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Table 5.
Electron temperatures and densities.
| Parameter | Diagnostic ratio | M1687* | M2068* | M2538* |
|---|---|---|---|---|
| Te (K) | [O III] (4959/4363) | 12 710 ± 350 | 10 620 ± 260 | 12 120 ± 260 |
| [N II] (5755/6548) | 21 610 ± 4600 | 10 350 ± 800 | 11 930 ± 950 | |
| ne (cm−3) | [S II] (6716/6731) |
 |
19 500 : : |
 |
| [Ar IV] (4711/4740) |
 |
 |
 |
|
| [Cl III] (5518/5538) | – | – | – | |
| M50* | M1596 | M2471 | ||
| Te (K) | [O III] (4959/4363) | 11 480 ± 220 | 11 930 ± 320 | 11 810 ± 240 |
| [N II] (5755/6548) | 12 750 ± 1200 | 11 700 ± 940 | 10 930 ± 890 | |
| ne (cm−3) | [S II] (6716/6731) |
 |
 |
 |
| [Ar IV] (4711/4740) |
 |
 |
 |
|
| [Cl III] (5518/5538) | 24 540 : : | 22 010 : : | – | |
| M2860 | M1074 | M1675 | ||
| Te (K) | [O III] (4959/4363) | 10 010 ± 190 | 11 820 ± 260 | 10 550 ± 450 |
| [N II] (5755/6548) | 12 540 ± 1310 | 12820 ± 2710 | 11 400 ± 1150 | |
| ne (cm−3) | [S II] (6716/6731) |
 |
 |
24 300 : : |
| [Ar IV] (4711/4740) |
 |
 |
 |
|
| [Cl III] (5518/5538) | 9330 : : | – | – | |
Notes. A double colon (“: :”) indicates large uncertainties.
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