Estimating infall times of galaxies around clusters: Working to achieve accurate results based on observational data

Open Access

Table 1.

Infall time estimates in eight zones of the linear partition.

Zone	Range ^a	Median t_fall ^b	RMSE_median ^c	t₁ ^d	t₂ ^d	RMSE_two ^e	f₁ : f₂ ^f	f_intl ^g
1	0.000 < d_linear < 0.325	9.90	2.57	7.37	11.18	1.40	0.47:0.53	0.00
2	0.325 < d_linear < 0.650	8.82	2.71	5.04	9.72	1.47	0.29:0.73	0.01
3	0.650 < d_linear < 0.975	7.28	2.70	4.09	8.62	1.44	0.35:0.65	0.03
4	0.975 < d_linear < 1.300	5.37	2.45	3.99	7.70	1.32	0.52:0.48	0.07
5	1.300 < d_linear < 1.625	4.90	2.20	2.92	5.78	1.43	0.31:0.69	0.18
6	1.625 < d_linear < 1.950	4.08	2.19	1.91	5.62	1.08	0.42:0.58	0.37
7	1.950 < d_linear < 2.275	1.98	2.58	1.47	5.56	1.09	0.62:0.38	0.60
8	2.275 < d_linear < 2.600	1.34	1.54	1.22	4.21	0.81	0.81:0.19	0.85

Notes.

^(a)

The range of each zone. d_linear is calculated through Equation (6).

^(b)

The median infall time in each zone, in Gyr.

^(c)

The RMSE relative to the median infall time in each zone, in Gyr.

^(d)

The two infall time estimates obtained by GMM, in Gyr.

^(e)

The RMSE calculated with the smaller one of the two errors relative to the two estimates in each zone, in Gyr.

^(f)

The relative proportion of two Gaussian components given by GMM.

^(g)

The fraction of interlopers in each zone.

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