2005A&A...430..549W

Query : 2005A&A...430..549W

2005A&A...430..549W - Astronomy and Astrophysics, volume 430549-560 (2005/2-1)

The interstellar C18O/C17O ratio in the solar neighbourhood: The ρ Ophiuchus cloud.

WOUTERLOOT J.G.A., BRAND J. and HENKEL C.

Abstract (from CDS):

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. An average 12C18O/12C17O isotopomeric ratio of 4.11±0.14, reflecting the 18O/17O isotope ratio, is derived from Large Velocity Gradient (LVG) calculations. From LTE column densities we derive a ratio of 4.17±0.26. These calculations also show that the kinetic temperature decreases from about 30K in the cloud envelope to about 10K in the cloud cores. This decrease is accompanied by an increase of the average molecular hydrogen density from 104cm–3 to >105cm–3. Towards some lines of sight C18O optical depths reach values of order unity.

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Journal keyword(s): ISM: abundances - ISM: clouds - ISM: molecules - Galaxy: abundances - radio lines: ISM - ISM: individual objects: rho Oph

VizieR on-line data: <Available at CDS (J/A+A/430/549): table2.dat table3.dat spectra.dat sp/*>

Simbad objects: 14

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Number of rows : 14
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3588 2
2 NAME [BM89] B5 DNe 03 47 38.3 +32 52 43           ~ 224 0
3 LDN 1471 DNe 03 48.0 +32 54           ~ 349 0
4 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
5 NGC 4945 Sy2 13 05 27.279 -49 28 04.44   9.31 14.40 7.55   ~ 1582 2
6 NAME rho Oph A Cloud MoC 16 26 26.4 -24 22 33           ~ 312 1
7 NAME rho Oph C Cloud MoC 16 26 53.1 -24 32 31           ~ 80 0
8 NAME rho Oph E MoC 16 27 02.0 -24 38 31           ~ 65 0
9 NAME rho Oph Cloud B1 PoC 16 27 10.5 -24 29 30           ~ 54 1
10 NAME rho Oph B2 Cloud PoC 16 27 27.9 -24 26 29           ~ 86 1
11 NAME rho Oph F MoC 16 27 37.3 -24 42 28           ~ 65 0
12 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3969 1
13 NAME Ophiuchus D MoC 16 28 29.2 -24 18 25           ~ 122 0
14 IC 5146 OpC 21 53 29.3 +47 14 46           ~ 507 2

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