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Table 10

Average and median molecular abundances in Cha I and III.

Molecule Trans.a Cha I Cha III Ratioe
Abundanceb Dispersionc N cores d Abundanceb Dispersionc N cores d
C18Of 2–1 Average 4.2 × 10-7 1.3 × 10-6 60 1.4 × 10-7 4.9 × 10-8 29 1.6
Median 2.2 × 10-7 1.3 × 10-7
C17O 2–1 Average 5.3 × 10-8 2.7 × 10-8 32 2.7 × 10-8 3.4 × 10-9 2 1.8
Median 4.9 × 10-8 2.7 × 10-8
CH3OH 20–10 A+ Average 1.3 × 10-9 7.4 × 10-10 41 9.4 × 10-10 2.9× 10-10 15 1.2
Median 1.1 × 10-9 9.6 × 10-10
CH3OH 21–11 E Average 1.2 × 10-9 6.4 × 10-10 32 1.1 × 10-9 2.8 × 10-10 10 1.1
Median 1.2 × 10-9 1.1 × 10-9
C34S 2–1 Average 3.0 × 10-10 2.0 × 10-10 23 1.8 × 10-10 3.4 × 10-11 2 1.4
Median 2.5 × 10-10 1.8 × 10-10
HC3N 10–9 Average 9.0 × 10-10 1.0 × 10-9 18 4.8 × 10-10 4.7 × 10-10 3 2.3
Median 4.7 × 10-10 1.8 × 10-10
N2H+ 1–0 Average 2.6 × 10-10 1.1 × 10-10 19 8.4 × 10-11 4.1 × 10-11 2 3.1
Median 2.6 × 10-10 8.4 × 10-10

Notes.

(a)

Transition used to calculate molecular abundances.

(b)

Average or median abundance relative to H2.

(c)

Standard deviation of abundance values shown in Fig. 10.

(d)

Number of cores used when calculating the mean and median abundances.

(e)

Ratio of median molecular abundance in Cha I to the median abundance in Cha III.

(f)

C18O 2–1 is slightly optically thick for some cores in Cha I and its abundance should therefore be considered with caution.

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