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Table 2

Parameters of the spectra extracted from the selected positions.

Position Offseta Transition vLSR Δv TMB b τ0 Tex N
(″,   ″) [km s-1] [km s-1] [K] [K km s-1] [K] [1015 cm-2]
Main velocity component
SMM 3 (0   ,0) 13CO(2−1) 8.11 ± 0.09 0.95 ± 0.36 2.73 ± 0.45 2.61 ± 0.67 [7.17, 9.21] – – –
C18O(2−1) 8.57 ± 0.05 0.63 ± 0.11 2.12 ± 0.25 1.39 ± 0.25 [8.00, 9.14] 0.2 ± 0.1c 11.0 ± 1.0c 0.85 ± 0.2d
Lower-velocity component
C18O peak (+85.5  , +14.0) 13CO(2−1) 1.52 ± 0.06 0.81 ± 0.12 5.17 ± 0.61 7.05 ± 0.86 [0.21, 2.38] e – 18.2 ± 6.8
C18O(2−1) 1.38 ± 0.06 0.97 ± 0.15 2.75 ± 0.61 2.89 ± 0.47 [0.07, 2.52] e 9.5 ± 1.8f 2.8 ± 1.0

Notes. 

(a)

Offset from the map centre in arcsec.

(b)

Integrated intensity is derived by integrating over the velocity range indicated in square brackets.

(c)

This optical thickness is estimated from that derived for C17O(2 − 1) in Paper III, and the reported Tex value is that of C17O(2 − 1).

(d)

Derived from the integrated intensity under the assumption of optically thin emission.

(e)

Derived from the line intensity ratio, as described in Sect. 3.4.

(f)

Derived using the TMB and τ0 values of the C18O line.

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