Z/Z_⊙	0.01 $_{- 0.02}^{+ 0.02}$ $_{-0.02}^{+0.02}$	0.17 $_{- 0.03}^{+ 0.03}$ $_{-0.03}^{+0.03}$	8.20	0.02 $_{- 0.02}^{+ 0.08}$ $_{-0.02}^{+0.08}$	0.24 $_{- 0.02}^{+ 0.01}$ $_{-0.02}^{+0.01}$	4.73
log sSFR [yr⁻¹]	0.00 $_{- 0.79}^{+ 0.02}$ $_{-0.79}^{+0.02}$	0.3 $_{- 0.2}^{+ 0.2}$ $_{-0.2}^{+0.2}$	9.86	0.0 $_{- 0.9}^{+ 0.2}$ $_{-0.9}^{+0.2}$	0.5 $_{- 0.3}^{+ 0.1}$ $_{-0.3}^{+0.1}$	8.17
A_V	0.01 $_{- 0.07}^{+ 0.01}$ $_{-0.07}^{+0.01}$	0.08 $_{- 0.02}^{+ 0.03}$ $_{-0.02}^{+0.03}$	12.18	−0.01 $_{- 0.17}^{+ 0.09}$ $_{-0.17}^{+0.09}$	0.13 $_{- 0.01}^{+ 0.01}$ $_{-0.01}^{+0.01}$	4.74
log t_mod/τ	0.0 $_{- 0.2}^{+ 0.7}$ $_{-0.2}^{+0.7}$	0.25 $_{- 0.05}^{+ 0.07}$ $_{-0.05}^{+0.07}$	8.73	0.0 $_{- 0.3}^{+ 0.9}$ $_{-0.3}^{+0.9}$	0.22 $_{- 0.02}^{+ 0.07}$ $_{-0.02}^{+0.07}$	5.40

z = 0.7, S/N = 10

log t_mwa [yr]	0.00 $_{- 0.02}^{+ 0.03}$ $_{-0.02}^{+0.03}$	0.09 $_{- 0.01}^{+ 0.01}$ $_{-0.01}^{+0.01}$	5.93	0.00 $_{- 0.10}^{+ 0.06}$ $_{-0.10}^{+0.06}$	0.13 $_{- 0.04}^{+ 0.02}$ $_{-0.04}^{+0.02}$	4.01
log t_uwa [yr]	0.00 $_{- 0.01}^{+ 0.01}$ $_{-0.01}^{+0.01}$	0.07 $_{- 0.00}^{+ 0.02}$ $_{-0.00}^{+0.02}$	6.02	−0.03 $_{- 0.02}^{+ 0.05}$ $_{-0.02}^{+0.05}$	0.10 $_{- 0.02}^{+ 0.03}$ $_{-0.02}^{+0.03}$	4.39
log Z/Z_⊙	0.02 $_{- 0.02}^{+ 0.01}$ $_{-0.02}^{+0.01}$	0.16 $_{- 0.02}^{+ 0.03}$ $_{-0.02}^{+0.03}$	8.32	0.04 $_{- 0.07}^{+ 0.09}$ $_{-0.07}^{+0.09}$	0.24 $_{- 0.01}^{+ 0.00}$ $_{-0.01}^{+0.00}$	5.00
log sSFR [yr⁻¹]	0.00 $_{- 0.61}^{+ 0.02}$ $_{-0.61}^{+0.02}$	0.3 $_{- 0.2}^{+ 0.3}$ $_{-0.2}^{+0.3}$	9.39	0.0 $_{- 0.9}^{+ 0.1}$ $_{-0.9}^{+0.1}$	0.5 $_{- 0.4}^{+ 0.1}$ $_{-0.4}^{+0.1}$	9.25
A_V	0.01 $_{- 0.07}^{+ 0.01}$ $_{-0.07}^{+0.01}$	0.07 $_{- 0.02}^{+ 0.04}$ $_{-0.02}^{+0.04}$	13.24	−0.01 $_{- 0.16}^{+ 0.08}$ $_{-0.16}^{+0.08}$	0.13 $_{- 0.02}^{+ 0.01}$ $_{-0.02}^{+0.01}$	6.11
log t_mod/τ	0.0 $_{- 0.2}^{+ 0.7}$ $_{-0.2}^{+0.7}$	0.29 $_{- 0.08}^{+ 0.04}$ $_{-0.08}^{+0.04}$	9.01	0.0 $_{- 0.3}^{+ 0.9}$ $_{-0.3}^{+0.9}$	0.22 $_{- 0.04}^{+ 0.06}$ $_{-0.04}^{+0.06}$	5.49

Notes. The left and right set of columns show results for RF and KNN, respectively. The first three sets of rows show results at z = 0.3 for S/N = 10, S/N = 20, and S/N = 30. The bottom two sets of rows show results for S/N = 10 at z = 0.55 and z = 0.7. The leftmost columns indicate the physical parameters of interest for each set of rows. We estimate the bias, the σ, and the percentage of outliers for each algorithm and physical parameter. The uncertainty quoted is the 25^th and 75^th percentiles.

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