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Home All issues Volume 625 (May 2019) A&A, 625 (2019) A147 Full HTML
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Table 1

Beam-averaged column densities and rotational temperatures.

Species N(cm−2) (a) Trot (K) Eup (K) Nlines (b)
O-bearing molecules
CO > 6.2 × 1016 10 (c) 5.5–5.5 1
13CO > 1.4 × 1016 10 (c) 5.3–5.3 1
C18O > 4.8 × 1015 10 (c) 5.3–5.3 1
C17O 1.7 × 1015 10 (c) 5.4–5.4 2
13C18O 1.3 × 1014 10 (c) 5.0–5.0 1
13C17O 4.1 × 1013 10 (c) 5.1–5.1 2
C2O 5.4 × 1011 10 (c) 11.0–11.5 2
C3O 7.6(49) × 1011 10.2(21) 20.8–36.0 4
HCO 2.8 × 1012 10 (c) 4.2–4.2 3 / 4
HCCO 3.1 × 1011 10 (c) 10.4–10.4 4
CH3O 8.0 × 1011 10 (c) 4.0–4.0 3 / 4
D2CO 1.4 × 1012 10 (c) 5.3–5.3 1
CH3OH (d) 4.6–32.5 9
CH2DOH 5.5(18) × 1012 4.3(3) 6.4–25.8 7 / 8
CH3OD 4.0 × 1012 4.3 (c) 6.5–6.5 1
CHD2OH 8.2 × 1011 4.3 (c) 6.0–6.0 1
13CH3OH 4.3 × 1012 4.3 (c) 4.5–6.8 2
H2CCO 4.1 × 1012 10 (c) 8.6–14.5 6
HDCCO 3.7 × 1011 10 (c) 13.5–19.0 2
CH3CHO 3.8(10) × 1012 5.8(5) 4.9–23.0 18
HCCCHO 8.3(17) × 1011 7.6(5) 4.4–27.2 9 / 10
c-C3H2O 2.3(13) × 1011 7.9(13) 14.0–28.0 11
t-HCOOH 1.2(8) × 1012 7.0(17) 10.8–18.8 5
c-HCOOH 7.2 × 1010 7.0 (c) 4.6–14.5 3
C2H5OH 2.0 × 1012 4.3 (c) 9.3–9.3 1
HCOOCH3 2.3 × 1012 10 (c) 17.4–24.9 16 / 17
CH3OCH3 5.3 × 1012 10 (c) 6.7–19.0 6 / 9
HCO+ > 6.7 × 1012 10 (c) 4.3–4.3 1
H13CO+ > 2.5 × 1012 10 (c) 4.2–4.2 1
HC18O+ 4.0 × 1011 10 (c) 4.1–4.1 1
HC17O+ 1.3 × 1011 10 (c) 4.2–4.2 3
HCO2+ 3.1 × 1011 10 (c) 10.3–15.4 2
DCO2+ 4.1 × 1010 10 (c) 9.6–9.6 1 / 2
Hydrocarbons
C2H > 5.1 × 1014 10 (c) 4.2–4.2 2 / 6
13CCH 3.1 × 1012 10 (c) 4.0–4.0 7 / 8
C13CH 7.2 × 1012 10 (c) 4.1–4.1 6 / 7
c-C3H 7.9 × 1012 10 (c) 4.4–4.4 9
c-C3D 3.5 × 1011 10 (c) 5.4–5.4 1
l-C3H 6.4(18) × 1011 10.5(15) 12.5–28.0 6
C4H 1.2(5) × 1014 7.9(8) 20.5–35.6 8
C4D 2.3 × 1012 7.9 (c) 23.3–28.0 4
C5H 7.2 × 1011 7.9 (c) 37.0–37.0 2
c-C3H2 2.1 × 1014 4.1 (c) 26.7–28.8 2 / 6
c-HCC13CH 4.1(15) × 1012 4.1(3) 6.3–15.9 9
c-HC13CCH 4.7 × 1011 4.1 (c) 3.9–9.4 3
c-C3HD 2.2(7) × 1013 4.1(2) 7.6–26.6 7 / 10
N-bearing molecules
c-C3D2 2.1 × 1012 4.1 (c) 6.1–20.2 5
c-H13CCCD 2.0 × 1011 4.1 (c) 10.7–10.7 2
c-HCC13CD 2.5 × 1011 4.1 (c) 10.6–10.6 1 / 2
c-HC13CCD (e) 2.5 × 1011 4.1 (c) 10.6–10.6 1
l-C3H2 1.1(7) × 1012 5.4(12) 8.9–15.0 6
l-C3HD 8.1 × 1010 5.4 (c) 14.0–22.9 2
H2C4 3.5(14) × 1011 9.6(13) 18.8–33.4 12
CH3CCH 9.3 × 1013 10.2 (c) 11.5–82.3 8
CH2DCCH 1.8(3) × 1013 10.2(7) 11.6–43.6 15
13CH2DCCH 7.9 × 1011 10.2 (c) 15.9–15.9 1
CH3CCD 5.3 × 1012 10.2 (c) 15.0–20.9 4
13CH3CCH 1.5 × 1012 10.2 (c) 11.2–16.8 4
CH313CCH 1.7 × 1012 10.2 (c) 11.5–17.2 4
CH3C13CH 1.6 × 1012 10.2 (c) 11.1–16.7 4
CH3C4H 7.6 × 1012 10 (c) 40.8–45.1 4
NH2D 7.1 × 1013 10 (c) 20.1–21.3 8 / 10
CN > 6.6 × 1013 10 (c) 5.4–5.4 2 / 9
13CN 6.4 × 1012 10 (c) 5.2–5.2 10 / 21
C15N 7.6 × 1011 10 (c) 5.3–5.3 6
HCN > 2.4 × 1013 10 (c) 4.3–4.3 1 / 3
H13CN 3.9 × 1012 10 (c) 4.1–4.1 1 / 3
HC15N 4.1 × 1011 10 (c) 4.1–4.1 1
H13C15N 1.2 × 1010 10 (c) 4.0–4.0 1
HNC > 7.8 × 1012 10 (c) 4.4–4.4 1
HN13C > 3.7 × 1012 10 (c) 4.2–4.2 1
H15NC 8.2 × 1011 10 (c) 4.3–4.3 1
H15N13C 2.8 × 1010 10 (c) 4.1–4.1 1
H2CN (f) 2.4 × 1012 10 (c) 3.5–3.5 9 / 13
C3N 2.9(18) × 1012 8.5(15) 21.4–31.3 6
HC3N 4.2 × 1013 9.1 (c) 19.6–28.8 6 / 10
H13CCCN 4.6 × 1011 9.1 (c) 23.3–33.0 3
HC13CCN 4.5 × 1011 9.1 (c) 19.6–33.9 4
HCC13CN 5.3(3.1) × 1011 9.1(16) 19.6–33.9 4
HC315N 8.6 × 1010 9.1 (c) 23.3–28.0 2
DC3N 1.2 × 1012 9.1 (c) 22.3–36.9 4
DC13CCN 3.9 × 1010 9.1 (c) 22.2–22.2 1
HCCNC 5.7 × 1011 9.1 (c) 21.5–31.5 3
HNC3 5.0 × 1010 9.1 (c) 20.2–24.6 2
HC5N 7.6(28) × 1011 28(3) 63.4–110.0 11
CH2CN 1.2 × 1012 10 (c) 8.8–13.7 8 / 37
CH3CN 4.1 × 1011 10 (c) 12.4–18.5 4 / 5
CH2DCN 5.4 × 1010 10 (c) 12.5–18.0 4
CH3NC 3.7 × 1010 10 (c) 13.5–14.5 2 / 3
CH3C3N 5.0 × 1011 10 (c) 41.6–45.8 2 / 4
C2H3CN 1.9 × 1011 10 (c) 20.4–29.2 7
CNCN 1.9 × 1012 10 (c) 17.9–27.3 3
HNO 1.2 × 1012 10 (c) 3.9–3.9 1
N2O 5.8 × 1012 10 (c) 12.1–12.1 1
NCO 2.2 × 1012 10 (c) 6.6–11.7 10
HNCO 1.7 × 1013 10 (c) 10.5–15.8 4 / 6
HN13CO 2.7 × 1011 10 (c) 10.5–15.8 2
HNC18O 7.2 × 1010 10 (c) 10.0–10.0 1
DNCO 6.4 × 1011 10 (c) 9.8–14.7 2
HOCN 1.5 × 1011 10 (c) 10.1–15.1 2
HCNO 7.0 × 1010 10 (c) 11.0–16.5 2
N2H+ > 6.0 × 1013 10 (c) 4.5–4.5 1 / 7
15NNH+ 8.0 × 1010 10 (c) 4.3–4.3 3
N15NH+ 1.3 × 1011 10 (c) 4.4–4.4 3
HCNH+(f) 2.7 × 1013 10 (c) 3.6–3.6 1
HC3NH+ 2.3 × 1011 9.1 (c) 22.9–27.4 2
NCCNH+ 1.5 × 1010 10 (c) 23.4–28.1 2
H2NCO+ 2.9 × 1010 10 (c) 8.7–14.6 6
S-bearing molecules
CS > 2.3 × 1013 10 (c) 7.1–7.1 1
13CS 1.7 × 1012 10 (c) 6.7–6.7 1
C34S 3.2 × 1012 10 (c) 6.9–6.9 1
C33S 8.1 × 1011 10 (c) 7.0–7.0 4
13C34S 5.5 × 1010 10 (c) 6.5–6.5 1
C2S 4.9(39) × 1012 8.8(19) 23.3–33.6 5 / 8
C234S 2.9 × 1011 8.8 (c) 19.5–24.5 2 / 3
C13CS 1.7 × 1011 8.8 (c) 15.3–15.3 2 / 4
C3S 1.2(6) × 1012 9.6(11) 29.1–52.7 5 / 6
HCS 7.3 × 1012 10 (c) 5.8–5.8 5
HSC 2.0 × 1011 10 (c) 5.9–5.9 1 / 2
H2CS 1.4 × 1013 8.0 (c) 8.1–9.9 3
H213CS 1.2 × 1011 8.0 (c) 7.8–9.5 3
H2C34S 4.6 × 1011 8.0 (c) 8.0–8.3 2 / 3
HDCS 1.9(10) × 1012 8.0(18) 8.9–18.1 3
D2CS 6.2 × 1011 8.0 (c) 6.6–13.6 5
CH3SH 2.4 × 1012 10 (c) 8.4–8.5 2 / 4
SO 2.0 × 1014 4.5 (c) 19.3–21.1 2 / 4
34SO 6.5(36) × 1012 4.5(5) 9.1–20.9 3
33SO 1.4 × 1012 4.5 (c) 9.2–9.2 4 / 5
S18O 1.3 × 1012 4.5 (c) 8.7–8.7 1
S17O 1.6 × 1012 4.5 (c) 9.0–9.0 1
SO2 4.0(12) × 1012 7.9(7) 7.7–36.7 2
34SO2 1.3 × 1011 7.9 (c) 7.6–7.6 1
OCS 1.6(12) × 1013 7.8(17) 16.3–26.3 3
NS 5.4 × 1012 10 (c) 8.8–8.9 10
N34S 2.4 × 1011 10 (c) 8.7–8.7 2
HNCS 2.1 × 1011 10 (c) 15.8–25.3 3
HSCN 1.1 × 1011 10 (c) 15.4–19.8 2
HCS+ 1.3 × 1012 10 (c) 6.1–6.1 1
HC34S+ 6.3 × 1010 10 (c) 6.0–6.0 1
SO+ 1.6 × 1012 4.5 (c) 8.9–8.9 1
NS+ 2.1 × 1011 10 (c) 7.2–7.2 4
Si-bearing molecules
SiO 2.6 × 1011 10 (c) 6.3–6.3 1

Notes. Numbers in parentheses are 1σ uncertainties in units of the last digits. Fractional abundances relative to H2 can be directly computed from the column densities listed using a column density of H2 of 4 × 1022 cm−2 (see Sect. 4.2). (a)The error in the column density for those species for which the rotational temperature has been fixed is estimated to be 50% (see text). (b) Number of lines observed. The notation x∕y means that x lines, out of y observed lines, were included in the determination of the column density. (c) Rotational temperature has been fixed. (d) Impossible to fit lines to a rotational diagram. The column density of CH3OH is estimated to be 2.9 × 1014 cm−2 based on 13CH3OH and adopting a 12C/13C isotopic ratio of 68 (Milam et al. 2005). (e)Tentative detection. (f)Molecule observed at frequencies below 80 GHz (Agúndez et al., unpublished data).

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