Table 1.
Best-fit parameters of the dereddened diagnostic emission lines in the optical spectrum of I20210N, I20210S NLR (“N” components) and outflowing emission (“B” components), and emission from the South Nebula (top), and values of the diagnostic line ratios with the corresponding uncertainties (bottom).
| I20210N (χ2/νd.o.f. = 427/405) | I20210S (χ2/νd.o.f. = 442/405) | South Nebula (χ2/νd.o.f. = 228/209) | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Transition | Flux (10−14 erg s−1 cm−2) | FWHM (km s−1) | Flux (10−14 erg s−1 cm−2) | FWHM (km s−1) | Blueshift (km s−1) | Flux (10−14 erg s−1 cm−2) | FWHM (km s−1) | Blueshift (km s−1) | ||
| N | B | N | B | |N–B| | ||||||
| [O II] λλ3726,3729 | 1.060 ± 0.055 | 690 ± 40 | 10.4 ± 1.1 | 10.6 ± 4.4 | 530 ± 90 | * | * | – | – | – |
| [O III] λ4363 | – | – | 0.500 ± 0.054 | 0.42 ± 0.17 | ″ | * | * | – | – | – |
| Hβ | 0.214 ± 0.010 | ″ | 13.72 ± 0.94 | 6.3 ± 2.1 | ″ | 1960 ± 470 | 330 ± 180 | 0.0691 ± 0.0036 | 710 ± 330 | 550 ± 150 |
| [O III] λ5007 | 1.058 ± 0.047 | ″ | 85.2 ± 5.4 | 32.1 ± 9.8 | ″ | 2080 ± 310 | 390 ± 120 | 0.1193 ± 0.0073 | ″ | ″ |
| [O I] λ6300 | 0.193 ± 0.010 | ″ | 4.13 ± 0.20 | 2.39 ± 0.57 | ″ | 1910 ± 350 | 230 ± 150 | – | – | – |
| Hα | 0.623 ± 0.028 | ″ | 42.5 ± 2.0 | 19.5 ± 4.3 | ″ | * | * | 0.1418 ± 0.0071 | ″ | ″ |
| [N II] λ6583 | 0.863 ± 0.039 | ″ | 33.7 ± 1.6 | 8.0 ± 2.2 | ″ | * | * | 0.0334 ± 0.0047 | ″ | ″ |
| [S II] λ6717 | 0.436 ± 0.021 | ″ | 6.80 ± 0.31 | 2.98 ± 0.66 | ″ | * | * | 0.0371 ± 0.0012 | ″ | ″ |
| [S II] λ6731 | 0.366 ± 0.018 | ″ | 7.21 ± 0.32 | 5.0 ± 1.0 | ″ | * | * | 0.0273 ± 0.0010 | ″ | ″ |
| E(B − V) | ∼0 | 0.271 ± 0.019 | 0.195 ± 0.091 | ∼0 | ||||||
| I20210N |
I20210S |
Outflow |
South Nebula |
|||||||
| Ratio | Value | Uncertainty | Value | Uncertainty | Value | Uncertainty | Value | Uncertainty | ||
| log( [O III]/Hβ) | 0.686 | 0.040 | 0.798 | 0.061 | 0.71 | 0.28 | 0.237 | 0.049 | ||
| log( [N II]/Hα) | 0.142 | 0.039 | −0.114 | 0.044 | −0.39 | 0.21 | −0.628 | 0.083 | ||
| log( [S II]/Hα) | 0.110 | 0.041 | −0.489 | 0.044 | −0.39 | 0.19 | −0.343 | 0.037 | ||
| log([O I]/Hα) | −0.509 | 0.042 | −0.933 | 0.052 | −0.91 | 0.20 | – | – | ||
| log([O II]/Hβ) | 0.695 | 0.043 | −0.120 | 0.077 | 0.23 | 0.33 | – | – | ||
| log([O III]/[O II]) | −0.001 | 0.042 | 0.913 | 0.073 | 0.48 | 0.31 | – | – | ||
Notes. The integrated fluxes presented here have been dereddened by the indicated amount of E(B − V) with the SMC extinction by Pei (1992). ( − )Transition not detected in the spectrum.
(″)Value fixed to be equal to the first non-null one upwards in the column.
( * )Value anchored to the best fit of the [O III] λ5007 broad component.
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