2006A&A...447..597K


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.24CET20:00:56

2006A&A...447..597K - Astronomy and Astrophysics, volume 447, 597-607 (2006/2-4)

The ratio of N(C18O) and AV in Chamaeleon I and III-B. Using 2MASS and SEST.

KAINULAINEN J., LEHTINEN K. and HARJU J.

Abstract (from CDS):

We investigate the relationship between the C18O column density and the visual extinction in Chamaeleon I and in a part of the Chamaeleon III molecular cloud. The C18O column densities, N(C18O), are calculated from J=1-0 rotational line data observed with the SEST telescope. The visual extinctions, AV, are derived using JHK photometry from the 2MASS survey and the NICER color excess technique. In contrast with the previous results of Hayakawa et al. (2001PASJ...53.1109H), we find that the average N(C18O)/AV ratios are similar in Cha I and Cha III, and lie close to values derived for other clouds, i.e. N(C18O)≃2x1014cm–2(AV-2). We find, however, clear deviations from this average relationship towards individual clumps. Larger than average N(C18O)/AV ratios can be found in clumps associated with the active star forming region in the northern part of Cha I. On the other hand, some regions in the relatively quiescent southern part of Cha I show smaller than average N(C18O)/AV ratios and also very shallow proportionality between N(C18O) and AV. The shallow proportionality suggests that C18O is heavily depleted in these regions. As the degree of depletion is proportional to the gas density, these regions probably contain very dense, cold cores, which do not stand out in CO mappings. A comparison with the dust temperature map derived from the ISO data shows that the most prominent of the potentially depleted cores indeed coincides with a dust temperature minimum. It seems therefore feasible to use N(C18O) and AV data together for identifying cold, dense cores in large scale mappings.

Abstract Copyright:

Journal keyword(s): ISM: clouds - ISM: molecules - ISM: individual objects: Chamaeleon I - ISM: individual objects: Chamaeleon III

Nomenclature: Table 1: [KLH2006] N (Nos 1-4).

Simbad objects: 31

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Number of rows : 31

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3637 0
2 [HHM2005] 53 PoC 11 01 11.9 -78 00 11           ~ 2 0
3 [HHM2005] 7 PoC 11 03 09.9 -77 38 44           ~ 2 0
4 [HHM2005] 6 PoC 11 03 40.8 -77 49 04           ~ 2 0
5 [HHM2005] 4 PoC 11 03 50.3 -77 36 24           ~ 2 0
6 2MASS J11045075-7651200 * 11 04 50.76 -76 51 20.0           ~ 1 0
7 [HHM2005] 5 PoC 11 04 54.9 -77 46 08           ~ 2 0
8 2MASS J11045959-7735583 * 11 04 59.59 -77 35 58.3           ~ 1 0
9 Ass Cha T 2-21 TT* 11 06 15.3485848381 -77 21 56.737939872   12.58 11.01   9.35 G5Ve 125 0
10 [HHM2005] 21 PoC 11 06 26.9 -77 44 26           ~ 2 0
11 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1009 1
12 2MASS J11071925-7654191 * 11 07 19.2135961034 -76 54 19.089383630           ~ 1 0
13 [HHM2005] 8 PoC 11 07 39.6 -77 20 09           ~ 2 0
14 [HHM2005] 38 PoC 11 08 49.0 -77 44 13           ~ 2 0
15 [HHM2005] 2 PoC 11 09 34.5 -76 33 43           ~ 2 0
16 [HHM2005] 35 PoC 11 09 47.2 -77 11 19           ~ 2 0
17 Ced 112 RNe 11 09 52.4 -76 36 57           ~ 31 0
18 [HHM2005] 1 PoC 11 10 03.8 -76 36 18           ~ 2 0
19 [HHM2005] 10 PoC 11 10 10.7 -76 41 05           ~ 2 0
20 [HHM2005] 12 PoC 11 10 40.1 -76 52 31           ~ 2 0
21 2MASS J11105752-7744444 * 11 10 57.5554025488 -77 44 44.448687473           ~ 1 0
22 NAME Chamaeleon Region SFR 11 55 -78.0           ~ 708 0
23 NAME Coalsack Nebula DNe 12 31 19 -63 44.6           ~ 246 0
24 IRAS 12340-7958 * 12 37 39.7466355997 -80 15 13.713429632   16.11 14.39 13.63 9.81 ~ 101 0
25 NAME Cha III MoC 12 37.8 -80 15           ~ 131 2
26 * rho Oph ** 16 25 35.11766 -23 26 49.8150 4.30 4.85 4.63 4.27 3.96 B2IV+B2V 617 0
27 V* R CrA Ae* 19 01 53.6850227874 -36 57 08.145519972 12.781 12.651 11.917 11.242 10.412 B5IIIpe 456 1
28 [GLC2002] Cha III-B b PoC ~ ~           ~ 1 0
29 [GLC2002] Cha III-B PoC ~ ~           ~ 1 0
30 [GLC2002] Cha III-B n PoC ~ ~           ~ 1 0
31 [GLC2002] Cha III-B q PoC ~ ~           ~ 1 0

    Equat.    Gal    SGal    Ecl

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