J/A+A/430/549 C18O/C17O near rho Oph (Wouterloot+, 2005)
The interstellar C18O/C17O ratio in the solar neighbourhood:
The ρ Ophiuchus cloud.
Wouterloot J.G.A., Brand J., Henkel C.
<Astron. Astrophys., 430, 549-560 (2005)>
=2005A&A...430..549W 2005A&A...430..549W
ADC_Keywords: Molecular clouds ; Carbon monoxide ; Interstellar medium ;
Radio lines
Keywords: ISM: abundances - ISM: clouds - ISM: molecules - Galaxy: abundances -
radio lines: ISM - ISM: individual objects: rho Oph
Abstract:
Observations of up to ten carbon monoxide (CO and isotopomers)
transitions are presented to study the interstellar C18O/C17O
ratio towards 21 positions in the nearby (d∼140pc) low-mass star
forming cloud ρ Oph. A map of the C18O J=1-0 distribution of
parts of the cloud is also shown.
Description:
Between September 19 and October 5, 1987 we used the 15-m Swedish-ESO
Submillimeter Telescope (SEST) to map C18O(1-0) towards a part of
the ρ Oph cloud.
Between January 26 and 31, 1999 we used two SIS receivers at the SEST
to observe 12CO, 13CO, C18O, and C17O J=1-0 and 2-1 towards 21
positions in the ρ Oph cloud.
On July 14, 2001, we observed C17O(3-2) towards eight of the 21
positions with the 15-m James Clerk Maxwell Telescope (JCMT) using
frequency switching.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 93 21 Observed sources and rms values (K on a TA*
scale) for individual transitions
table3.dat 136 21 Observed C17O, C18O, and 13CO (1-0), (2-1)
and (3-2) integrated line intensities and line
ratios (i.e. not corrected for the frequency
difference)
spectra.dat 203 21 List of available spectra
sp/* . 182 Individual spectra
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Pos [1,21] Position number
4- 5 I2 h RAh Right ascension (1950)
7- 8 I2 min RAm Right ascension (1950)
10- 13 F4.1 s RAs Right ascension (1950)
15 A1 --- DE- Declination sign (1950)
16- 17 I2 deg DEd Declination (1950)
19- 20 I2 arcmin DEm Declination (1950)
22- 23 I2 arcsec DEs Declination (1950)
25- 30 F6.2 arcmin ORA Offset in right ascension (1)
32- 37 F6.2 arcmin ODE Offset in declination (1)
39- 44 F6.4 --- rmsC17O(1-0) rms of C17O(1-0) transition, 112.36GHz
46- 50 F5.3 --- rmsC17O(2-1) rms of C17O(2-1) transition, 224.71GHz
52- 56 F5.3 --- rmsC17O(3-2) ? rms of C17O(3-2) transition, 337.08GHz
58- 62 F5.3 --- rmsC18O(1-0) rms of C18O(1-0) transition, 109.78GHz
64- 68 F5.3 --- rmsC18O(2-1) rms of C18O(2-1) transition, 219.56GHz
70- 73 F4.2 --- rmsC18O(3-2) ? rms of C18O(3-2) transition, 329.33GHz
75- 78 F4.2 --- rms13CO(1-0) rms of 13CO(1-0) transition, 110.20GHz
80- 83 F4.2 --- rms13CO(2-1) rms of 13CO(2-1) transition, 220.40GHz
85- 88 F4.2 --- rms12CO(1-0) rms of 12CO(1-0) transition, 115,27GHz
90- 93 F4.2 --- rms12CO(2-1) rms of 12CO(2-1) transition, 230,54GHz
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Note (1): Offset with respect to RA = 16 24 10, DE = -24 23 (1950)
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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- 2 I2 --- Pos [1,21] Position number
4- 7 F4.2 K.km/s IC17O(1-0) C17O(1-0) line integrated intensity
9- 12 F4.2 K.km/s IC17O(2-1) C17O(2-1) line integrated intensity
14- 17 F4.2 K.km/s IC17O(3-2) ? C17O(3-2) line integrated intensity
19- 22 F4.2 K.km/s IC18O(1-0) C18O(1-0) line integrated intensity
24- 28 F5.2 K.km/s IC18O(2-1) C18O(2-1) line integrated intensity
30- 33 F4.2 K.km/s IC18O(3-2) ? C18O(3-2) line integrated intensity
35- 39 F5.2 K.km/s I13CO(1-0) 13CO(1-0) line integrated intensity
41- 45 F5.2 K.km/s I13CO(2-1) 13CO(2-1) line integrated intensity
47- 50 F4.2 --- C18O/C17O(1-0) C18O/C17O (1-0) line ratio
52- 55 F4.2 --- C18O/C17O(2-1) C18O/C17O (2-1) line ratio
57- 60 F4.2 --- C18O/C17O(3-2) ? C18O/C17O(3-2) line ratio
62- 66 F5.2 --- 13CO/C18O(1-0) 13CO/C18O (1-0) line ratio
68- 71 F4.2 --- 13CO/C18O(2-1) 13CO/C18O (2-1) line ratio
73- 76 F4.2 K.km/s e_IC17O(1-0) rms uncertainty on IC17O(1-0)
78- 81 F4.2 K.km/s e_IC17O(2-1) rms uncertainty on IC17O(2-1)
83- 86 F4.2 K.km/s e_IC17O(3-2) ? rms uncertainty on IC17O(3-2)
88- 91 F4.2 K.km/s e_IC18O(1-0) rms uncertainty on IC18O(1-0)
93- 96 F4.2 K.km/s e_IC18O(2-1) ? rms uncertainty on IC18O(2-1)
98-101 F4.2 K.km/s e_IC18O(3-2) ? rms uncertainty on IC18O(3-2)
103-106 F4.2 K.km/s e_I13CO(1-0) rms uncertainty on I13CO(1-0)
108-111 F4.2 K.km/s e_I13CO(2-1) rms uncertainty on I13CO(2-1)
113-116 F4.2 --- e_C18O/C17O(1-0) rms uncertainty on C18O/C17O (1-0)
118-121 F4.2 --- e_C18O/C17O(2-1) rms uncertainty on C18O/C17O (2-1)
123-126 F4.2 --- e_C18O/C17O(3-2) ? rms uncertainty on C18O/C17O(3-2)
128-131 F4.2 --- e_13CO/C18O(1-0) rms uncertainty on 13CO/C18O (1-0)
133-136 F4.2 --- e_13CO/C18O(2-1) rms uncertainty on 13CO/C18O (2-1)
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Byte-by-byte Description of file: spectra.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Pos [1,21] Position number
4- 5 I2 h RAh Right ascension (1950)
7- 8 I2 min RAm Right ascension (1950)
10- 13 F4.1 s RAs Right ascension (1950)
15 A1 --- DE- Declination sign (1950)
16- 17 I2 deg DEd Declination (1950)
19- 20 I2 arcmin DEm Declination (1950)
22- 23 I2 arcsec DEs Declination (1950)
25- 41 A17 --- C17O(1-0) File with C17O(1-0) spectrum in sp/
43- 59 A17 --- C17O(2-1) File with C17O(2-1) spectrum in sp/
61- 77 A17 --- C17O(3-2) File with C17O(3-2) spectrum in sp/
79- 95 A17 --- C18O(1-0) File with C18O(1-0) spectrum in sp/
97-113 A17 --- C18O(2-1) File with C18O(2-1) spectrum in sp/
115-131 A17 --- C18O(3-2) File with C18O(3-2) spectrum in sp/
133-149 A17 --- 12CO(1-0) File with 12CO(1-0) spectrum in sp/
151-167 A17 --- 12CO(2-1) File with 12CO(2-1) spectrum in sp/
169-185 A17 --- 13CO(1-0) File with 13CO(1-0) spectrum in sp/
187-203 A17 --- 13CO(2-1) File with 13CO(2-1) spectrum in sp/
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Acknowledgements: Jan Wouterloot, j.wouterloot(at)jach.hawaii.edu
(End) Patricia Vannier [CDS] 03-Feb-2005