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Table A.3

Comparison of fractional abundances with other observations/models.

Species Fractional abundance Fractional abundance
by observations/other by our modelC
chemical models
Peak abundance Abundance after 2 × 106 year
CH2CN 2.5 × 10-09O, 4.59 × 10-11W 1.46 × 10-09 1.43 × 10-11
CH3CN 5.00 × 10-10O, 6.95 × 10-12W 5.01 × 10-09 3.74 × 10-13
HCN 1.00 × 10-08O,2.95 × 10-9W 4.93 × 10-08 9.01 × 10-10
CH3CN+ 1.02 × 10-18W 6.24 × 10-16 3.49 × 10-19
CH3CNH+ 2.55 × 10-14W 2.78 × 10-10 5.36 × 10-17
DCN 2.1 − 3.7 × 10-10T 1.38 × 10-07 2.69 × 10-10

Notes.

(O)

Observation by Ohishi et al. (1992) in TMC-1.

(W)

Chemical model by Woodall et al. (2007), by considering nH = 2 × 104 cm-3, T = 10 K, AV = 15.

(T)

Observation by Turner (2001) in TMC-1.

(C)

Our model by considering nH = 8984.52 cm-3, T = 10 K, AV = 10.

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