J/A+A/358/257 Molecular clouds SO and CS obs. II. (Nilsson+, 2000)
SO and CS observations of molecular clouds.
II. Analysis and modelling of the abundance ratios - probing O2/CO with SO/CS?
Nilsson A., Hjalmarson A., Bergman P., Millar T.J.
<Astron. Astrophys. 358, 257 (2000)>
=2000A&A...358..257N 2000A&A...358..257N
ADC_Keywords: Abundances ; Interstellar medium ; Radio sources
Keywords: ISM: clouds - ISM: molecules - ISM: abundances - ISM: structure
Abstract:
We here analyse the observational SO and CS data presented in Nilsson
et al. (2000A&AS..144..441N 2000A&AS..144..441N). The SO/CS integrated intensity ratio
maps are presented for 19 molecular clouds, together with tables of
relevant ratios at strategic positions, where w e have also observed
34SO and/or C34S.
Description:
In the article we present a comparison between observations and
chemical models. The modelled observations are presented in the
article and the images for the time-dependent chemical modelling
results are presented here.
Objects:
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RA (2000) DE Designation(s)
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02 25 30.9 +62 06 21 W3(IRS4)
02 27 04.1 +61 52 22 W3(OH)
03 29 02.0 +31 20 54 NGC 1333
05 35 17.4 -05 23 28 Orion A
05 35 27 -05 10 06 OMC 2
05 45 15 -05 00 18 OMC 3
05 41 37.9 -02 15 52 NGC 2023
05 41 43.5 -01 54 17 NGC 2024
05 46 46.7 +00 00 50 NGC 2068
05 47 04.4 +00 21 19 NGC 2071
06 07 46.3 -06 23 09 Mon R2
06 41 09.7 +09 29 36 NGC 2264 IR
18 53 18.5 +01 14 57 G 34.3+0.2
19 10 13.2 +09 06 12 W 49N
19 23 40.0 +14 30 51 W 51N
20 39 00.9 +42 22 38 DR 21(OH)
21 40 42.4 +58 16 10 IRAS 21391+5802
22 19 18.1 +63 18 49 S 140
23 13 45.3 +61 28 10 NGC 7538 (IRS 1)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.ps 132 105 SIMBAD objects and sign captions as displayed
in the ratio maps, Figs. 1a-v
table2.dat 77 22 Maxima and minima of SO/CS integrated intensity
ratios
table3.dat 80 92 Integrated intensity ratios (A-E) and estimated
abundance ratios (F) at certain positions
tab2-3.tex 79 247 LaTeX version of tables 2 & 3
fig4.ps 96 1088 Species abundances vs time (O/C+ = 2.4)
fig5.ps 96 566 SO/CS abundance ratio vs time (O/C+ = 2.4)
fig6.ps 96 918 SO/CS abundance ratio vs time for
different O/C+ ratios
fig7.ps 96 614 O2/SO abundance ratio vs time (O/C+ = 2.4)
fig8.ps 96 566 O2/CO abundance ratio vs time (O/C+ = 2.4)
fig9.ps 96 918 O2/CO abundance ratio vs time for
different O/C+ ratios
fig10.ps 96 831 SO/CS abundance ratio vs time for
different cloud densities
fig11.ps 96 918 SO/CS abundance ratio vs time for
different ionization rate scaling factors F,
F = 1 for standard C.R. flux
fig12.ps 96 918 SO/CS abundance ratio vs time for
different initial S+ abundances
fig13.ps 96 831 O2/CO abundance ratio vs time for
different cloud densities
fig14.ps 96 918 O2/CO abundance ratio vs time for different
ionization rate scaling factors F,
F = 1 for standard C.R. flux
fig15.ps 96 918 O2/CO abundance ratio vs time for
different initial S+ abundances
fig16.ps 96 1002 H3+ fractional abundance vs time for
different ionization rate scaling factors F,
F=1 for standard C.R. flux
fig17.ps 96 1002 C fractional abundance vs time for
different ionization rate scaling factors F
fig18.ps 96 948 CS fractional abundance vs time for
different ionization rate scaling factors F
fig19.ps 96 918 OH fractional abundance vs time for
different ionization rate scaling factors F
fig20.ps 96 1020 C+ fractional abundance vs time for
different ionization rate scaling factors F
fig21.ps 96 966 h2O fractional abundance vs time for
different ionization rate scaling factors F
all.ps 132 16324 table 1 and figures 4 to 21
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See also:
J/A+AS/144/441 : Molecular clouds SO and CS obs. I. (Nilsson+, 2000)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Source Source name
17- 27 A11 ---- n_Source Note (isotopomers or Residual)
29- 30 I2 h RAh Right ascension (J2000.0)
32- 33 I2 min RAm Right ascension (J2000.0)
35- 38 F4.1 s RAs Right ascension (J2000.0)
40 A1 --- DE- Declination sign (J2000.0)
41- 42 I2 deg DEd Declination (J2000.0)
44- 45 I2 arcmin DEm Declination (J2000.0)
47- 48 I2 arcsec DEs Declination (J2000.0)
50- 53 I4 arcsec ORAMax Maximum offset in right ascension
55- 58 I4 arcsec ODEMax Maximum offset in declination
60- 63 F4.2 --- RatioMax Maximum ratio of SO/CS
65- 67 I3 arcsec ORAMin Minimum offset in right ascension
69- 72 I4 arcsec ODEMin Minimum offset in declination
74- 77 F4.2 --- RatioMin Minimum ratio of SO/CS
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Source Source name
18- 21 I4 arcsec ORA Offset in right ascension from source
23- 26 I4 arcsec ODE Offset in declination from source
28- 31 F4.1 --- RatioA ? SO(32-21)/34SO(32-21) ratio
33- 35 F3.1 --- e_RatioA ? rms uncertainty on RatioA (1)
37- 40 F4.1 --- RatioB ? CS(2-1)/C34S(2-1) ratio
42- 44 F3.1 --- e_RatioB ? rms uncertainty on RatioB (1)
46- 49 F4.2 --- RatioC ? SO(32-21)/CS(2-1) ratio
51- 54 F4.2 --- e_RatioC ? rms uncertainty on RatioC (1)
56- 59 F4.2 --- RatioD ? 34SO(32-21)/C34S(2-1) ratio
61- 64 F4.2 --- e_RatioD ? rms uncertainty on RatioD (1)
66- 69 F4.2 --- RatioE ? Adopted SO/CS ratio (2)
71- 74 F4.2 --- e_RatioE ? rms uncertainty on RatioE (1)
76 A1 --- Note [abcd] Note (3)
78- 80 F3.1 --- RadioF Ratio [SO]/[CS]
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Note (1): An error of (0.00) means 1σ error <0.005
Note (2): Adopted SO/CS ratio, calculated for optically thin lines,
Tex=20K (see text).
Note (3): Explanations of the adopted SO/CS ratio:
a: 34SO(32-21)/C34S(2-1)
b: SO(32-21)/(22 x C34S(2-1))
c: 22 x 34SO(32-21)/CS(2-1)
d: SO(32-21)/CS(2-1)
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Acknowledgements: Per Bergman
(End) Patricia Bauer [CDS] 22-Jun-2000