Table 5
Physical conditions of respective H II region and adjacent limb-brightened PDR shell in M 42, M 43, and NGC 1977.
| Region | n [cm−3 ] | Tgas [K] | pthermal∕kB [cm−3 K] | G0 | |
|---|---|---|---|---|---|
| Orion Bar | H II | 5 × 103 | 8 × 103 | 8 × 107 | |
| PDR | 6 × 105 | 500 | 3 × 108 | 2 × 104 | |
| Veil shell | Plasma | 0.3 | 2 × 106 | 1 × 106 | |
| H II | 50 | 8 × 103 | 8 × 105 | ||
| PDR | 103−104 | ~100 | 1−10 × 105 | ~100 | |
| M 43 | H II | 500 | 7.5 × 103 | 8 × 106 | |
| PDR | 104 | 100 | 1 × 106 | ~2 × 103 | |
| NGC 1977 | H II | 40 | ~104 | ~8 × 105 | |
| PDR | 103 | 90 | 9 × 104 | ~100 |
Notes. The plasma in M 42 was analyzed by Güdel et al. (2008). Data on the M 42 H II region are from O’Dell & Harris (2010), data on the M 43 H II region are from Simón-Díaz et al. (2011). We note that the density of the M 42 H II region given here is appropriate for the southern EON, as is G0 in the Veil shell PDR.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.