J/A+A/504/853 Molecular lines in 5 massive dense cores (Herpin, 2009)
S-bearing molecules in massive dense cores
Herpin F., Marseille M., Wakelam V., Bontemps S., Lis D.C.
<Astron. Astrophys. 504, 853 (2009)>
=2009A&A...504..853H 2009A&A...504..853H
ADC_Keywords: Interstellar medium ; Infrared sources ; Line Profiles
Keywords: ISM: individual objects: W43MM1, IRAS18264-1152, IRAS05358+3543,
IRAS18162-2048 - ISM: abundances - stars: formation - line: profiles
Abstract:
Two mid-infrared quiet and two brighter massive cores were observed in
various transitions (Eup up to 289K) of CS, OCS, H2S, SO, and
SO2 and of their 34S isotopologues at mm wavelengths with the IRAM
30m and CSO telescopes. The 1D modeling of the dust continuum is used
to derive the density and temperature laws, which were then applied in
the RATRAN code to modeling the observed line emission and to deriving
the relative abundances of the molecules. All lines are detected,
except the highest energy SO2 transition. Infall (up to 2.9km/s) may
be detected towards the core W43MM1. We propose an evolutionary
sequence of our sources (W43MM1 - IRAS18264-1152 - IRAS05358+3543 -
IRAS18162-2048), based on the SED analysis. The analysis of the
variations in abundance ratios from source to source reveals that the
SO and SO2 relative abundances increase with time, while CS and OCS
decrease. Molecular ratios, such as [OCS/H2S], [CS/H2S], [SO/OCS],
[SO2/OCS], [CS/SO], and [SO2/SO] may be good indicators of
evolution, depending on layers probed by the observed molecular
transitions. Observations of molecular emission from warmer layers, so
that involving higher upper energy levels must be included.
Description:
The figure 14-17 show some line profiles (not shown in the paper) from
observations with the IRAM-30m and CSO telescopes (all observational
parameters can be found in the Table 2 of the paper). The reduced data
for all the observed lines are given in the individual fit files,
labelled as follows: os-l.fit, where "o" represents the observed
source and is "i1" for IRAS05358+3543, "i2" for IRAS18162-2048,
"i3" for IRAS18264-1152, and "w" for W43MM1, respectively; "s" is
the species (e.g. CS); "l" is the first number (level) of the line
transition (e.g. "3" for "3-2"). The Tables 6-9 give all the
parameters for the observed line emissions. Table 10 shows the
opacities derived from modeling the molecular emission of the sources.
Objects:
------------------------------------------------------------------------
RA (2000) DE Designation(s) (Table)
------------------------------------------------------------------------
18 47 47.0 -01 54 28 W43MM1 = [MSL2003] W43-MM1 (table6.dat)
18 29 14.3 -11 50 26 IRAS18264-1152 = IRAS 18264-1152 (table7.dat)
05 39 10.4 +35 45 19 IRAS05358+3543 = IRAS 05358+3543 (table8.dat)
18 19 11.8 -20 47 35 IRAS18162-2048 = IRAS 18162-2048 (table9.dat)
------------------------------------------------------------------------
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table6.dat 114 25 Observed line emissions parameters for W43MM1
table7.dat 115 25 Observed line emissions parameters for IRAS18264-1152
table8.dat 115 25 Observed line emissions parameters for IRAS05358+3543
table9.dat 115 25 Observed line emissions parameters for IRAS18162-2048
table10.dat 55 24 Opacities derived from modeling the molecular
emission of the sources
fits/* . 78 Individual line profiles
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Byte-by-byte Description of file: table6.dat table7.dat table8.dat table9.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Species Species
11- 27 A17 --- Trans Observed line transition
30- 33 F4.2 km/s dV ? Linewidth
35- 38 F4.2 km/s e_dV ? rms uncertainty on dV
40 A1 --- u_dV [?] Uncertainty flag on dV
42- 45 F4.2 K Tmb ? Main beam temperature
46 A1 --- u_Tmb [?] Uncertainty flag on Tmb
48- 50 I3 mK e_Tmb ? rms uncertainty on Tmb
53 A1 --- l_Flux Limit flag on Flux
54- 59 F6.3 K.km/s Flux ? Integrated flux
61- 64 F4.2 K.km/s e_Flux ? rms uncertainty on Flux
66 A1 --- ueFlux [?] Uncertainty flag on Flux
69- 73 F5.2 km/s dV3s ? linewidth at 3 sigma
74 A1 --- u_dV3s [?] Uncertainty flag on dV3s
77- 80 F4.2 km/s dV1/2 ? half-power linewidth
81 A1 --- u_dV1/2 [?] Uncertainty flag on dV1/2
82 A1 --- Flag [abcdfg] Flag on profile (1)
88-101 A14 --- Com Comments
103-115 A13 --- FileName Name of the fits file in subdirectory fits
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Note (1): Flags as follows:
a = self-absorption at dV_source
b = line blend with H2CO line from image band
c = unidentified line at 34.87km/s (216.716GHz)
d = + other line at 29.1km/s (135.78223GHz),
Tmb=0.14K, δ=1.1km/s, Tmbδ=0.17
f = detected at 2σ with two peaks at -15.57 and -16.21km/s
g = unidentified lines at 216.701026 and 216.71.6GHz (25 and 4km/s)
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Byte-by-byte Description of file: table10.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- Species Species
11- 27 A17 --- Trans Observed line transition
29- 34 F6.2 --- Opac1 ? Line opacity for source W43MM1
35- 36 A2 --- n_Opac1 [ND] ND for no data
38- 41 F4.2 --- Opac2 Line opacity for source IRAS18264-1152
43- 46 F4.2 --- Opac3 ? Line opacity for source IRAS05358+3543
47- 48 A2 --- n_Opac3 [ND] ND for no data
50- 53 F4.2 --- Opac4 ? Line opacity for source IRAS18162-2048
54- 55 A2 --- n_Opac4 [ND] ND for no data
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Acknowledgements:
Fabrice Herpin, herpin(at)obs.u-bordeaux1.fr
(End) Fabrice Herpin [LAB/OASU, France], Patricia Vannier [CDS] 17-Jul-2009