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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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