Star formation in low density HI gas around the elliptical galaxy NGC 2865

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Table 3

Physical parameters derived from spectral lines for the intergalactic Hii regions.

ID	M _{g ′}	N _e	E(B − V)	N₂	O₃N₂	12+log(O/H)
	mag	cm^-3				N₂	O₃N₂

IG_04_main	–15.76	327	0.91	–0.39	0.74	8.67 ± 0.18	8.49 ± 0.1
IG_04_tail	–15.31	90	0.84	–0.54	1.01	8.58 ± 0.18	8.40 ± 0.14
IG_17_P1	–	–	0.70^*	–0.58	–	8.56 ± 0.18	–
IG_51_P3	–14.58	–	0.33	–0.54	–	8.58 ± 0.18	–
IG_85_P6	–14.22	176	0.70^*	–0.54	—	8.58 ± 0.18	–
IG_52_P7	–14.51	176	0.75	–0.65	1.29	8.52 ± 0.18	8.31 ± 0.14

Notes.

^(*)

Given that the Hβ emission line was not detected in two cases, the color excess, E(B − V), was assumed to be an average of the values derived for the other four spectra.

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