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Home All issues Volume 525 (January 2011) A&A, 525 (2011) A77 Full HTML
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Table 3

Parameters of the best-fit LTE models of SH+, 13CH+, and c-C3H2, as well as the alternative LTE model of H13CO+ fitted with the same velocity components as c-C3H2.

SH+ 13CH+ c-C3H2 H13CO+
n c a V lsr b ΔVc d N e N e R 13 f R 12 g N e R h N e R 12 i
(km s-1) (km s-1) (cm-2) (cm-2) (cm-2) (cm-2)
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12)
1 – – – – – – – 2.4 × 1014 – – –
2 64.0 19.0 20 2.0 × 1014 1.8 × 1013 10.8 0.53 1.9 × 1014 1.0 1.4 × 1014 0.07
3 38.5 5.0 40  <2.8 × 1012 3.8 × 1011  <7.4  <0.18 4.2 × 1012  <0.7 2.4 × 1011  <0.29
4 32.0 5.0 40  <2.8 × 1012  <1.6 × 1011 – – 4.7 × 1012  <0.6 7.8 × 1011  <0.09
5 22.0 5.0 60 1.1 × 1013  <1.6 × 1011  >70.6  >1.15 4.1 × 1012 2.8 2.5 × 1012 0.07
6 17.0 5.0 60 2.1 × 1013 9.6 × 1011 22.1 0.36 5.9 × 1012 3.6 2.0 × 1012 0.17
7 12.0 6.0 60 2.8 × 1013 1.4 × 1012 19.6 0.32 2.7 × 1012 10.5 1.8 × 1012 0.25
8 8.2 5.0 20 2.5 × 1013 2.1 × 1012 12.2 0.60 8.1 × 1012 3.2 6.0 × 1011 2.06
9 2.5 5.0 20 1.8 × 1013 3.5 × 1012 5.2 0.26 9.7 × 1012 1.9 3.0 × 1012 0.30
10 –2.5 4.5 20 1.1 × 1013 1.9 × 1012 5.9 0.29 5.4 × 1012 2.1 1.2 × 1012 0.46
11 –8.7 5.0 20 1.6 × 1013 1.6 × 1012 9.7 0.48 1.4 × 1012 11.1 3.2 × 1011 2.38
12 –15.5 6.0 40 8.4 × 1012 2.9 × 1012 2.9 0.07 3.2 × 1012 2.6 3.6 × 1011 0.57
13 –20.0 5.0 40 8.4 × 1012 1.6 × 1012 5.3 0.13 2.7 × 1012 3.2 5.4 × 1011 0.38
14 –25.0 6.0 40 8.4 × 1012 2.5 × 1012 3.3 0.08 5.6 × 1012 1.5 5.4 × 1011 0.38
15 –29.5 4.0 40 8.4 × 1012 8.0 × 1011 10.6 0.26 2.1 × 1012 3.9 3.3 × 1011 0.63
16 –35.5 4.0 40 8.4 × 1012 4.8 × 1011 17.7 0.43 2.7 × 1011 31.5 1.5 × 1011 1.38
17 –41.3 3.3 40 7.0 × 1012 7.3 × 1011 9.6 0.24 4.5 × 1012 1.6 1.6 × 1012 0.11
18 –45.7 3.0 40 4.2 × 1012 8.0 × 1011 5.3 0.13 2.6 × 1012 1.6 5.5 × 1011 0.19
19 –49.0 3.0 40 4.2 × 1012 7.7 × 1011 5.5 0.14 3.0 × 1012 1.4 2.9 × 1011 0.36
20 –53.5 4.0 20 9.3 × 1012 9.2 × 1011 10.0 0.49 1.2 × 1012 7.9 2.0 × 1011 2.29
21 –58.7 4.0 20  <2.8 × 1012 7.0 × 1011  <4.0  <0.20 3.2 × 1012  <0.9 6.6 × 1011  <0.21
22 –69.8 6.0 20 9.9 × 1012 2.1 × 1012 4.8 0.23 1.6 × 1012 6.1 5.1 × 1011 0.96
23 –76.0 4.5 20 9.0 × 1012 1.6 × 1012 5.7 0.28 3.3 × 1012 2.7 5.1 × 1011 0.86
24 –80.1 4.0 20 7.0 × 1012 1.1 × 1012 6.3 0.31 4.8 × 1011 14.6 2.4 × 1011 1.43
25 –84.3 5.0 20 1.3 × 1013 2.5 × 1012 5.0 0.24 9.1 × 1011 13.9 5.1 × 1011 1.21
26 –88.5 4.0 20  <2.8 × 1012 1.8 × 1012  <1.6  <0.08 1.5 × 1012  <1.9 4.5 × 1011  <0.31
27 –93.0 4.0 20 9.9 × 1012 1.4 × 1012 6.9 0.34 2.5 × 1012 4.0 6.0 × 1011 0.80
28 –97.5 4.0 20 1.4 × 1013 1.1 × 1012 12.6 0.62 2.0 × 1012 6.9 6.0 × 1011 1.15
29 –101.8 4.0 20 1.1 × 1013 9.6 × 1011 11.8 0.58 4.3 × 1012 2.6 1.1 × 1012 0.48
30 –106.2 4.0 20 1.1 × 1013 4.5 × 1011 25.2 1.24 4.1 × 1012 2.8 6.0 × 1011 0.92
31 –111.6 4.0 20 8.4 × 1012  <1.6 × 1011  >53.0  > 2.60 8.6 × 1011 9.8 5.4 × 1011 0.76
32 –116.0 4.0 20 1.4 × 1013  <1.6 × 1011  > 88.3  > 4.33 4.3 × 1011 32.8 4.2 × 1011 1.64

Notes. All components have a rotation temperature of 2.7 K except components nc = 1 and 2 of c-C3H2 which have 15.0 and 3.0 K, respectively, and component nc =  2 of H13CO+ which has 3.1 K. The emission components of the H13CO+ model are the same as in Table 4 and are not listed here.

(a)

Component number.

(b)

LSR velocity, the same for all four molecules except for 1 component of 13CH+ (2: 68.7 km s-1), 2 components of c-C3H2 (1: 61.0 km s-1, 2: 65.0 km s-1), and 1 component of H13CO+ (2: 64.5 km s-1).

(c)

Linewidth (FWHM), the same for all four molecules except for 2 components of c-C3H2 (1:15.0 km s-1, 2:11.0 km s-1) and for 1 component of H13CO+ (2: 12.0 km s-1).

(d)

Assumed 12C/13C isotopic ratio for HCO+ and CH+.

(e)

Column density.

(f)

Column density ratio SH+/13CH+.

(g)

Column density ratio SH+/12CH+.

(h)

Column density ratio SH+/c-C3H2.

(i)

Column density ratio SH+/HCO+.

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