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Table 4

Results from the LVG modelling of IRAS 18460-0151 and IRAS 18596+0315.

MASS-RELATED PARAMETERS
Source T k N(CO) Mass n(H2) V exp Ṁ 12C/13C
K 1017 cm-2 M ⊙ 103 cm-3 km s-1 M⊙ yr-1
IRAS 18460-0151 10 1.57(0.44) 0.20 7.85(2.4) 20.1 2.6 × 10-4 30
IRAS 18460-0151 20–50 1.50(0.32) 0.19 7.50(2.1) 20.1 2.5 × 10-4 23
IRAS 18596+0315a 10 2.70(0.83) 0.35 13.5(4.1) 17.8 3.9 × 10-4 9
IRAS 18596+0315a 20–50 1.91(0.26) 0.25 9.55(2.3) 17.8 2.8 × 10-4 7
IRAS 18596+0315b 30–50 18.0(4.8) 2.32 90.0(23) 17.8 2.6 × 10-3 13
OPACITIES
Source Tk (K) CO 1–0 CO 2–1 13CO 1–0 13CO 2–1
IRAS 18460-0151 10 0.82(0.46) 1.65(0.70) 0.04(0.02) 0.09(0.03)
IRAS 18460-0151 20 0.23(0.10) 0.90(0.60) 0.01(0.01) 0.06(0.04)
IRAS 18460-0151 30 0.09(0.04) 0.62(0.30) optically thin
IRAS 18460-0151 40 0.04(0.02) 0.45(0.25) optically thin
IRAS 18460-0151 50 0.01(0.01) 0.37(0.21) optically thin
IRAS 18596+0315a 10 1.47(0.60) 2.66(1.20) 0.20(0.09) 0.43(0.18)
IRAS 18596+0315a 20 0.04(0.02) 1.10(0.40) 0.04(0.03) 0.21(0.14)
IRAS 18596+0315a 30 0.02(0.01) 0.73(0.40) 0.02(0.01) 0.14(0.12)
IRAS 18596+0315a 40 optically thin
IRAS 18596+0315a 50 optically thin
IRAS 18596+0315b 30 0.97(0.40) 2.90(1.20) 0.10(0.03) 0.32(0.07)
IRAS 18596+0315b 40 0.63(0.35) 2.12(0.70) 0.06(0.02) 0.22(0.09)
IRAS 18596+0315b 50 0.38(0.20) 1.40(0.50) 0.04(0.01) 0.14(0.07)

Notes. CO abundance of 10-4 assumed. Distances from Table 1. One-sigma errors within parentheses.

(a)

Assumed distance is 4.6 kpc.

(b)

Assumed distance is 8.8 kpc.

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