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Table 1

Density and column densities derived from the models.

Molecule n(H2)(cm−3) N(cm−2) Notes
CS 2.0 × 104 1.1 × 1014 a
C34S 0.9 × 104 9.9 × 1012 b
C33S 0.9 × 104 2.7 × 1012
C36S 1.3 × 104 2.8 × 1010
13CS 0.7 × 104 2.6 × 1012
13C34S 1.3 × 104 1.1 × 1011
13C33S 0.9 × 104 3.1 × 1010 c
HCS+ 0.9 × 104 5.5 × 1012
H13CS+ 1.0 × 104 6.0 × 1010
HC34S+ 1.0 × 104 2.5 × 1011
HC33S+ 1.0 × 104 8.0 × 1010 d
CCS 1.3 × 104 3.4 × 1013
CC34S 1.3 × 104 1.5 × 1012
CC33S 1.3 × 104 3.5 × 1011
13CCS 1.3 × 104 8.4 × 1010
C13CS 1.3 × 104 5.7 × 1011
C13C34S 1.0 × 104 1.8 × 1010
CCCS 1.3 × 104 6.8 × 1012
CCC34S 1.3 × 104 2.7 × 1011
CCC33S 1.3 × 104 6.2 × 1010
13CCCS 1.3 × 104 2.2 × 1010
C13CCS 1.3 × 104 7.4 × 1010
HCCS+ 1.1 × 1012 e
HCC34S+ 4.7 × 1010 f
H2CS 1.5 × 104 3.7 × 1013
H2C34S 1.5 × 104 1.5 × 1012
H2C33S 1.5 × 104 4.2 × 1011 g
H213CS 1.5 × 104 4.5 × 1011
C4S 4.0 × 104 3.8 × 1010 h
C5S 5.0 × 104 3.0 × 1010 i

Notes. The estimated absolute uncertainties for the column densities are 10%. The relative uncertainties for the column densities of the isotopologues of a given species are better than 5%, however, i.e. the relative calibration of the observed lines in the QUIJOTE line survey. (a)Underestimated by the opacity of the J=1–0 and 2–1 transitions of CS. A two-layer model is needed to explain the observed intensities (see Section 4.1). (b)A small opacity effect in the J=2–1 line of C34S may exist (see text). (c)The lines of 13C33S are weak. The column density was derived from the intensities of the two hyperfine components of the J=1–0 transition, which are detected above 5σ (see Fig. 3). (d)Kinetic temperatures estimated from HC34S+ adopting the same value of TK for all hyperfine components of HC33S+ (see Section 4.2). (e)Column density from Cabezas et al. (2022b). (f)The rotational temperatures were assumed to be identical to those of CC34S (see text). (g)Derived adopting a rotational temperature of 8 K and an ortho/para ratio identical to that estimated for the other isotopologues of H2CS (see text). (h)Very uncertain determination of n(H2). A similar column density is obtained assuming an uniform rotational temperature of 8 K (see Appendix A.7). (i)A similar column density is obtained assuming a uniform kinetic temperature of 8.5 K (see Appendix A.8).

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