2009ApJ...704..891L

Query : 2009ApJ...704..891L

2009ApJ...704..891L - Astrophys. J., 704, 891-897 (2009/October-3)

Anchoring magnetic field in turbulent molecular clouds.

LI H.-B., DOWELL C.D., GOODMAN A., HILDEBRAND R. and NOVAK G.

Abstract (from CDS):

One of the key problems in star formation research is to determine the role of magnetic fields. Starting from the atomic intercloud medium which has density nH∼ 1/cm3, gas must accumulate from a volume several hundred pc across in order to form a typical molecular cloud. Star formation usually occurs in cloud cores, which have linear sizes below 1 pc and densities n H2> 105/cm3. With current technologies, it is hard to probe magnetic fields at scales lying between the accumulation length and the size of cloud cores, a range corresponds to many levels of turbulent eddy cascade, and many orders of magnitude of density amplification. For field directions detected from the two extremes, however, we show here that a significant correlation is found. Comparing this result with molecular cloud simulations, only the sub-Alfvénic cases result in field orientations consistent with our observations.

Abstract Copyright: ∼

Journal keyword(s): ISM: clouds - ISM: magnetic fields - polarization - stars: formation - turbulence

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 - 2024 		#notes
1 [JCC87] IRAS 4A Y*O 03 29 10.49 +31 13 30.8           ~ 715 1
2 [JCC87] IRAS 4 FIR 03 29 10.9 +31 13 26           ~ 478 0
3 NGC 1333 OpC 03 29 11.3 +31 18 36           ~ 1450 1
4 [JCC87] IRAS 4B Y*O 03 29 12.058 +31 13 02.05           ~ 600 0
5 NAME OMC-1 MoC 05 35 14 -05 22.4           ~ 1169 2
6 [MGR2000a] IRAS 00494+5617 P1 HII 05 35 14.4 -04 55 45           ~ 38 0
7 OMC 3 MoC 05 35 20.0 -05 01 00           ~ 273 1
8 OMC 2 MoC 05 35 27 -05 10.1           ~ 450 1
9 OMC 4 MoC 05 36 06 -05 35.7           ~ 71 0
10 NGC 2024 Cl* 05 41 43 -01 50.5           ~ 1154 1
11 LBS 2-10 PoC 05 46 45.1 +00 00 24           ~ 11 0
12 NGC 2071 RNe 05 47 10 +00 18.0           ~ 645 1
13 NAME Orion Molecular Cloud MoC 05 56 -01.8           ~ 1098 1
14 NAME Mon R2 HII 06 07 47.58 -06 22 42.6           ~ 742 2
15 GGD 12 HH 06 10 50.6 -06 11 50           ~ 59 1
16 NGC 2264 OpC 06 40 52.1 +09 52 37           ~ 1793 0
17 EM* LkHA 53 TT* 06 41 06.1986599352 +09 36 22.927167036 14.71 14.31 13.43 12.9 12.43 G3V 89 1
18 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3629 1
19 IRAS 16293-2422 cor 16 32 22.56 -24 28 31.8           ~ 1252 1
20 NAME NGC 6334 FIR V Cl* 17 19 57 -35 57.5           ~ 95 0
21 NGC 6334A HII 17 20 19.3 -35 54 55           ~ 121 0
22 NAME NGC 6334-I Cl* 17 20 53.35 -35 47 01.5           ~ 342 0
23 2MASS J18191220-2047297 Y*O 18 19 12.21 -20 47 29.7           B1 133 0
24 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1612 0
25 NAME Corona Australis Cloud MoC 19 01 51 -36 58.9           ~ 490 0
26 IRAS 20126+4104 Y*O 20 14 25.8816769656 +41 13 36.879427236           B2.5-B0.5 440 0
27 RAFGL 2591 Y*O 20 29 24.8230 +40 11 19.590           ~ 622 0
28 DR 21 SFR 20 39 01.6 +42 19 38           O4.5 1054 0
29 SH 2-140 OpC 22 19 07.8 +63 17 07           ~ 658 2
30 IRAS 22176+6303 Y*O 22 19 18.23 +63 18 47.5           ~ 595 0
31 NAME Cepheus A SFR 22 56 17.9 +62 01 49           ~ 738 2

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