Table 2
Observations and predictions for the ionized and neutral gas models of I Zw 18.
| Observations | Observed value | MI,opt | MI,opt+IR | MNA | MNM |
|---|---|---|---|---|---|
| S26716.44A | 22.50 ± 7.00 |  |
 |
 |
 |
| S26730.82A | 16.90 ± 7.00 |  |
 |
 |
 |
| H14101.73A | 266.00 ± 26.60 |  |
 |
 |
 |
| H14340.46A | 461.00 ± 46.10 |  |
 |
 |
 |
| H14861.33A | 1000.00 ± 100.00 |  |
 |
 |
 |
| H16562.81A | 2860.00 ± 286.00 |  |
 |
 |
 |
| He14471.49A | 21.40 ± 2.14 |  |
 |
 |
 |
| He15875.64A | 67.70 ± 6.77 |  |
 |
 |
 |
| He16678.15A | 25.30 ± 2.53 |  |
 |
 |
 |
| He17065.22A | 24.40 ± 2.44 |  |
 |
 |
 |
| He24685.64A | 36.80 ± 3.68 |  |
 |
 |
 |
| N26548+84A | 9.20 ± 2.00 |  |
 |
 |
 |
| O23726+9A | 238.00 ± 23.80 |  |
 |
 |
 |
| O35007+4959A | 2683.00 ± 268.30 |  |
 |
 |
 |
| Ne33869+968A | 191.00 ± 19.10 |  |
 |
 |
 |
| Ar37135+751A | 23.50 ± 2.35 |  |
 |
 |
 |
| Fe34658.01A | 4.50 ± 2.00 |  |
 |
 |
 |
| O388.3323m | 200.00 ± 30.00 | ( ) |
 |
 |
 |
| H112.3684m | 8.50 ± 3.00 | ( ) |
 |
 |
 |
| O425.8832m | 38.00 ± 8.00 | ( ) |
 |
 |
 |
| Ne212.8101m | 6.00 ± 3.00 | ( ) |
 |
 |
 |
| Ne315.5509m | 47.00 ± 10.00 | ( ) |
 |
 |
 |
| Ne336.0036m | <7.00 | ( ) |
 |
 |
 |
| Ne514.3228m | <2.30 | ( ) |
 |
 |
 |
| Ne524.2065m | <4.00 | ( ) |
 |
 |
 |
| S318.7078m | 28.00 ± 7.00 | ( ) |
 |
 |
 |
| S333.4704m | 40.00 ± 7.00 | ( ) |
 |
 |
 |
| S410.5076m | 49.00 ± 10.00 | ( ) |
 |
 |
 |
| Ar26.98337m | <5.00 | ( ) |
 |
 |
 |
| Ar321.8253m | <8.00 | ( ) |
 |
 |
 |
| Ar38.98898m | <10.00 | ( ) |
 |
 |
 |
| Fe322.9190m | <6.00 | ( ) |
 |
 |
 |
| LTIR500.500m | 28084.00 ± 2808.40 | ( ) |
( ) |
 |
 |
| C2157.636m | 76.00 ± 20.00 | ( ) |
( ) |
 |
 |
| O163.1679m | 60.00 ± 20.00 | ( ) |
( ) |
 |
 |
| Si234.8046m | 65.00 ± 12.00 | ( ) |
( ) |
 |
 |
| Fe217.9314m | <3.00 | ( ) |
( ) |
 |
 |
| Fe225.9811m | 13.00 ± 8.00 | ( ) |
( ) |
 |
 |
| CO2600.05m | 1.50 ± 0.50 × 10−04 | ( ) |
( ) |
 |
 |
| H22.12099m | <2.00 | ( ) |
( ) |
 |
 |
| H228.2130m | <7.00 | ( ) |
( ) |
 |
 |
| H212.2752m | <7.50 | ( ) |
( ) |
 |
 |
| H217.0300m | <7.00 | ( ) |
( ) |
 |
 |
| O16300+63A | 8.50 ± 2.00 | ( ) |
( ) |
( ) |
( ) |
| O27320+30A | 6.30 ± 2.00 | ( ) |
( ) |
( ) |
( ) |
| O34363.21A | 65.90 ± 6.59 | ( ) |
( ) |
( ) |
( ) |
| S24068.60A | 3.70 ± 1.00 | ( ) |
( ) |
( ) |
( ) |
| S36312.06A | 6.70 ± 2.00 | ( ) |
( ) |
( ) |
( ) |
| Ar44740.12A | 4.50 ± 3.00 | ( ) |
( ) |
( ) |
( ) |
| Fe34987.33A | 7.40 ± 3.00 | ( ) |
( ) |
( ) |
( ) |
| Fe54227.19A | 1.80 ± 0.70 | ( ) |
( ) |
( ) |
( ) |
Notes. Fluxes normalized to Hβ = 1000 need to be scaled by 4.56 × 1036 to convert to luminosity in erg s−1. Values in parentheses correspond to predicted observations. Model MI,opt considers only optical ionized gas observations, MI,opt+IR considers infrared lines as additional observations, MNA considers all lines tracing the ionized and neutral atomic gas (CO is only used as an upper limit), and MNM considers the neutral molecular gas.
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