Table 5
Physical parameters of the NH3 condensations.
| Region | Sizea | Trotb | N(H2)c | M d | Mvire | n(H2)f | |
|
|
|||||||
| (arcmin) | (pc) | (K) | (1022 cm-2) | (M⊙) | (M⊙) | (103 cm-3) | |
|
|
|||||||
M120.1+3.0-N |
3.9 × 2.7 | 0.96 × 0.67 | 11.2 | 1.7 − 6.1 | 142 − 500 | 68 | 3.4 |
| M120.1+3.0-N(0,0) | 3.0 × 2.0 | 0.75 × 0.50 | ≤ 15 | ≥ 0.9 | ≥ 45 | 89 | ~2.6 |
| M120.1+3.0-S | 3.7 × 2.4 | 0.91 × 0.59 | ~13.5 | 0.7 − 2.7 | 51 − 181 | 92 | ~2.8 |
| L1287 | 3.8 × 1.9 | 0.93 × 0.48 | 17.4 | 4.6 − 7.6 | 259 − 429 | 220 | 11.3 |
| L1293 | 2.7 × 2.0 | 1.26 × 0.94 | ≤ 13 | ≥ 1.1 | ≥ 168 | 71 | ~7.7 |
| NGC 281 A-W | 1.9 × 1.6 | 1.88 × 1.62 | ~20 | 1.3 − 6.2 | 505 − 2413 | 871 | ~1.3 |
| HH31 | 2.8 × 2.0 | 0.11 × 0.08 | 9.7 | 3.7 − 7.6 | 4 − 9 | 2 | 12.4 |
| HH265 | 4.2 × 2.3 | 0.20 × 0.11 | ≤ 9 | ≥ 3.3 | ≥ 9 | 2 | ~11.3 |
| L1551 NE | 1.4 × 1.4 | 0.07 × 0.07 | ~25 | 1.0 − 5.1 | 0.6 − 3 | 1.6 | ~1.1 |
| L1634 | 2.6 × 2.1 | 0.34 × 0.28 | ~12 | 1.6 − 2.9 | 19 − 35 | 21 | ~13.1 |
| IRAS 05358 | 3.1 × 1.9 | 1.60 × 0.98 | 20.6 | 2.9 − 5.6 | 575 − 1121 | 707 | 5.9 |
| L1641-S3 (V ~4.9 km s-1) | 3.8 × 2.2 | 0.53 × 0.31 | 12.6 | 2.4 − 4.6 | 49 − 96 | 20 | 10.1 |
| L1641-S3 (V ~3.8 km s-1) | 5.8 × 2.8 | 0.81 × 0.39 | 13.5 | 1.7 − 3.9 | 68 − 157 | 5 | 6.2 |
| CB 34 | 2.0 × 1.7 | 0.89 × 0.76 | ≤ 12 | ≥ 1.3 | ≥ 111 | 162 | ~7.8 |
| HH 270/110(0,0) | 1.4 × 1.6 | 0.19 × 0.21 | ~13.6 | 0.7−2.6 | 3.5−13.3 | 9 | ~2.5 |
HH270/110 |
2.8 × 1.7 | 0.37 × 0.23 | ~13.6 | 0.8−1.4 | 8−15 | 22 | ~10.0 |
| IRAS 05490 | 2.6 × 1.7 | 1.59 × 1.05 | ~15.5 | 0.5−0.8 | 104−168 | 304 | ~14.3 |
| HH 111 | 1.6 × 1.8 | 0.22 × 0.23 | ~13 | 0.5−1.2 | 3−8 | 14 | ~5.6 |
| CB 54 | 1.7 × 1.6 | 0.74 × 0.68 | ≤ 15 | ≥ 1.0 | ≥ 62 | 96 | ~3.3 |
| L379 | 2.0 × 2.0 | 1.16 × 1.16 | 17.8 | 11.4−21.2 | 1948−3 628 | 982 | 7.6 |
| L588 | 4.1 × 1.9 | 0.37 × 0.17 | ~8 | 4.1−11.8 | 32−94 | 9 | ~7.5 |
| L673(SE)g | 2.2 × 2.0 | 0.19 × 0.17 | ≤ 12 | ≥ 2.8 | ≥ 12 | 3 | ~10.9 |
IRAS 20050 |
3.1 × 2.0 | 0.63 × 0.41 | 16.8 | 3.6−9.7 | 117−315 | 46 | 3.6 |
IRAS 20050 |
3.0 × 2.0 | 0.61 × 0.41 | 16.8 | 1.8−3.3 | 56−103 | 49 | 8.2 |
| V1057 Cyg | 1.4 × 1.4 | 0.29 × 0.29 | ~10 | 0.2−6.5 | 2−67 | 10 | 0.3−0.7 |
| CB 232 | 2.6 × 2.5 | 0.45 × 0.43 | ≤ 11 | ≥ 0.9 | ≥ 23 | 21 | ~2.2 |
| IC 1396E | 3.2 × 1.9 | 0.70 × 0.42 | 19.1 | 1.4 − 3.9 | 54 − 145 | 191 | 3.2 |
| L1165 | 3.5 × 2.3 | 0.76 × 0.49 | ~9 | 0.9−7.3 | 41−347 | 23 | ~1.3 |
| IRAS 22134 | 3.1 × 2.3 | 2.34 × 1.74 | ~15.8 | 0.6 − 1.5 | 310 − 787 | 283 | ~4.3 |
| L1221 | 2.1 × 2.0 | 0.12 × 0.11 | 12.5 | 3.9−7.6 | 7−13 | 6 | 10.5 |
| NGC 7538 | 2.5 × 2.4 | 1.96 × 1.92 | 28.3 | 5.3−7.5 | 2514−3571 | 2599 | 12.2 |
Notes.
Major and minor axes of the half-power contour of the NH3 emission. For sources L1551 NE and V1057 Cyg the size of the beam has been adopted.
Rotational temperature, derived from the ratio of column densities in the (1, 1) and (2, 2) levels (given in Tables 1 and 2, respectively), for the sources where the (2, 2) line was detected. For the sources undetected in the (2, 2) line, an upper limit was obtained assuming optically thin emission. For sources not observed in the (2, 2) line, we assumed that Tex(CO) = Trot(22 − 11) = Tk, where the CO data are from Yang et al. (1990) (M120.1+3.0-S), Henning et al. 1994 (NGC 281 A-W), Moriarty-Schieven et al. (1995) (L1551 NE), Reipurth & Oldberg (1991) (HH 270/110 and HH 111), Snell et al. (1990) (IRAS 05490), Parker et al. (1991) (L588 and L1165), Levreault (1988) (V1057 Cyg) and Dobashi et al. (1994) (IRAS 22134). For L1634, Trot = 12 K has been adopted.
Beam-averaged H2 column density, obtained from the NH3 column density adopting an NH3 abundance of [NH3/H2] = 10-8 (see Anglada et al. 1995, for a discussion on NH3 abundances). The NH3 column density is obtained assuming that only the rotational metastable levels of the NH3 are significantly populated at their LTE ratios corresponding to Tk = TR(22 − 11).
Mass of the condensation, derived from the beam-averaged H2 column density and the observed area.
Virial mass obtained from [Mvir/M⊙] = 210[R/pc][ΔV/km s-1]2, where R is the radius of the clump, taken as half the geometrical mean of the major and minor axes, and ΔV is the intrinsic line width given in Table 2.
Volume density, derived from the two-level model (Ho & Townes 1983).
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