2009MNRAS.399.1681T

Query : 2009MNRAS.399.1681T

2009MNRAS.399.1681T - Mon. Not. R. Astron. Soc., 399, 1681-1693 (2009/November-2)

Statistical assessment of shapes and magnetic field orientations in molecular clouds through polarization observations.

TASSIS K., DOWELL C.D., HILDEBRAND R.H., KIRBY L. and VAILLANCOURT J.E.

Abstract (from CDS):

We present a novel statistical analysis aimed at deriving the intrinsic shapes and magnetic field orientations of molecular clouds using dust emission and polarization observations by the Hertz polarimeter. Our observables are the aspect ratio of the projected plane-of-the-sky cloud image and the angle between the mean direction of the plane-of-the-sky component of the magnetic field and the short axis of the cloud image. To overcome projection effects due to the unknown orientation of the line-of-sight, we combine observations from 24 clouds, assuming that line-of-sight orientations are random and all are equally probable. Through a weighted least-squares analysis, we find that the best-fitting intrinsic cloud shape describing our sample is an oblate disc with only small degrees of triaxiality. The best-fitting intrinsic magnetic field orientation is close to the direction of the shortest cloud axis, with small (∼24°) deviations towards the long/middle cloud axes. However, due to the small number of observed clouds, the power of our analysis to reject alternative configurations is limited.

Abstract Copyright: © 2009 California Institute of Technology. US government sponsorship acknowledged. Journal compilation © 2009 RAS

Journal keyword(s): magnetic fields - methods: statistical - techniques: polarimetric - ISM: clouds

Simbad objects: 33

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Number of rows : 33
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 W 3 MoC 02 27 04.10 +61 52 27.1           ~ 1064 3
2 NGC 1333 OpC 03 29 09.2 +31 20 59           ~ 1575 1
3 NAME OMC-1 MoC 05 35 14 -05 22.4           ~ 1249 2
4 [MGR2000a] IRAS 00494+5617 P1 HII 05 35 14.4 -04 55 45           ~ 39 0
5 OMC 3 MoC 05 35 20.0 -05 01 00           ~ 301 1
6 HOPS 87 Y*O 05 35 23.500 -05 01 29.58           ~ 123 0
7 [TSO2008] 18 mm 05 35 26.0 -05 05 42           ~ 47 1
8 OMC 2 MoC 05 35 27 -05 10.1           ~ 475 1
9 OMC 4 MoC 05 36 06 -05 35.7           ~ 80 0
10 NGC 2024 Cl* 05 41 43 -01 50.5           ~ 1198 1
11 LBS 2-17 PoC 05 46 24.0 +00 00 05           ~ 15 0
12 LBS 2-10 PoC 05 46 45.1 +00 00 24           ~ 11 0
13 NGC 2071 RNe 05 47 10 +00 18.0           ~ 661 1
14 NAME Mon R2 HII 06 07 47.58 -06 22 42.6           ~ 789 2
15 GGD 12 HH 06 10 50.6 -06 11 50           ~ 59 1
16 LBN 196.49-01.60 HII 06 14 38.29 +13 49 41.0           ~ 169 1
17 RAFGL 961 Y*O 06 34 37.74144 +04 12 44.1972           O-rich 242 1
18 NGC 2264 OpC 06 40 53.7 +09 52 32           ~ 1876 0
19 IRAS 06382+0939 Y*O 06 41 02.81160 +09 36 16.1712         19.89 ~ 93 0
20 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3969 1
21 IRAS 16293-2422 cor 16 32 22.56 -24 28 31.8           ~ 1357 1
22 NAME NGC 6334 FIR V Cl* 17 19 57 -35 57.5           ~ 99 0
23 NGC 6334A HII 17 20 19.3 -35 54 55           ~ 123 0
24 NAME NGC 6334-I Cl* 17 20 53.35 -35 47 01.5           ~ 373 0
25 W 33c Rad 18 13 59.0 -17 57 38           ~ 14 0
26 W 33a Y*O 18 14 39.56547 -17 52 02.2260           ~ 746 0
27 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1700 0
28 AGAL G030.818-00.056 cor 18 47 47.0 -01 54 28           ~ 186 0
29 RAFGL 2271 SFR 18 53 18.54 +01 14 57.9           ~ 537 0
30 W 49a SFR 19 10 15.7 +09 06 05           ~ 325 2
31 W 51a HII 19 23 29.3 +14 31 38           ~ 186 0
32 NAME Cyg X FIR 33 Y*O 20 38 35.9 +42 37 22           B1.5 423 1
33 DR 21 SFR 20 39 01.6 +42 19 38           O4.5 1121 0

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