Table 3
Selected regions and their fundamental properties.
Region | Explicit mask | Approx. size | Column density range | Median column density | Temperature range | Median temperature | Label (†) |
---|---|---|---|---|---|---|---|
[arcmin2] | [cm−2] | [cm−2] | [K] | [K] | |||
All averaged | No mask | 210.0 | 9.3 × 1020−>1.4 × 1023 (*) | 1.0 × 1022 (*) | 17–53 (*) | 25 (*) | 1 |
High column density | N ≥ 3.6 × 1022 cm−2 | 23.3 | 3.6 × 1022−>1.4 × 1023 (*) | 4.9 × 1022 (*) | 17–51 (*) | 27 (*) | 2 |
High column density without | N ≥ 3.6 × 1022 cm−2 | 21.5 | 3.6 × 1022−1.4 × 1023 | 4.9 × 1022 | 17–51 | 27 | 3 |
KL and Orion South | |||||||
High column density, | N ≥ 3.6 × 1022 cm−2 | 9.2 | 3.6 × 1022−9.3 × 1022 | 4.7 × 1022 | 17–<25 | 19 | 4 |
low temperature | T < 25 K | ||||||
High column density, high | N ≥ 3.6 × 1022 cm−2 | 11.5 | 3.6 × 1022−1.4 × 1023 | 5.5 × 1022 | 26–51 | 32 | 5 |
temperature, without KL | 25 < T < 55 K | ||||||
and Orion South | |||||||
Low column density | N < 3.6 × 1022 cm−2 | 186.7 | 9.3 × 1020−<3.6 × 1022 | 9.0 × 1021 | 17–53 | 25 | 6 |
Low temperature | T < 25 K | 102.1 | 2.1 × 1021−9.3 × 1022 | 1.2 × 1022 | 17–<25 | 21 | 7 |
Low column density, | N < 3.6 × 1022 cm−2 | 92.9 | 2.1 × 1021−<3.6 × 1022 | 1.1 × 1022 | 17–<25 | 22 | 8 |
low temperature | T < 25 K | ||||||
Low column density, | N < 3.6 × 1022 cm−2 | 93.7 | 9.3 × 1020−<3.6 × 1022 | 7.5 × 1021 | 25–53 | 34 | 9 |
high temperature | 25 < T < 55 K | ||||||
High temperature, | 25 < T < 55 K | 105.2 | 9.3 × 1020−1.4 × 1023 | 8.5 × 1021 | 25–53 | 33 | 10 |
without KL and Orion South | |||||||
H II | High H31α emission (**) | 6.4 | 7.9 × 1021−6.7 × 1022 (*) | 1.7 × 1022 (*) | 36–51(*) | 42 | 11 |
Radical region (***) | 130′′ × 130′′ around | 5.1 | 1.8 × 1022−1.4 × 1023 | 5.8 × 1022 | 2–38 | 30 | 12 |
α2000 = 5h35m16.51s | |||||||
δ2000 = −5°19′33.0′′ | |||||||
Dense PDR | N < 3.6 × 1022 cm−2 | 4.7 | 8.8 × 1021−3.5 × 1022 | 1.8 × 1022 | 37–51 | 44 | 13 |
high C65α emission (****) |
Notes. (†) To be used as an identifier in later plots. (*)The area around Orion KL and Orion South is saturated, thus the given maximum column density, maximum temperature, and median values are actually lower limits. (**)Mask based on an integrated [−20, 15] km s −1 intensity image of the H31α emission at 21 0501.788 MHz, where pixels with an integrated intensity over ≈ 3.1 K km s−1 were selected. (***) Coordinates based on Greaves & White (1992). (****)Mask based on an integrated intensity image of the C65α emission at 23 415.9609 MHz from Wyrowski et al. (1997), where pixels with an integrated intensity over 4 K km s −1 were selected.
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