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Table 4.

Molecular abundance with respect to 13CO: 105 × (Xmol/X13CO).

Mol. TMC-1 LkCa 15 GG Tau Mol. TMC-1 LkCa 15 GG Tau
C18O 1.1 × 104(1) 2.8 × 104(7) 2.2 × 104 C34S 10 ± 1
CN 2250 (1) 3100 (8) 660 ± 30 CS 1500 (3) 520 (8) 230 ± 10
13CN 25 ± 10 13CS 11 (4) 2.8 (10) 2.2 ± 0.6

CCH 5960 (2) 1200 (8) 600 ± 30 CCS 240 (3) 13 ± 2
N2H+ 7680 (1) 19.1 (9) 10.5 ± 0.5 OCS 1500 (1) 0.4 ± 0.2

HCN 1500 (2) 300 (8) 57 ± 3 DCN 22 (6) 7.5 (9) 1.6 ± 1.0
HNC 1500 (2) 29 ± 2 DNC 124 (6) 3.5 (9) 2.3 ± 1.1

HCO+ 596 (2) 350 (8) 125 ± 5 DCO+ 30 (5) 4.5 (11) 3.5 ± 0.2 (13)
H13CO+ 8.3 (1) 5.0 (12) 3.4 ± 0.2

H2CO 1500 (2) 13.6 (9) 33 ± 2 (*) HC3N 473 (2) 7.3 (12) 4.6 ± 0.9

Notes. (*)For para-H2CO only in GG Tau. Since estimating the uncertainties from all of these different studies was very difficult, we do not quote them for TMC1 and LkCa15.

References. (1)Dutrey et al. (1997), (2)Omont (2007), (3)Cernicharo et al. (2021), (4)Liszt & Ziurys (2012), (5)Butner et al. (1995), (6)Turner (2001), (7)Qi et al. (2003), (8)Guilloteau et al. (2016), (9)Loomis et al. (2020), (10)Le Gal et al. (2019), (11)Huang et al. (2017), (12)Chapillon et al. (2012), (13)Phuong et al. (2018).

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