2001ApJ...559..307J

Query : 2001ApJ...559..307J

2001ApJ...559..307J - Astrophys. J., 559, 307-317 (2001/September-3)

Large area mapping at 850 microns. III. Analysis of the clump distribution in the Orion B molecular cloud.

JOHNSTONE D., FICH M., MITCHELL G.F. and MORIARTY-SCHIEVEN G.

Abstract (from CDS):

We present results from a survey of a 900 arcmin2 region of the Orion B molecular cloud, including NGC 2068, NGC 2071, and HH 24/25/26, at 850 µm using the Submillimeter Common-User Bolometer Array (SCUBA) on the James Clerk Maxwell Telescope. Following the techniques developed by Johnstone et al., we identify 75 independent objects and compute size, flux, and degree of central concentration. Comparison with isothermal, pressure-confined, self-gravitating Bonnor-Ebert spheres implies that the clumps have internal temperatures of 20-40 K and surface pressures 5.5<logP/k<6.5. The clump masses span 0.2-12.3 M☉ assuming typical dust temperatures and a dust emissivity κ850=0.01 cm2.g–1. The distribution of clump masses is well characterized by a power-law N(M)∝M–α with α=1.5-2.0 for M>1.0 M☉. Significant incompleteness makes determination of the slope at lower masses difficult. The two-point correlation function of the clump separations is measured revealing clustering on size scales r<1.5x105 AU with a radial power-law exponent γ=0.75.

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Journal keyword(s): Infrared: ISM: Continuum - ISM: Clouds - ISM: Individual: Alphanumeric: HH 25-26 - ISM: Individual: Alphanumeric: L1630 - ISM: individual (NGC 2068) - ISM: Individual: NGC Number: NGC 2071 - ISM: Individual: Name: Orion B - ISM: Molecules - ISM: Structure - Stars: Formation

VizieR on-line data: <Available at CDS (J/ApJ/559/307): table1.dat>

Nomenclature: Table 1: [JFM2001] SMM JHHMMmm+DDMMm N=75.

Simbad objects: 95

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Number of rows : 95
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 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4971 0
2 RAFGL 618 pA* 04 42 53.6242032600 +36 06 53.400902220   16.32   12.59   C-rich 1027 0
3 M 42 HII 05 35 16.8 -05 23 15           ~ 4411 0
4 NAME Ori A MoC 05 38 -07.1           ~ 3187 0
5 NGC 2023 RNe 05 41 37.9 -02 15 52           ~ 657 1
6 NAME Ori B MoC 05 41 43.0 -01 54 44           ~ 1498 0
7 NGC 2024 Cl* 05 41 43 -01 50.5           ~ 1198 1
8 LDN 1630 DNe 05 45.5 -00 59           ~ 392 0
9 2MASS J05460363-0014493 Y*O 05 46 03.63 -00 14 49.3           ~ 78 0
10 OriBsmm 61 smm 05 46 04.1 -00 12 18           ~ 3 0
11 IRAS 05435-0015 Y*O 05 46 04.775 -00 14 16.51           ~ 79 0
12 NAME HH 25-26 HH 05 46 04.90 -00 14 52.0           ~ 8 0
13 HH 26 HH 05 46 05.1 -00 14 17           ~ 100 1
14 JCMTSE J054605.7-000939 Y*O 05 46 05.970 -00 09 32.69           ~ 14 0
15 HH 25 HH 05 46 06 -00 13.4           ~ 74 0
16 [JFM2001] SMM J054606-00122 smm 05 46 06.2 -00 12 17           ~ 3 1
17 [JFM2001] SMM J054606+00011 smm 05 46 06.6 +00 01 07           ~ 1 0
18 LBS 2-23 PoC 05 46 07.5 -00 10 24           ~ 14 0
19 HOPS 401 Y*O 05 46 07.720 -00 12 21.27           ~ 28 0
20 NAME HH 25MMS Y*O 05 46 07.8 -00 13 41           ~ 59 0
21 HBC 502 TT* 05 46 07.8799942272 -00 11 56.887013256     14.5     K3 56 0
22 IRAS 05435-0011 Y*O 05 46 08.45544 -00 10 02.9568           ~ 91 0
23 HGBS J054608.3-001044 Y*O 05 46 08.8 -00 10 47           ~ 92 0
24 HH 24 HH 05 46 09 -00 10.2           ~ 163 1
25 [JFM2001] SMM J054609-00058 Y*? 05 46 09.4 -00 05 51           ~ 6 0
26 HGBS J054610.0-001218 Y*O 05 46 10.0 -00 11 17           ~ 26 0
27 HGBS J054612.3-000950 Y*? 05 46 12.5 -00 09 48           ~ 10 0
28 V* V1647 Ori Or* 05 46 13.1370578472 -00 06 04.885093296     18.1     M3.9 317 1
29 HGBS J054613.5-000523 Y*O 05 46 13.81 -00 05 26.7           ~ 8 0
30 HGBS J054616.1-000039 cor 05 46 16.41 -00 00 35.7           ~ 6 0
31 [JFM2001] SMM J054617+00028 smm 05 46 17.4 +00 02 49           ~ 1 0
32 OriBsmm 64 Y*? 05 46 23.1 -00 13 28           ~ 7 0
33 LBS 2-17 PoC 05 46 24.0 +00 00 05           ~ 15 0
34 HGBS J054624.2-000000 Y*? 05 46 24.3 -00 00 01           ~ 10 0
35 HGBS J054626.7+000107 Y*? 05 46 26.8 +00 01 11           ~ 10 0
36 HGBS J054627.8-000053 Y*O 05 46 27.9 -00 00 52           ~ 28 0
37 HGBS J054627.9-000141 Y*? 05 46 28.1 -00 01 40           ~ 13 0
38 HGBS J054628.2+001927 Y*O 05 46 28.40 +00 19 27.1           ~ 23 1
39 HGBS J054628.5+000425 cor 05 46 28.60 +00 04 24.2           ~ 6 0
40 HGBS J054628.7+002110 Y*? 05 46 29.20 +00 21 09.1           ~ 8 0
41 OriBsmm 16 smm 05 46 29.5 +00 20 11           ~ 2 0
42 2MASS J05463064-0002349 Y*O 05 46 30.645 -00 02 34.97           ~ 41 0
43 [MAW2001] LBS17-MM10 Y*? 05 46 32.3 -00 00 40           ~ 9 0
44 [JFM2001] SMM J054633+00273 smm 05 46 33.2 +00 27 22           ~ 1 0
45 HGBS J054633.3-000003 Y*O 05 46 33.5 -00 00 05           ~ 8 0
46 HGBS J054634.8+002432 cor 05 46 34.8 +00 24 37           ~ 5 0
47 HGBS J054635.1+000032 Y*? 05 46 35.5 +00 00 34           ~ 10 0
48 HGBS J054636.1+000547 Y*? 05 46 36.3 +00 05 49           ~ 9 0
49 2MASS J05463755+0000338 Y*O 05 46 37.551 +00 00 33.80           ~ 22 0
50 HGBS J054637.8+002704 cor 05 46 37.6 +00 26 58           ~ 6 0
51 HGBS J054640.3+000031 Y*? 05 46 39.1 +00 00 34           ~ 11 0
52 HGBS J054639.3+000110 Y*O 05 46 39.4 +00 01 11           ~ 11 0
53 HGBS J054639.7+000416 Y*O 05 46 39.58 +00 04 16.6           ~ 14 0
54 HGBS J054643.0+000047 Y*O 05 46 43.0 +00 00 47           ~ 11 0
55 HGBS J054642.7-000145 Y*? 05 46 43.41 -00 01 47.7           ~ 8 0
56 HGBS J054645.4+000716 Y*? 05 46 45.7 +00 07 18           ~ 7 0
57 M 78 RNe 05 46 45.8 +00 04 45   8.0       ~ 397 0
58 HGBS J054647.3+000026 Y*O 05 46 47.69 +00 00 25.3           ~ 15 0
59 HGBS J054648.6+000121 Y*O 05 46 48.21 +00 01 33.2           ~ 11 0
60 HGBS J054650.0+000203 Y*? 05 46 50.0 +00 02 06           ~ 13 0
61 HGBS J054651.8+000912 Y*? 05 46 51.40 +00 09 09.2           ~ 8 0
62 [JFM2001] SMM J054651+00000 smm 05 46 51.6 +00 00 01           ~ 1 0
63 OriBsmm 43 smm 05 46 54.1 -00 00 24           ~ 2 0
64 [JFM2001] SMM J054654+00230 smm 05 46 54.2 +00 23 01           ~ 1 0
65 [JFM2001] SMM J054654+00239 smm 05 46 54.2 +00 23 58           ~ 1 0
66 OriBsmm 6 smm 05 46 55.0 +00 23 33           ~ 2 0
67 HGBS J054657.2+002356 Y*O 05 46 57.2 +00 23 57           ~ 9 0
68 HGBS J054656.4+002005 cor 05 46 57.3 +00 20 15           ~ 4 0
69 HGBS J054658.1+002429 Y*? 05 46 57.8 +00 24 30           ~ 8 0
70 JCMTSF J054701.0+002620 Y*? 05 47 01.0 +00 26 19           ~ 9 0
71 2MASS J05470160+0017594 Y*O 05 47 01.605 +00 17 59.43           ~ 20 0
72 OriBsmm 17 smm 05 47 03.7 +00 20 05           ~ 2 0
73 LBS 2-8 PoC 05 47 04.1 +00 21 42           ~ 5 0
74 NAME NGC 2071 IR SFR 05 47 04.4 +00 21 49           ~ 75 0
75 HGBS J054704.6+001459 cor 05 47 04.6 +00 14 59           ~ 7 0
76 HGBS J054705.0+001703 Y*? 05 47 05.00 +00 17 00.1           ~ 9 0
77 HGBS J054704.8+002145 Y*O 05 47 05.00 +00 21 45.1           ~ 9 0
78 HGBS J054705.2+001324 Y*? 05 47 05.2 +00 13 21           ~ 10 0
79 HGBS J054706.5+001232 Y*? 05 47 06.6 +00 12 32           ~ 10 0
80 HGBS J054706.2+002242 Y*O 05 47 06.8 +00 22 38           ~ 5 0
81 OriBsmm 3 smm 05 47 08.8 +00 24 05           ~ 2 1
82 NGC 2071 RNe 05 47 10 +00 18.0           ~ 661 1
83 [JFM2001] SMM J054710+00234 smm 05 47 10.0 +00 23 25           ~ 1 1
84 OriBsmm 5 smm 05 47 10.4 +00 23 38           ~ 2 1
85 2MASS J05471062+0021149 Y*O 05 47 10.62744 +00 21 14.9616           ~ 29 0
86 HGBS J054710.4+001550 Y*? 05 47 10.80 +00 15 51.1           ~ 8 0
87 HGBS J054710.7+001322 Y*? 05 47 11.00 +00 13 24.2           ~ 9 0
88 [JFM2001] SMM J054711+00234 smm 05 47 11.8 +00 23 28           ~ 1 1
89 [JFM2001] SMM J054712+00156 Y*? 05 47 12.2 +00 15 37           ~ 7 0
90 OriBsmm 7 smm 05 47 12.2 +00 23 02           ~ 2 0
91 HGBS J054712.7+002223 cor 05 47 12.6 +00 22 23           ~ 8 0
92 HGBS J054715.3+001839 Y*O 05 47 15.3 +00 18 34           ~ 7 0
93 HGBS J054716.0+002123 Y*O 05 47 16.0 +00 21 24           ~ 17 0
94 [JFM2001] SMM J054717+00227 smm 05 47 17.0 +00 22 46           ~ 1 0
95 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3969 1

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