2005A&A...431..149H

Query : 2005A&A...431..149H

2005A&A...431..149H - Astronomy and Astrophysics, volume 431, 149-163 (2005/2-3)

Clumpy filaments of the Chamaeleon I cloud: C18O mapping with the SEST.

HAIKALA L.K., HARJU J., MATTILA K. and TORISEVA M.

Abstract (from CDS):

The Chamaeleon I dark cloud (Cha I) has been mapped in C18O (J=1-0) with an angular resolution of 1' using the SEST telescope. The large scale structures previously observed with lower spatial resolution in the cloud turn into a network of clumpy filaments. The automatic Clumpfind routine developed by Williams et al., (1994ApJ...428..693W) is used to identify individual clumps in a consistent way. Altogether 71 clumps were found and the total mass of these clumps is 230M☉. The dense ``cores'' detected with the NANTEN telescope (Mizuno et al., 1999PASJ...51..859M) and the very cold cores detected in the ISOPHOT serendipity survey (Toth et al., 2000A&A...364..769T) form parts of these filaments but decompose into numerous ``clumps''. The filaments are preferentially oriented at right angles to the large-scale magnetic field in the region. We discuss the cloud structure, the physical characteristics of the clumps and the distribution of young stars. The observed clump mass spectrum is compared with the predictions of the turbulent fragmentation model of Padoan & Nordlund (2002ApJ...576..870P). Agreement is found if fragmentation has been driven by very large-scale hypersonic turbulence, and if by now it has had time to dissipate into modestly supersonic turbulence in the interclump gas. According to numerical simulations, large-scale turbulence should have resulted in filamentary structures as seen in Cha I. The well-oriented magnetic field does not, however, support this picture, but suggests magnetically steered large-scale collapse. The origin of filaments and clumps in Cha I is thus controversial. A possible solution is that the characterization of the driving turbulence fails and that in fact different processes have been effective on small and large scales in this cloud.

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

Nomenclature: Fig.1, Table 1: [HHM2005] NN (Nos 1-71).

Simbad objects: 87

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Number of rows : 87
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 [HHM2005] 63 PoC 11 00 52.0 -78 00 35           ~ 1 0
2 [HHM2005] 58 PoC 11 00 53.3 -77 34 05           ~ 1 0
3 [HHM2005] 26 PoC 11 01 11.8 -77 30 23           ~ 1 0
4 [HHM2005] 53 PoC 11 01 11.9 -78 00 11           ~ 2 0
5 [HHM2005] 11 PoC 11 01 17.2 -77 46 52           ~ 1 0
6 [HHM2005] 32 PoC 11 01 30.6 -77 44 03           ~ 1 0
7 [HHM2005] 64 PoC 11 01 46.2 -78 02 48           ~ 1 0
8 [HHM2005] 9 PoC 11 02 07.4 -77 38 34           ~ 1 0
9 [HHM2005] 50 PoC 11 02 16.7 -77 54 18           ~ 1 0
10 [HHM2005] 13 PoC 11 02 18.0 -77 42 03           ~ 1 0
11 [HHM2005] 14 PoC 11 02 28.6 -77 32 44           ~ 1 0
12 [HHM2005] 24 PoC 11 02 29.7 -78 00 55           ~ 1 0
13 [HHM2005] 31 PoC 11 02 41.1 -77 48 10           ~ 1 0
14 [HHM2005] 69 PoC 11 02 51.2 -77 45 21           ~ 1 0
15 [HHM2005] 7 PoC 11 03 09.9 -77 38 44           ~ 2 0
16 [HHM2005] 15 PoC 11 03 17.7 -77 33 05           ~ 1 0
17 ISOSS J11035-7759 IR 11 03 30 -77 59.0           ~ 2 0
18 [HHM2005] 6 PoC 11 03 40.8 -77 49 04           ~ 2 0
19 ISOSS J11037-7748 IR 11 03 45 -77 48.5           ~ 2 0
20 [HHM2005] 54 PoC 11 03 48.1 -77 41 10           ~ 1 0
21 [HHM2005] 4 PoC 11 03 50.3 -77 36 24           ~ 2 0
22 [HHM2005] 16 PoC 11 04 09.1 -77 58 56           ~ 1 0
23 [HHM2005] 49 PoC 11 04 27.9 -77 42 41           ~ 1 0
24 ISOSS J11045-7738 IR 11 04 30 -77 04.5           ~ 2 0
25 [HHM2005] 29 PoC 11 04 38.7 -77 27 44           ~ 1 0
26 [HHM2005] 46 PoC 11 04 41.7 -77 49 14           ~ 1 0
27 [HHM2005] 71 PoC 11 04 52.7 -77 23 48           ~ 1 0
28 [HHM2005] 5 PoC 11 04 54.9 -77 46 08           ~ 2 0
29 [HHM2005] 37 PoC 11 05 04.0 -77 31 19           ~ 1 0
30 [HHM2005] 42 PoC 11 05 18.6 -77 37 08           ~ 1 0
31 [HHM2005] 41 PoC 11 05 28.6 -77 40 56           ~ 1 0
32 [HHM2005] 40 PoC 11 05 33.2 -77 55 02           ~ 1 0
33 [HHM2005] 48 PoC 11 05 37.0 -77 16 38           ~ 1 0
34 [HHM2005] 52 PoC 11 05 43.3 -77 46 36           ~ 1 0
35 [HHM2005] 28 PoC 11 05 50.8 -77 49 02           ~ 1 0
36 [HHM2005] 51 PoC 11 06 05.1 -77 18 58           ~ 1 0
37 Ass Cha T 2-21 TT* 11 06 15.3471261840 -77 21 56.720362608   12.58 11.01   9.35 G5Ve 131 0
38 [HHM2005] 21 PoC 11 06 26.9 -77 44 26           ~ 2 0
39 [HHM2005] 3 PoC 11 06 30.0 -77 24 18           ~ 1 0
40 [HHM2005] 45 PoC 11 06 32.8 -77 19 00           ~ 1 0
41 [PCW91] Ced 110 IRS 10 Y*O 11 06 33.38 -77 23 34.6           ~ 69 1
42 [HHM2005] 22 PoC 11 06 37.6 -77 34 30           ~ 1 0
43 [HHM2005] 30 PoC 11 06 42.1 -77 41 22           ~ 1 0
44 IRAS 11051-7706 Y*O 11 06 46.025 -77 22 29.67           ~ 87 0
45 [PMG2001] NIR 76 Y*? 11 06 46.580 -77 22 32.56           ~ 55 0
46 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1154 1
47 [HHM2005] 66 PoC 11 06 51.0 -77 16 17           ~ 1 0
48 [HHM2005] 56 PoC 11 06 54.3 -77 49 15           ~ 1 0
49 [HHM2005] 23 PoC 11 06 58.4 -77 38 41           ~ 1 0
50 [HHM2005] 39 PoC 11 07 17.6 -77 44 50           ~ 1 0
51 [HHM2005] 25 PoC 11 07 22.9 -77 31 31           ~ 1 0
52 [HHM2005] 65 PoC 11 07 27.9 -77 18 22           ~ 1 0
53 [HHM2005] 8 PoC 11 07 39.6 -77 20 09           ~ 2 0
54 [HHM2005] 59 PoC 11 08 02.3 -77 48 05           ~ 1 0
55 BRAN 341B RNe 11 08 03.4 -77 39 19           ~ 27 0
56 [HHM2005] 17 PoC 11 08 09.5 -77 20 46           ~ 1 0
57 [HHM2005] 27 PoC 11 08 28.9 -77 29 08           ~ 1 0
58 NAME Cha IR Nebula TT* 11 08 38.702 -77 43 51.54           M5.5 72 0
59 [HHM2005] 70 PoC 11 08 43.2 -76 31 35           ~ 1 0
60 [HHM2005] 38 PoC 11 08 49.0 -77 44 13           ~ 2 0
61 [HHM2005] 18 PoC 11 09 02.2 -77 25 10           ~ 1 0
62 Sz 30 TT* 11 09 11.72304 -77 29 12.4836   14.89 13.28 13.02 11.032 M2.5+M2 54 0
63 [HHM2005] 19 PoC 11 09 29.1 -77 18 32           ~ 1 0
64 [HHM2005] 2 PoC 11 09 34.5 -76 33 43           ~ 2 0
65 [HHM2005] 33 PoC 11 09 37.9 -77 21 59           ~ 1 0
66 [HHM2005] 36 PoC 11 09 45.2 -76 30 40           ~ 1 0
67 [HHM2005] 35 PoC 11 09 47.2 -77 11 19           ~ 2 0
68 Ced 112 RNe 11 09 52.4 -76 36 57           ~ 32 0
69 V* WW Cha Or* 11 10 00.0802739160 -76 34 57.963853416   14.74 14.10   10.95 ~ 154 0
70 [HHM2005] 20 PoC 11 10 00.2 -76 45 44           ~ 1 0
71 [HHM2005] 1 PoC 11 10 03.8 -76 36 18           ~ 2 0
72 [HHM2005] 10 PoC 11 10 10.7 -76 41 05           ~ 2 0
73 [HHM2005] 43 PoC 11 10 23.6 -77 28 35           ~ 1 0
74 [HHM2005] 34 PoC 11 10 32.6 -76 32 33           ~ 1 0
75 [HHM2005] 44 PoC 11 10 33.0 -77 23 57           ~ 1 0
76 [HHM2005] 62 PoC 11 10 35.9 -77 00 28           ~ 1 0
77 [HHM2005] 12 PoC 11 10 40.1 -76 52 31           ~ 2 0
78 [HHM2005] 60 PoC 11 10 42.5 -77 09 09           ~ 1 0
79 [HHM2005] 47 PoC 11 11 17.4 -77 25 40           ~ 1 0
80 [HHM2005] 67 PoC 11 11 21.6 -76 43 23           ~ 1 0
81 [HHM2005] 57 PoC 11 11 25.7 -77 31 51           ~ 1 0
82 [HHM2005] 55 PoC 11 11 27.2 -77 20 45           ~ 1 0
83 [HHM2005] 68 PoC 11 11 35.4 -76 49 07           ~ 1 0
84 [HHM2005] 61 PoC 11 11 46.7 -77 28 15           ~ 1 0
85 [MHT99] 4 MoC ~ ~           ~ 2 0
86 [MHT99] 3 MoC ~ ~           ~ 2 0
87 [MHT99] 5 MoC ~ ~           ~ 2 0

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