A study of interacting galaxies from the Arp-Madore catalog - Triggering of star formation and nuclear activity

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Table 4.

Ionized gas and stellar population properties of SF galaxies of the INT and CTR samples classified in Sect. 5.

	SF INT (20 galaxies)		SF CTR (7 galaxies)		INT/CTR

Property	$\bar{p} \pm σ$ $\bar{p} \pm \sigma$	median ± Q.D.	$\bar{p} \pm σ$ $\bar{p} \pm \sigma$	median ± Q.D.	Fraction	KS p-value
Ionized gas
EW(Hα) (Å)	77 ± 90	40 ± 28	19 ± 10	19 ± 4	2.08	5.4e−04
log(sSFR/yr⁻¹) ^(a)	−9.6 ± 0.5	−9.8 ± 0.3	−10.3 ± 0.3	−10.2 ± 0.2	0.96	5.4e−04
sSFR (yr⁻¹) ^(a)	5e−10 ± 8e−10	2e−10 ± 2e−10	7e−11 ± 5e−11	7e−11 ± 2e−11	2.63	5.4e−04
1/sSFR (Gyr) ^(a)	6 ± 5	6 ± 3	26 ± 20	15 ± 10	0.38	5.4e−04

Stellar population modeling
⟨t_⋆⟩_L^(b)	8.2 ± 0.7	8.0 ± 0.6	9.0 ± 0.4	9.1 ± 0.2	0.88	1.2e−02
SFR^20 Myr (M_⊙/yr) ^(b)	3 ± 4	2 ± 1	0.6 ± 0.6	0.3 ± 0.4	4.85	6.3e−02
log(sSFR^20 Myr/yr⁻¹) ^(b)	−9.3 ± 0.6	−9.2 ± 0.5	−10.0 ± 0.4	−10.0 ± 0.3	0.92	1.6e−02
sSFR^20 Myr (yr⁻¹) ^(b)	1e−09 ± 1e−09	6e−10 ± 8e−10	1e−10 ± 1e−10	9e−11 ± 8e−11	6.55	1.6e−02
1/sSFR^20 Myr (Gyr) ^(b)	4 ± 5	2 ± 2	13 ± 10	11 ± 7	0.15	1.6e−02

Notes. The columns include the mean ( $\bar{p}$ $\bar{p}$ ), standard deviation (σ), median, and QD for both the INT and CTR samples. The last two columns correspond to the fraction between the median values of the INT and CTR sample and the KS test p-values.

^(a)

The sSFR was obtained from the equation log(sSFR/yr⁻¹) = − 11.87 + 1.32 log(EW(Hα)) from Belfiore et al. (2018).

^(b)

These properties were obtained from the stellar population synthesis modeling. The star formation rate over the last 20 Myr (SFR^20 Myr) was calculated following Riffel et al. (2021, 2023).

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