1999ApJ...526..819V

Query : 1999ApJ...526..819V

1999ApJ...526..819V - Astrophys. J., 526, 819-832 (1999/December-1)

Magnetism in interstellar nurseries at 760 microns.

VALLEE J.P. and BASTIEN P.

Abstract (from CDS):

The advent of telescopes operating in the extreme infrared (EIR=submillimeter wavelengths) located at dry sites on mountain tops now permits observations of high dust and gas density (n∼2x108 cm–3), small diameter (L∼0.06 pc; 12000 AU) clumps inside large interstellar nurseries. Using the James Clerk Maxwell Telescope (JCMT) at 760 µm (394 GHz) in the EIR, we present new total continuum maps and linear polarization observations of the dust emission and the associated magnetic field for 35 clumps within six interstellar nurseries (OMC, Orion B, NGC 6334, M0.25+0.01, W48, and S140) located within 8.5 kpc of the Sun. A principal result is that the mean clump gas density varies with mean clump size as <n≳<L>–1.5. In one-third of our cases, the magnetic field in clumps is nearly perpendicular to the ridge linking clumps (not random from clump to clump). The cloud elongation does not appear to have a preferred angle with respect to the Galactic plane; we rule out models with a cloud magnetic field aligned with the large-scale galactic magnetic field. We find that the clump gravitational energy~the clump nonthermal kinetic energy, in many simple resolved nonconfused clumps, while other energy components are much smaller (magnetic, thermal, external pressure).

Abstract Copyright: ∼

Journal keyword(s): ISM: Clouds - Polarization - Submillimeter

Nomenclature: Table 2: [VB99] OMC 1 AN (Nos N0-N7), [VB99] NGC 6334 aN (Nos a1-a3, f0-f2), [VB99] NGC 6334 awN (Nos fN1-fN2), [VB99] M0.25+0.01 AN (Nos P2-P5), [VB99] W48 AN (Nos P0, E1-E2, S1), <%M [VB99] S140 AN (Nos P1-P3).

CDS comments: p.827: IRAS 16293 = IRAS 16293-2422. Table 2: Source in OMC 2 = [MWZ90] OMC-2 FIR 4, Sources in Ori B = [MCK88] NGC 2024 FIR 3 to FIR 6, Sources in MFSW V (NGC 6334v) = [SDW85] IRS V-1 to V-3.

Simbad objects: 63

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Number of rows : 63
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 [JCC87] IRAS 4A Y*O 03 29 10.49 +31 13 30.8           ~ 770 1
2 [JCC87] IRAS 4 FIR 03 29 10.9 +31 13 26           ~ 489 0
3 [JCC87] IRAS 4B Y*O 03 29 12.058 +31 13 02.05           ~ 625 0
4 NAME OMC-1 MoC 05 35 14 -05 22.4           ~ 1249 2
5 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2421 1
6 [VB99] OMC 1 N0 smm 05 35 14.4 -05 22 33           ~ 1 0
7 [VB99] OMC 1 N7 smm 05 35 14.8 -05 18 46           ~ 1 0
8 [VB99] OMC 1 N4 smm 05 35 15.8 -05 20 09           ~ 1 0
9 [VB99] OMC 1 N3 smm 05 35 15.9 -05 20 41           ~ 1 0
10 [VB99] OMC 1 N1 smm 05 35 16.1 -05 21 14           ~ 1 0
11 [VB99] OMC 1 N2 smm 05 35 16.2 -05 20 56           ~ 1 0
12 [VB99] OMC 1 N5 smm 05 35 16.7 -05 19 24           ~ 1 0
13 [VB99] OMC 1 N6 smm 05 35 17.5 -05 19 13           ~ 1 0
14 V* V2457 Ori Or* 05 35 26.97000 -05 09 54.4644         18.858 ~ 166 0
15 NAME Flame Nebula HII 05 41 42.7 -01 54 44           ~ 715 1
16 NAME Ori B MoC 05 41 43.0 -01 54 44           ~ 1498 0
17 [MCK88] NGC 2024 FIR 3 Y*O 05 41 43.00 -01 54 24.0           ~ 52 0
18 NGC 2024 Cl* 05 41 43 -01 50.5           ~ 1198 1
19 [MCK88] NGC 2024 FIR 4 Y*O 05 41 44.00 -01 54 42.0           ~ 55 0
20 [MCK88] NGC 2024 FIR 5 cor 05 41 44.6 -01 55 38           ~ 98 0
21 [MCK88] NGC 2024 FIR 6 IR 05 41 45.00 -01 56 01.0           ~ 56 0
22 NAME Orion Molecular Cloud MoC 05 56 -01.8           ~ 1227 1
23 NAME Mon R2 HII 06 07 47.58 -06 22 42.6           ~ 789 2
24 IRAS 16293-2422 cor 16 32 22.56 -24 28 31.8           ~ 1357 1
25 [HTS2007] EN-A2 IR 17 18 17.16 -35 56 21.6           ~ 13 0
26 NAME NGC 6334 FIR V Cl* 17 19 57 -35 57.5           ~ 99 0
27 [HTS2007] EN-A1 IR 17 19 58.0 -35 58 00           ~ 17 0
28 [VB99] NGC 6334 a3 smm 17 20 17.8 -35 55 00           ~ 1 0
29 [VB99] NGC 6334 a2 smm 17 20 18.1 -35 54 47           ~ 1 0
30 [VB99] NGC 6334 a1 smm 17 20 19.2 -35 54 41           ~ 1 0
31 NGC 6334A HII 17 20 19.3 -35 54 55           ~ 123 0
32 [VB99] NGC 6334 f1 smm 17 20 52.4 -35 47 02           ~ 1 0
33 NGC 6334 HII 17 20 53 -36 07.9           ~ 740 0
34 [VB99] NGC 6334 f2 smm 17 20 52.7 -35 47 10           ~ 1 0
35 [VB99] NGC 6334 f0 smm 17 20 53.3 -35 47 01           ~ 1 0
36 NAME NGC 6334F (C) HII 17 20 53.45 -35 47 02.6           ~ 244 1
37 [VB99] NGC 6334 fn1 smm 17 20 55.0 -35 45 05           ~ 1 0
38 [VB99] NGC 6334 fn2 smm 17 20 55.3 -35 45 24           ~ 1 0
39 [VB99] M0.25+0.01 P2 smm 17 46 09.1 -28 42 09           ~ 1 0
40 NAME the Brick MoC 17 46 09 -28 43.8           ~ 226 0
41 [VB99] M0.25+0.01 P3 smm 17 46 10.3 -28 42 26           ~ 1 0
42 AGAL G000.259+00.017 smm 17 46 10.320 -28 42 32.31           ~ 14 0
43 [VB99] M0.25+0.01 P4 smm 17 46 10.7 -28 42 42           ~ 1 0
44 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 2443 1
45 AGAL G015.024-00.654 Y*O 18 20 19 -16 11.3           ~ 13 0
46 JCMTSF J182021.0-161237 Rad 18 20 21.3 -16 12 37           ~ 5 0
47 [VB96] P1 Rad 18 20 22.8 -16 11 22           ~ 2 0
48 [VB96] P3 Rad 18 20 22.9 -16 11 52           ~ 2 0
49 NAME M 17 SW SFR 18 20 23.1 -16 11 43           ~ 281 0
50 JCMTSE J182024.0-161319 smm 18 20 24 -16 13.3           ~ 4 0
51 [VB96] P6 Rad 18 20 25.4 -16 13 47           ~ 2 0
52 [KDJ99] NGC 6334V 3 IR 18 58 16.40 -35 52 44.6           ~ 10 0
53 SNR G035.2-01.8 SNR 19 01.6 +01 14           ~ 158 0
54 [VB99] W48 E2 smm 19 01 44.4 +01 13 28           ~ 1 0
55 [VB99] W48 E1 smm 19 01 45.4 +01 13 31           ~ 1 0
56 [VB99] W48 S1 smm 19 01 46.4 +01 13 17           ~ 1 0
57 [VB99] W48 P0 smm 19 01 46.4 +01 13 27           ~ 1 0
58 SH 2-140 OpC 22 19 07.8 +63 17 07           ~ 668 2
59 [MWW95] S140-SMM 1 smm 22 19 16.7 +63 18 42           ~ 15 0
60 IRAS 22176+6303 Y*O 22 19 18.23 +63 18 47.5           ~ 600 0
61 NAME SH 2-140 IRS 1 Y*O 22 19 18.277 +63 18 45.82           ~ 201 0
62 [MWW95] S140-SMM 2 smm 22 19 18.9 +63 18 59           ~ 11 0
63 [VB99] S140 P3 smm 22 19 19.6 +63 18 26           ~ 1 0

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