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Table 5

O/H, N/H and N/O abundance ratios from the literature and this work for various regions across the starburst.

D a 12+log(O/H) 12+log(N/H) log(N/O)
arcsec(pc)

Walsh & Roy (1989)
Region 2 6.68(123) 8.22 ± 0.09 6.87 ± 0.05 −1.35 ± 0.05
Region 4 9.09(167) 8.22 ± 0.08 6.78 ± 0.05 −1.43 ± 0.05
Region 5 6.90(127) 8.12 ± 0.06 6.80 ± 0.04 −1.32 ± 0.04
Region 6 7.83(144) 8.05 ± 0.07 6.82 ± 0.04 −1.23 ± 0.04
Region 7 12.70(234 ) 7.96 ± 0.07 6.65 ± 0.04 −1.31 ± 0.04
Kobulnicky et al. (1997)
HII-1 1.50(28) 8.12 ± 0.05 b −0.83 ± 0.09
HII-2 1.75(32) 8.19 ± 0.07 b −0.86 ± 0.10
UV1 2.70(50) 8.16 ± 0.12 b −1.29 ± 0.13
Lopez-Sanchez et al. (2007)
Knot A 1.57(29) 8.45 ± 0.12 7.54 ± 0.14 −0.91 ± 0.18
Knot B 0.76(14) 8.37 ± 0.13 7.40 ± 0.15 −0.97 ± 0.19
Knot C 2.80(52) 8.54 ± 0.11 7.08 ± 0.15 −1.50 ± 0.08
Knot D 7.20(132) 8.31 ± 0.07 6.82 ± 0.07 −1.49 ± 0.10
Monreal-Ibero et al. (2012)
Knot 1 0.00(0) 8.24 ± 0.09 7.43 ± 0.07 −0.81 ± 0.25
Knot 2 2.80(51) 8.32 ± 0.04 6.94 ± 0.03 −1.37 ± 0.11
Knot 3 7.21(133) 8.26 ± 0.08 7.00 ± 0.06 −1.26 ± 0.22
This work - Position 3
Region 1 7.4(136) 8.40 ± 0.10 6.70 ± 0.06 –1.70 ± 0.12
Region 2 8.3(153) 8.16 ± 0.18 6.61 ± 0.12 –1.55 ± 0.21
Region 3 9.5(175) 8.11 ± 0.21 6.68 ± 0.15 –1.43 ± 0.26
Region d_3 9.6(177) 8.27 ± 0.04 6.79 ± 0.04 –1.48 ± 0.05
This work – Position 4
Region 4 10.9(200) 8.40 ± 0.02 6.86 ± 0.02 –1.53 ± 0.03
Region 5 10.3(189) 8.65 ± 0.34 7.04 ± 0.20 –1.61 ± 0.39
Region 6 13.3(245) 8.20 ± 0.13 6.58 ± 0.07 –1.62 ± 0.15
Region d_4 11.7(215) 8.42 ± 0.14 6.91 ± 0.11 –1.52 ± 0.18

Notes.The nomenclature is from the respective papers. These values were used to create the plots in Fig. 10.

(a)

Projected distance from the supernebula.

(b)

These authors measured the N/O ratio directly from the intensity of [N ii]λ6584 and [O ii]λ3727 since they did not detect sufficient lines to measure the N abundance itself.

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