2004A&A...421.1087H


Query : 2004A&A...421.1087H

2004A&A...421.1087H - Astronomy and Astrophysics, volume 421, 1087-1099 (2004/7-3)

The relationship of CO abundance to extinction and N(H2): Observations of globules and the dependence on star formation activity.

HARJUNPAEAE P., LEHTINEN K. and HAIKALA L.K.

Abstract (from CDS):

We have studied the ratio of 13CO and C18O column densities to the extinction AJ of background field stars in the direction of three globules: B 133, B 335, L 466. Selected positions in the globules were observed in the 12CO(J=1-0) line and in J=1-0 and J=2-1 transitions of 13CO and C18O using the 15-m Swedish-ESO Submillimetre Telescope (SEST) in Chile. One of the clouds, L 466, was also mapped in the C18O(J=1-0) line. In addition to the N(13CO)/AJ and N(C18O)/AJ ratios also the ratios of N(13CO) and N(C18O) to AV and N(H2) are given. These ratios were found to vary from cloud to cloud so that they are larger in B 335 than in B 133 and L 466. These variations are thought to primarily arise from variations of the column density ratio of CO and its isotopes to H2. The alternative explanation in terms of the N(H2)/AJ ratio being larger in starforming regions (B 335) than in more quiescent regions lacking star formation (B 133 and L 466) appears less likely. We also discuss the evidence for N(CO)/AJ variations on the basis of previous observations in star forming and non-star forming dark clouds.

Abstract Copyright:

Journal keyword(s): ISM: general - ISM: abundances - ISM: molecules

VizieR on-line data: <Available at CDS (J/A+A/421/1087): table1.dat appena.dat>

Simbad objects: 16

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Number of rows : 16
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NAME [BM89] L1521B cor 04 24 12.7 +26 36 53           ~ 67 0
2 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3950 0
3 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1069 1
4 NAME Coalsack Nebula DNe 12 31 19 -63 44.6           ~ 248 0
5 IRAS 12340-7958 LP? 12 37 39.7408011816 -80 15 13.707391932   16.11 14.39 13.63 9.81 ~ 106 0
6 NAME Cha III MoC 12 37.8 -80 15           ~ 134 2
7 LDN 183 MoC 15 54 12.2 -02 49 42           ~ 726 1
8 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3359 1
9 LDN 57 DNe 17 22 38.2 -23 49 34           ~ 300 1
10 LDN 466 DNe 18 19 41.9 -06 04 40           ~ 19 0
11 NAME Corona Australis Cloud MoC 19 01 51 -36 58.9           ~ 440 0
12 LDN 531 DNe 19 06 10.0 -06 53 45           ~ 66 0
13 Barnard 135 DNe 19 07.5 -03 55           ~ 3 0
14 LDN 663 DNe 19 36 55 +07 34.4           ~ 600 0
15 LDN 977 DNe 21 39.0 +43 14           ~ 37 0
16 IC 5146 OpC 21 53 29 +47 14.8           ~ 426 2

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2022.07.04-13:28:56

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