1999MNRAS.304..406I

Query : 1999MNRAS.304..406I

1999MNRAS.304..406I - Mon. Not. R. Astron. Soc., 304, 406-414 (1999/April-1)

The magnetic field structure of the DR 21 region.

ITOH Y., CHRYSOSTOMOU A., BURTON M., HOUGH J.H. and TAMURA M.

Abstract (from CDS):

We present results of imaging polarimetry of the H2 v=1–0 S(1) line towards the outflow lobes of DR21. The polarization vectors are produced by dichroic absorption in a medium of aligned grains and therefore delineate the direction of the magnetic field, projected on to the plane of the sky, aligning those grains. It is argued that the polarization is dominated by grains within the DR21 cloud. The magnetic field strength, estimated from the dispersion of position angles of the polarization vectors, is ∼ 0.07 mG, which is not sufficient to play a significant role in either halting the outflow or confining its lateral expansion.

The polarimetry of the H2 v=1–0 S(1) line suggests that the magnetic field is parallel to the outflow axis for the eastern outflow lobe, whereas it appears twisted perpendicular to this axis for the western lobe. This peculiar morphology for the magnetic field may imply the presence of either a two-component magnetic field along the line of sight or a complex, wound-up magnetic field.


Abstract Copyright: 1999, Royal Astronomical Society

Journal keyword(s): magnetic fields - polarization - techniques: polarimetric - stars: pre-main-sequence - ISM: individual: DR21 - infrared: stars

Nomenclature: Fig.1: [DS96] O3 added. Table 2: [ICB99] WN (Nos E1-E5, W1-W5).

Simbad objects: 18

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Number of rows : 18
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 OMC-1 MoC 05 35 14 -05 22.4           ~ 1249 2
2 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3969 1
3 NAME Northern Coalsack DNe 20 21 +37.0           ~ 124 0
4 NAME Cyg X Cld 20 30 04.7973633 +40 51 36.002197           ~ 962 1
5 Schulte 12 s*b 20 32 40.9572199728 +41 14 29.279036940 16.1 14.45 11.702     B3-4Ia+ 453 0
6 [DS96] Knot Z PoC 20 37 04.8 +42 08 07           ~ 1 0
7 [DS96] Knot X PoC 20 37 06.7 +42 08 16           ~ 1 0
8 [DS96] Knot W PoC 20 37 07.3 +42 08 38           ~ 2 0
9 [DS96] Knot S PoC 20 37 07.7 +42 08 30           ~ 1 0
10 [DS96] Knot R PoC 20 37 07.9 +42 08 37           ~ 1 0
11 [ICB99] E3 PoC 20 37 20.1 +42 09 26           ~ 1 0
12 [DS96] Knot G PoC 20 37 20.9 +42 09 21           ~ 1 0
13 [DS96] Knot E PoC 20 37 21.0 +42 09 25           ~ 1 0
14 [DS96] Knot D PoC 20 37 21.4 +42 09 20           ~ 1 0
15 [ICB99] E1 PoC 20 37 21.8 +42 09 22           ~ 1 0
16 [DS96] I1 IR 20 39 00.0 +42 19 38           ~ 2 0
17 DR 21 SFR 20 39 01.6 +42 19 38           O4.5 1121 0
18 [DS96] O3 * 20 39 05.8525611624 +42 20 32.978107968           ~ 1 0

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