Table 3
Integrated intensity ratios, column densities, spatial densities, and temperatures.
| N(H2) | ||||||||||||||||
|
|
||||||||||||||||
| Sources | 321–220 | H2CO 303–202 | N(C18O) | N(para-H2CO) | C18O | CO | n(H2) | Tkin | TLTE | Tdust c | ||||||
|
|
||||||||||||||||
|
|
||||||||||||||||
| 303–202 | C18O 2–1 | ×1014 cm-2 | ×1012 cm-2 | ×1022 cm-2 | ×105 cm-3 | K | K | K | ||||||||
|
|
||||||||||||||||
| 30 Dor | 0.27±0.05 | 2.12±0.32 | 1.0 | 1.0 | 0.7 | 0.6 | 1.45 |
63.0 |
70.4 | 70–75 | ||||||
| N113a | 0.23±0.03 | 1.22±0.12 | 2.7 | 2.7 | 2.0 | 1.0 | 0.89 |
53.6 |
54.1 | 30–51 | ||||||
| N44BC | 0.20±0.03 | 1.39±0.07 | 3.0 | 3.0 | 2.1 | 1.3 | 1.13 |
47.3 |
45.9 | 35–45 | ||||||
| N159Wb | 0.13±0.02 | 1.01±0.08 | 3.7 | 3.7 | 2.7 | 1.8 | 1.00 |
35.3 |
32.0 | 30–40 | ||||||
| N159E | 0.13±0.03 | 2.39±0.21 | 1.2 | 1.2 | 0.9 | 0.8 | 2.92 |
37.2 |
46.4 | 30–40 | ||||||
| N159S | <0.085 | 0.35±0.07 | 0.9 | 0.9 | 0.6 | 1.4 | >0.43 | <26.9 | <25.1 | 20–30 | ||||||
Notes. Column 4: Obtained from Eq. (1). Column 5: Para-H2CO column densities adopting N(C18O)/N(para-H2CO) = 100 (see Sect. 3.1). Column 6: H2 column density derived from C18O with X(C18O/H2) = 4.2 × 10-8 (Frerking et al. 1982) and using the factor 3 correction explained in Sect. 3.1. Column 7: H2 column density obtained from 12CO(1–0) with a conversion factor of XCO = 4 × 1020 cm-2 (K km s-1)-1 (see Sect. 3.1). Column 9: Tkin derived with the density given in Col. (8).
N113: Para-H2CO 303–202/C18O 2–1 ratio data taken from Heikkilä et al. (1998) and Wang et al. (2009). N(C18O) derived from C18O 2–1 taken from Heikkilä et al. (1998).
N159W: Para-H2CO 303–202/C18O 2–1 ratio data taken from Heikkilä et al. (1998, 1999). N(C18O) derived from C18O 2–1 taken from Heikkilä et al. (1998). N(H2) data taken from Ott et al. (2010).
Dust temperature references: 30 Dor: Werner et al. (1978), Heikkilä et al. (1999), Gordon et al. (2014); N113: Wang et al. (2009), Gordon et al. (2014), Seale et al. (2014); N44BC: Gordon et al. (2014); N159W: Heikkilä et al. (1999), Bolatto et al. (2000), Gordon et al. (2014); N159E: Gordon et al. (2014); N159S: Gordon et al. (2014). The upper and lower limits in Cols. 2 and 8–10 correspond to 3σ values.
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.