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Home All issues Volume 692 (December 2024) A&A, 692 (2024) A261 Full HTML
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Table A.1

Calculated average and maximum abundances with their respective Tgas during the WCCC window of 20–50 K (1.81–2.01 Myr) for carbon-chains and other species’, relative to H2.

Observations Model
L1527 M-1/6WCCC MOWCCC M1/6WCCC
Molecule n/n(H2) Ref. (a) n/n(H2, max) Tpeak, K n/n(H2, avg) n/n(H2, max) Tpeak, K n/n(H2, avg) n/n(H2, max) Tpeak, K n/n(H2, avg)
CO 3.9E-5 1 1.8E-5 34 8.8E-6(b) 1.4E-5 36 6.6E-6 1.3E-5 39 5.0E-6
NH3 1.9E-8 2 7.6E-8 27 3.8E-8 7.4E-8 30 3.7E-8 7.4E-8 31 3.8E-8
CN 2.4E-9 3 1.1E-8 36 5.7E-9 9.5E-9 40 4.7E-9 8.9E-9 42 4.7E-9
HCN 1.2E-9 3 2.0E-8 37 9.3E-9 2.5E-8 40 9.6E-9 2.4E-8 42 1.0E-8
HNC 3.2E-10 3 6.9E-9 37 3.9E-9 8.5E-9 40 4.0E-9 8.4E-9 41 4.4E-9
HCO+ 6.0E-10 3 4.5E-9 50 2.5E-9 4.5E-9 50 2.1E-9 4.2E-9 50 1.8E-9
N2H+ 2.5E-10 3 2.8E-9 27 9.5E-10 3.0E-9 30 1.0E-9 3.1E-9 32 1.2E-9
SO 1.4E-10 3 5.9E-12 25 2.1E-12 7.6E-12 27 1.7E-12 5.7E-12 28 1.7E-12
CS 3.3E-10 3 5.4E-11 30 1.9E-11 6.3E-11 27 2.1E-11 5.8E-11 28 2.1E-11
CH4 9.8E-6 4 3.5E-6 37 1.0E-6 3.9E-6 40 8.9E-7 2.8E-6 42 7.1E-7
CH3CN 9.1E-12 5 4.1E-10 37 1.6E-10 5.5E-10 40 1.6E-10 5.5E-10 42 1.8E-10
CH2CN 7.9E-11 5 4.6E-11 35 1.9E-11 3.3E-11 31 1.1E-11 2.5E-11 33 9.9E-12
CH3OH 8.2E-10 5 1.5E-10 30 3.5E-11 3.1E-11 43 2.0E-11 3.3E-11 34 1.7E-11
2.3E-9 6
C2H >1.8E-8 7 1.1E-8 35 5.9E-9 1.2E-8 19 4.8E-9 1.2E-8 20 4.4E-9
HC3N(d) 9.6E-10 6 8.4E-9 38 2.9E-9 7.6E-9 40 2.1E-9 6.2E-9 42 1.9E-9
4.4E-10 5
CH3CCH 2.1E-9 7 2.4E-9 38(c) 1.0E-9 2.2E-9 41 8.2E-10 1.9E-9 44 7.1E-10
C2S 1.8E-10 7 2.2E-11 24 5.4E-12 3.9E-11 26 8.4E-12 2.8E-11 26 7.8E-12
CH2CO 2.5E-10 5 2.7E-10 50 5.4E-11 2.3E-10 50 3.0E-11 1.1E-10 50 1.9E-11
C3H 2.0E-10 8 4.0E-9 38 1.6E-9 3.8E-9 41 1.2E-9 3.7E-9 44 1.3E-9
1.2E-10 6
c-C3H2 4.6E-10 6 9.6E-9 50 4.6E-9 8.5E-9 50 3.2E-9 7.4E-9 47 2.7E-9
1-C3H2 3.9E-11 7
C4H(d) 6.8E-9 7 2.9E-10 34 1.5E-10 2.3E-10 41 1.1E-10 2.4E-10 45 1.0E-10
3.5E-8 9
C4H− 3.9E-13 10 2.4E-12 20 4.0E-13 2.8E-12 19 2.8E-13 3.0E-12 20 3.6E-13
C4H2 5.7E-11 7 3.9E-9 38 1.7E-9 2.6E-9 41 1.1E-9 2.2E-9 45 9.1E-10
HC5N 1.9E-10 7 4.1E-10 38 1.3E-10 2.8E-10 41 8.5E-11 2.3E-10 42 7.5E-11
8.6E-11 5
CH3C4H 2.0E-10 8 4.2E-10 50 9.4E-11 1.5E-10 19 4.4E-11 1.5E-10 20 3.9E-11
C5H 3.2E-11 7 1.7E-10 38 7.0E-11 1.3E-10 41 4.8E-11 1.2E-10 44 4.3E-11
1.9E-11 5
C6H 2.2E-11 11 7.9E-11 34 3.4E-11 6.2E-11 36 2.4E-11 6.1E-11 44 2.3E-11
3.9E-11 8
C6H2 3.9E-11 11 2.1E-9 38 8.5E-10 1.5E-9 41 5.4E-10 1.3E-9 44 4.7E-10
6.6E-12 8
HC7N 5.4E-11 7 2.5E-10 38 7.0E-11 1.6E-10 41 3.8E-11 1.3E-10 44 3.3E-11
C7H 2.1E-12 8 2.2E-11 34 8.7E-12 1.9E-11 36 6.3E-12 1.8E-11 40 6.0E-12
HC9N 5.0E-12 7 1.0E-10 38 2.9E-11 6.4E-11 41 1.6E-11 5.4E-11 42 1.4E-11
κ¯$\[\bar{\kappa}\]$ 0.468 0.467 0.462
κ¯red$\[\bar{\kappa}_{\text {red}}\]$ 0.599 0.593 0.585
Fits 9 20 0 20 1 19

Notes. (a)1 – Jørgensen et al. (2002), 2 – Hirota et al. (2009), 3 – Jørgensen et al. (2004), 4 – Sakai et al. (2012), 5 – Yoshida et al. (2019), 6 – Sakai et al. (2009b), 7 – Sakai et al. (2008a), 8 – Araki et al. (2017), 9 – Sakai et al. (2010), 10 – Sakai et al. (2008b), 11 – Sakai et al. (2007). Where necessary, NH2 was taken to be 2.8 × 1022 (Jørgensen et al. 2002). (b) Calculated n/n(H2) agreeing within a factor of 10 with observed values are marked with bold font. (c)Tgas values lower by at least 3 K than those of any of the other models are marked with bold font. (d)More than an order of magnitude lower abundances have been observed in the WCCC core Chamaeleon MMS1 (Cordiner et al. 2012).

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