Table 3
GMM and Dip test results.
| Target | Color | Ann. | NGC | Blue | Red | fred | Kurt | DD | p(χ2) | p(Dip) |
|---|---|---|---|---|---|---|---|---|---|---|
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) | (11) |
| NGC 3115 | (g − i) | 1 | 166 | 0.765 ± 0.015 | 1.064 ± 0.022 | 0.417 | –0.723 | 3.02 ± 0.43 | 0.001 | 0.78 |
| NGC 3115 | (g − i) | 2 | 116 | 0.743 ± 0.025 | 1.079 ± 0.021 | 0.415 | –0.747 | 3.01 ± 0.45 | 0.010 | 0.95 |
| NGC 1399 | (g − i) | 1 | 103 | 0.834 ± 0.056 | 1.036 ± 0.059 | 0.492 | –0.818 | 2.38 ± 0.34 | 0.275 | 0.02 |
| NGC 1399 | (g − i) | 2 | 149 | 0.777 ± 0.012 | 1.059 ± 0.020 | 0.465 | –1.149 | 3.48 ± 0.35 | 0.001 | 0.81 |
| NGC 3115 | (u − i) | 1 | 166 | 1.909 ± 0.029 | 2.619 ± 0.110 | 0.472 | –0.439 | 2.81 ± 0.75 | 0.001 | 1.00 |
| NGC 3115 | (u − i) | 2 | 116 | 1.883 ± 0.050 | 2.698 ± 0.072 | 0.463 | –0.812 | 2.94 ± 0.36 | 0.014 | 0.83 |
| NGC 1399 | (u − i) | 1 | 103 | 1.992 ± 0.112 | 2.570 ± 0.142 | 0.797 | –0.772 | 2.34 ± 0.34 | 0.077 | 0.50 |
| NGC 1399 | (u − i) | 2 | 149 | 2.079 ± 0.038 | 2.738 ± 0.065 | 0.475 | –0.772 | 2.82 ± 0.40 | 0.001 | 0.81 |
Notes. Columns list: (1–3) Target, color and annulus analyzed; (4) number of GC candidates in the annulus; (5) mean and uncertainty of the first, blue, peak; (6) mean and uncertainty of the second, red, peak; (7) fraction of the GC candidates GMM associated to the second peak; (8−9) kurtosis, Col. (8), and separation, Col. (9), between the peaks in units of the fitted σ parameters. Values of DD larger than ~2, and negative kurtosis are necessary but not sufficient conditions for bimodality; (10) GMM value indicating the significance of the preference for a double Gaussian distribution over a single Gaussian (lower p(χ2) are more significant; p(χ2) close to unity means unimodal distribution is preferred over bimodal); (11) significance level with which a unimodal distribution can be rejected based on the Dip test (high p(Dip) are more significant).
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