The star formation histories of Hickson compact group galaxies

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Table 6

Light-weighted and mass-weighted average stellar ages.

Morphological	Number				Δ ⟨t_⋆⟩_L ± σ	P	S^c			Δ ⟨t_⋆⟩_M ± σ	P	S ^c
class	HCG	CIG	HCG	CIG				HCG	CIG

EtG	79	43	6.0	4.9	1.2 ± 0.6	0.04	2.0σ	9.7	10.7	1.1 ± 0.6	0.06	...
EtS	77	88	3.7	0.9	4.0 ± 0.6	2 × 10^-10	6.8σ	8.5	9.3	1.1 ± 0.5	0.04	2.1σ
LtS (old)	25	155	0.9	0.9	~ 0.1	0.99	...	7.6	8.8	1.2 ± 0.5	0.02	2.4σ
LtS (young)	24	17	0.4	0.3	0.1 ± 0.4	0.73	...	1.2	3.0	2.4 ± 1.1	0.03	2.2σ

Notes. All ages are in units of Gyr.

^(a,b)

These values correspond to the geometric mean of the galaxy ages in each morphological class (i.e. 10^{⟨log t_⋆⟩_L} and 10^{⟨log t_⋆⟩_M}).

^(c)

Values < 2σ are not shown.

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