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Home All issues Volume 706 (February 2026) A&A, 706 (2026) A272 Full HTML
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Table A.1

Line parameters of the detected molecules in B213-C2.

Species Line Frequency
(MHz)		 v
(km s−1)		 ∆v
(km s−1)		 TMB
(mK)		 ∫TMBdv
(mK km s−1)
2( 1,2)-1(1, 1)A, vt=0 37464.20 6.94 ± 0.06 0.34 ± 1.56 7.91 ± 1.16 2.86 ± 0.63
2( 1,2)-1(1, 1)E, vt=0 37686.93 5.76 ± 0.09 0.73 ± 0.17
0.54 ± 0.16		 5.80 ± 1.79 4.48 ± 1.09
CH3CHO 7.00 ± 0.09 5.17 ± 1.79 2.99 ± 0.93
2( 0, 2)- 1(0, 1)E, vt=0 38506.03 6.91 ± 0.03 0.49 ± 0.05 16.34 ± 1.76 8.44 ± 0.96
2( 0, 2)- 1(0, 1) A, vt=0 38512.08 6.84 ± 0.06 0.81 ± 0.27 10.21 ± 1.52 8.76 ± 1.70
2( 1, 1)- 1( 1, 0) E, vt=0 39362.54 7.01 ± 0.05 0.71 ± 0.14 8.25 ± 1.36 6.25 ± 0.96
2( 1, 1)- 1( 1, 0) A, vt=0 39594.29 6.92 ± 0.04 0.59 ± 0.10 10.02 ± 1.42 6.25 ± 0.88
4( 1, 4)- 3(- 0, 3) E, vt=0 36169.26 7.07 ± 0.02 0.62 ± 0.05 19.72 ± 1.29 12.93 ± 0.89
7( 2, 5)- 8( 1, 8) E, vt=0 37703.76 – – ≤ 2.68 ≤ 1.48
CH3OH 7( 0, 7)- 6( 1, 6) A, vt=0 44069.37 – – ≤ 2.96 ≤ 1.51
1( 0, 1)- 0( 0, 0) A, vt=0 48372.46 6.978 ± 0.003 0.47 ± 0.01
0.60 ± 0.04		 254.57 ± 3.89 126.77 ± 2.01
40.90 ± 2.25
5.58 ± 0.02 64.42 ± 3.89
1(- 0, 1)- 0(- 0,0) E, vt=0 48376.89 7.02 ± 0.08 0.51 ± 0.24 16.62 ± 4.63 9.06 ± 2.86
CS 1-0 48990.95 5.605 ± 0.005 0.68 ± 0.01 910.94 ± 4.99 654.76 ± 7.75
6.904 ± 0.003 0.581 ± 0.005 1371.45 ± 4.99 848.50 ± 5.81
H2CS 1(0, 1)- 0( 0, 0) 34351.43 7.08 ± 0.02 0.63 ± 0.04 41.13 ± 2.05 27.77 ± 1.40
HCNS 3-2 36908.48 – – ≤ 2.66 ≤ 1.48
4-3 49211.11 – – ≤ 7.47 ≤ 3.60
3( 1, 3)- 2( 1, 2) 34228.19 – – ≤ 2.88 ≤ 1.67
3( 2, 2)- 2( 2, 1) 34405.13 – – ≤ 1.94 ≤ 1.12
3( 2, 1)- 2( 2, 0) 34405.28 – – ≤ 1.96 ≤ 1.13
3( 0, 3)- 2( 0, 2) 34408.63 – – ≤ 2.37 ≤ 1.37
HSCN 3( 1, 2)- 2( 1, 1) 34587.50 – – ≤ 2.16 ≤ 1.24
4( 1, 4)- 3( 1, 3) 45637.36 – – ≤ 5.83 ≤ 2.92
4( 2, 3)- 3( 2, 2) 45873.29 – – ≤ 4.84 ≤ 2.42
4( 2, 2)- 3( 2, 1) 45873.66 – – ≤ 4.74 ≤ 2.37
4( 0, 4)- 3( 0, 3) 45877.81 – – ≤ 5.92 ≤ 2.96
4( 1, 3)- 3( 1, 2) 46116.44 – – ≤ 5.35 ≤ 2.67
HCS+ 1-0 42674.20 7.00 ± 0.03 0.56 ± 0.07 20.61 ± 2.18 12.33 ± 1.27
OCS 3-2 36488.81 6.91 ± 0.06 0.68 ± 0.15 9.51 ± 1.62 6.89 ± 1.20
5.62 ± 0.08 0.63 ± 0.42 7.39 ± 1.62 4.95 ± 0.19
4-3 48651.60 7.03 ± 0.07 0.62 ± 0.16 20.55 ± 4.99 13.55 ± 2.93
SO2 6( 2, 4)- 7( 1, 7) 44052.86 7.44 ± 0.10 0.70 ± 0.17 5.96 ± 1.95 4.45 ± 1.15
N= 2- 1, J= 3- 2 33751.37 6.996 ± 0.002 0.569 ± 0.005 246.12 ± 1.70 149.14 ± 1.13
CCS N= 3- 2, J= 3- 2 38866.42 6.99 ± 0.01 0.50 ± 0.03 39.05 ± 1.48 20.84 ± 0.87
N= 4- 3, J= 3- 2 43981.02 7.00 ± 0.01 0.50 ± 0.03 49.22 ± 2.35 26.28 ± 1.29
N= 3- 2, J= 4- 3 45379.05 7.133 ± 0.002 0.439 ± 0.006 367.74 ± 3.02 171.80 ± 1.64
6-5 34684.37 7.024 ± 0.006 0.53 ± 0.02 60.47 ± 1.27 33.89 ± 0.80
C3S 7-6 40465.02 7.036 ± 0.005 0.51 ± 0.02 63.00 ± 1.31 34.35 ± 0.77
8-7 46245.62 7.041 ± 0.019 0.44 ± 0.04 71.48 ± 5.42 33.34 ± 2.77
CH3CCH 2(0)-1(0) 34183.41 6.99 ± 0.03 0.66 ± 0.08 18.26 ± 1.75 12.73 ± 1.31
CH3CN 2( 1)- 1( 1) 36794.77 – – ≤ 4.21 ≤ 2.35
2(0)-1(0) 36795.47 6.27 ± 0.07 0.88 ± 0.19 8.81 ± 1.77 8.24 ± 1.44
J = 12- 11 31951.77 6.95 ± 0.01 0.45 ± 0.01 141.10 ± 3.55 67.61 ± 2.35
J = 13 - 12 34614.39 7.019 ± 0.003 0.515 ± 0.007 123.55 ± 1.23 67.76 ± 0.76
J = 14 - 13 37276.99 7.056 ± 0.004 0.52 ± 0.01 115.05 ± 1.48 63.37 ± 0.89
HC5N J = 15 - 14 39939.59 7.126 ± 0.004 0.547 ± 0.009 102.26 ± 1.53 59.54 ± 0.89
J = 16- 15 42602.15 7.038 ± 0.004 0.43 ± 0.02 101.45 ± 2.07 46.12 ± 1.11
J = 17 - 16 45264.72 7.011 ± 0.007 0.40 ± 0.02 91.88 ± 2.70 39.56 ± 1.30
J = 18 - 17 47927.27 7.020 ± 0.009 0.35 ± 0.03 90.77 ± 4.19 33.54 ± 1.93
J = 28 - 27 31583.70 7.31 ± 0.14 0.83 ± 0.29 115.56 ± 4.20 10.26 ± 3.29
J = 29 - 28 32711.68 7.15 ± 0.07 0.50 ± 0.28 7.83 ± 1.26 4.17 ± 0.95
J = 30 - 29 33839.63 6.85 ± 0.04 0.64 ± 0.01 8.79 ± 1.08 6.00 ± 0.77
HC7N J = 31 - 30 34967.59 6.99 ± 0.03 0.33 ± 1.37 8.88 ± 1.34 3.09 ± 0.53
J = 32 - 31 36095.53 6.98 ± 0.07 0.68 ± 0.18 5.83 ± 1.30 4.20 ± 0.88
J = 33 - 32 37223.49 – – ≤ 2.36 ≤ 1.31
J = 34 - 33 38351.45 – – ≤ 2.46 ≤ 1.35
J = 35 - 34 39479.41 7.16 ± 0.11 0.74 ± 0.21 4.12 ± 1.42 3.25 ± 0.92
J = 36 - 35 40607.33 – – ≤ 3.11 ≤ 0.28
J = 37 - 36 41735.26 – – ≤ 2.73 ≤ 1.43
J = 38 - 37 42863.20 7.13 ± 0.08 0.57 ± 0.17 6.24 ± 1.73 3.78 ± 0.98
J = 39 - 38 43991.13 – – ≤ 4.27 ≤ 2.18
J = 40 - 39 45119.06 – – ≤ 4.08 ≤ 2.05
J = 41 - 40 46246.98 – – ≤ 5.25 ≤ 2.61
J = 42 - 41 47374.90 – – ≤ 5.87 ≤ 2.89
J = 43 - 42 48502.81 – – ≤ 6.82 ≤ 3.31
J = 44 - 43 49630.72 – – ≤ 7.76 ≤ 3.73
PO+ 1-0 47024.25 – – ≤ 5.07 ≤ 2.50
N= 1- 0, J=1∕2-1∕2, F= 0- 1 47011.71 – – ≤ 5.21 ≤ 2.57
N= 1- 0, J=1∕2-1∕2, F= 1- 0 47124.24 – – ≤ 6.32 ≤ 3.11
CP N= 1- 0, J=1∕2-1∕2, F= 1- 1 47256.93 – – ≤ 5.70 ≤ 2.80
N= 1- 0, J=3∕2-1∕2, F= 1- 0 47979.86 – – ≤ 7.74 ≤ 3.78
N= 1- 0, J=3∕2-1∕2, F= 2- 1 47982.88 – – ≤ 6.23 ≤ 3.04
N= 1- 0, J=3∕2-1∕2, F= 1- 1 48112.5 – – ≤ 6.15 ≤ 3.00
HCP 1-0 39951.90 – – ≤ 2.35 ≤ 1.26
J=5/2-3/2, Ω=1∕2, F= 3- 2, l=e 31765.86 – – ≤ 6.45 ≤ 3.87
CCP J=5/2-3/2, Ω=1∕2, F= 3- 2, l=f 31832.45 – – ≤ 8.05 ≤ 4.82
J=7∕2-5∕2, Ω=1∕2, F= 4- 3, l=f 44558.92 – – ≤ 3.48 ≤ 1.76
4( 4, 0)- 4( 3, 1) 35360.93 – – ≤ 2.73 ≤ 1.55
5(4, 1)-5(3,2) 42139.19 – – ≤ 3.04 ≤ 1.58
4( 3, 1)- 4( 2, 2) 42231.25 – – ≤ 3.21 ≤ 1.67
c-C3H2 3( 2, 1)- 3( 1, 2) 44104.78 6.98 ± 0.01 0.44 ± 0.02 53.56 ± 2.50 25.09 ± 1.23
6(5, 1)- 6(4, 2) 44624.90 – – ≤ 3.69 ≤ 1.87
5( 5, 0)- 5( 4, 1) 46645.05 – – ≤ 5.30 ≤ 2.63
2( 1, 1)- 2( 0, 2) 46755.61 6.980 ± 0.004 0.41 ± 0.01 316.88 ± 3.45 136.67 ± 3.11
2( 1, 1)- 2( 1, 2), J=3∕2-3∕2, F= 2- 2 44272.60 – – ≤ 4.06 ≤ 2.06
c-C3H 2( 1, 1)- 2( 1, 2), J=3∕2-3∕2, F= 1- 1
2( 1, 1)- 2( 1, 2), J=5∕2-5∕2, F= 3- 3		 44281.61
44610.39		 -
–		 -
–		 ≤ 3.73
≤ 3.69		 ≤ 1.89
≤ 1.87
2( 1, 1)- 2( 1, 2), J=5∕2-5∕2, F= 2- 2 44610.87 – – ≤ 3.92 ≤ 1.99
J=3∕2-1∕2, Ω=1∕2, F= 1- 1, l=f 32617.02 – – ≤ 6.99 ≤ 4.14
J=3∕2-1∕2, Ω=1∕2, F= 2- 1, l=f 32627.30 7.073 ± 0.006 0.56 ± 0.02 63.93 ± 1.39 38.37 ± 0.98
l-C3H J=3∕2-1∕2, Ω=1∕2, F= 1- 0, l=f 32634.39 7.07 ± 0.01 0.54 ± 0.06 27.49 ± 1.34 15.88 ± 0.97
J=3∕2-1∕2, Ω=1∕2, F= 2- 1, l=e 32660.65 6.974 ± 0.007 0.58 ± 0.01 61.76 ± 1.33 38.13 ± 0.88
J=3∕2-1∕2, Ω=1∕2, F= 1- 0, l=e 32663.36 6.97 ± 0.02 0.51 ± 0.05 25.61 ± 1.67 13.79 ± 1.07
J=3∕2-1∕2, Ω=1∕2, F= 1- 1, l=e 32667.67 6.91 ± 0.03 0.67 ± 0.09 15.21 ± 1.45 10.87 ± 1.09
2( 1,2)-1(1,1) 42598.19 6.73 ± 0.10 0.72 ± 0.20 6.18 ± 1.92 4.76 ± 1.24
HOCO+ 2( 0, 2)- 1(0, 1) 42766.20 7.04 ± 0.03 0.56 ± 0.07 18.02 ± 1.78 10.79 ± 1.06
2( 1,1)-1(1,0) 42926.80 – – ≤ 3.02 ≤ 1.56
N= 1- 0, J= 1- 1 32623.45 – – ≤ 3.77 ≤ 2.23
N= 2- 1, J= 1- 1 32738.61 – – ≤ 2.73 ≤ 1.62
CCO N= 2- 1, J= 1- 2 43103.88 – – ≤ 3.22 ≤ 1.66
N= 2- 1, J= 3- 2 45826.71 – – ≤ 4.37 ≤ 2.18
N= 2- 1, J= 2- 1 46182.19 – – ≤ 4.19 ≤ 2.08
C3O 4-3 38486.86 6.77 ± 0.02 0.50 ± 0.04 11.63 ± 1.36 6.20 ± 0.46
5-4 48108.50 7.19 ± 0.02 0.42 ± 0.05 37.66 ± 3.75 16.73 ± 1.76
4( 1, 4)- 3( 1, 3) 37018.92 – – ≤ 2.67 ≤ 1.48
4( 0, 4)- 3( 0, 3) 37904.85 – – ≤ 2.91 ≤ 1.60
4( 2, 3)- 3( 2, 2) 37939.62 – – ≤ 2.63 ≤ 1.44
4( 3, 2)- 3( 3, 1) 37952.63 – – ≤ 2.56 ≤ 1.40
4(3, 1)-3(3,0) 37952.73 – – ≤ 2.47 ≤ 1.36
4( 2, 2)- 3( 2, 1) 37974.37 – – ≤ 2.53 ≤ 1.39
4( 1, 3)- 3( 1, 2) 38847.74 6.61 ± 0.10 0.54 ± 0.17 3.81 ± 1.30 2.19 ± 0.72
5( 1,5)-4( 1,4) 46266.93 – – ≤ 4.88 ≤ 2.43
CH2CHCN 5( 0, 5)- 4( 0, 4) 47354.65 – – ≤ 6.14 ≤ 3.02
5( 2, 4)- 4( 2, 3) 47419.79 – – ≤ 5.72 ≤ 2.81
4( 1,3)-4( 0,4) 47436.36 – – ≤ 5.72 ≤ 2.81
5( 3, 3)- 4( 3, 2) 47443.53 – – ≤ 5.63 ≤ 2.76
5(3,2)- 4(3, 1) 47443.88 – – ≤ 5.32 ≤ 2.61
5(4, 2)- 4(4, 1) 47445.43 – – ≤ 5.15 ≤ 2.53
5(4, 1)- 4(4, 0) 47445.43 – – ≤ 5.18 ≤ 2.54
5( 2, 3)- 4( 2, 2) 47489.23 – – ≤ 5.23 ≤ 2.57
9( 0, 9)- 8( 1, 8) 47499.58 – – ≤ 4.92 ≤ 2.41
5( 1,4)-4( 1,3) 48552.56 – – ≤ 6.94 ≤ 3.37
5( 1, 4)- 5( 0, 5) 48634.28 – – ≤ 7.45 ≤ 3.61
3( 1, 3)- 2( 1, 2) 33438.37 – – ≤ 2.82 ≤ 1.65
H2CCS 3( 0, 3)- 2( 0, 2 33611.70 – – ≤ 2.57 ≤ 1.50
3( 1,2)- 2( 1, 1) 33783.23 – – ≤ 5.71 ≤ 3.32
4( 1, 4)- 3( 1, 3) 44584.34 – – ≤ 3.49 ≤ 1.77
4( 2, 3)- 3( 2, 2) 44810.21 – – ≤ 3.98 ≤ 2.01
4( 2, 2)- 3( 2, 1) 44810.56 – – ≤ 3.85 ≤ 1.94
4( 0, 4)- 3( 0, 3) 44815.32 – – ≤ 4.03 ≤ 2.04
4( 1, 3)- 3( 1, 2) 45044.18 – – ≤ 4.29 ≤ 2.16
5( 1,4)-5( 1, 5),J=92−92$\frac{9}{2}$-$\frac{9}{2}$,F=4-4
5( 1,4)-5( 1, 5), J=92−92$\frac{9}{2}$-$\frac{9}{2}$,F=5-5		 42222.60 – – ≤ 3.26 ≤ 1.69
HCO 42229.19 – – ≤ 3.12 ≤ 1.62
5( 1,4)-5( 1, 5), J=112−112$\frac{11}{2}$-$\frac{11}{2}$,F= 5-5
5( 1,4)-5( 1, 5), J=112−112$\frac{11}{2}$-$\frac{11}{2}$,F= 6-6		 42825.36 – – ≤ 2.96 ≤ 1.53
42840.62 – – ≤ 3.80 ≤ 1.96
4( 1,3)-4( 0, 4) 32742.82 – – ≤ 2.38 ≤ 1.40
5( 1, 4)- 5( 0, 5) 36417.24 – – ≤ 2.22 ≤ 1.24
t-CH3CH2OH 6( 1, 5)- 6( 0, 6) 41124.95 – – ≤ 2.52 ≤ 1.33
4( 0, 4)- 3( 1, 3) 46832.80 – – ≤ 4.90 ≤ 2.42
7( 1, 6)- 7( 0, 7) 46980.15 – – ≤ 5.96 ≤ 2.94
10( 1,10)- 9( 2, 7) 48079.03 – – ≤ 4.92 ≤ 2.45
5( 1, 4)- 5( 0, 5) EE 39047.30 – – ≤ 2.89 ≤ 1.56
CH3OCH3 6( 1, 5)- 6( 0, 6) EE 43447.57 – – ≤ 3.55 ≤ 1.82
7( 1, 6)- 7( 0, 7) EE 48901.45 – – ≤ 7.90 ≤ 3.82
7( 1, 6)- 7( 0, 7) AA 48902.63 – – ≤ 7.68 ≤ 3.71
2( 1,2)-1(1, 1) 43303.71 – – ≤ 3.59 ≤ 1.85
t-HCOOH 2( 0, 2)- 1(0, 1) 44911.74 – – ≤ 3.87 ≤ 1.95
2( 1, 1)-1(1,0) 46581.23 – – ≤ 6.05 ≤ 3.00
7( 1, 6)- 7( 1, 7) 39295.95 – – ≤ 2.50 ≤ 1.35
5( 0, 5)- 4( 1, 4) 40778.14 – – ≤ 2.83 ≤ 1.50
c-HCOOH 2( 1,2)-1(1, 1) 42541.36 – – ≤ 3.04 ≤ 1.58
2( 0, 2)- 1(0, 1) 43926.44 – – ≤ 4.12 ≤ 2.10
2( 1, 1)-1(1,0) 45351.35 – – ≤ 4.70 ≤ 2.36
2(1,2)-1(1,1) 41198.34 6.999 ± 0.007 0.41 ± 0.02 45.91 ± 1.60 19.88 ± 0.07
l-C3H2 2(0, 2)-1(0,1) 41584.68 7.04 ± 0.01 0.49 ± 0.03 39.20 ± 1.85 20.52 ± 1.72
2(1, 1)-1(1,0) 41967.67 7.027 ± 0.008 0.41 ± 0.03 47.78 ± 1.70 20.63 ± 0.08
HONC 2(0, 2)-1(0,1) 43813.37 – – ≤ 3.02 ≤ 1.54
13CS 1-0 46247.56 6.95 ± 0.06 0.60 ± 0.13 39.98 ± 6.96 25.32 ± 4.87
C34S 1-0 48206.94 5.69 ± 0.01 0.47 ± 0.03 75.82 ± 4.25 38.29 ± 2.14
6.939 ± 0.005 0.53 ± 0.01 212.88 ± 4.25 120.00 ± 4.87
C33S 1-0 48585.89 – – ≤ 8.60 ≤ 4.17
N= 2- 1, J= 3- 2 33111.84 7.06 ± 0.05 0.48 ± 0.09 9.57 ± 1.30 4.88 ± 0.79
CC34S N= 3- 2, J= 3- 2 38015.23 – – ≤ 2.49 ≤ 1.37
N= 4- 3, J= 3- 2 42918.18 – – ≤ 4.20 ≤ 2.17
N= 3- 2, J= 4- 3 44497.60 – – ≤ 4.8 ≤ 2.43
J=6-5 33844.24 – – ≤ 2.71 ≤ 1.58
CCC34S J=7-6 39484.87 – – ≤ 2.73 ≤ 1.57
J=8-7 45125.46 – – ≤ 5.27 ≤ 2.65
HC34S+ 1-0 41983.06 – – ≤ 3.00 ≤ 1.57
OC34S 3-2 35596.87 – – ≤ 2.38 ≤ 1.35
4-3 47462.35 – – ≤ 6.08 ≤ 2.98
H2C34S 1(0, 1)- 0( 0, 0) 33765.80 – – ≤ 2.51 ≤ 1.46

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