2003ApJ...594..911P


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.23CEST13:21:12

2003ApJ...594..911P - Astrophys. J., 594, 911-918 (2003/September-2)

Magnetic field morphology of Orion IRc2 from 86 GHz SiO maser polarization images.

PLAMBECK R.L., WRIGHT M.C.H. and RAO R.

Abstract (from CDS):

In an attempt to probe the magnetic field morphology near the massive young star Orion IRc2, we mapped the linear polarization of its J=2-1 SiO masers, in both the v=0 and v=1 vibrational levels, with 0".5 resolution. The intense v=1 masers are confined to a narrow zone 40 AU from the star. Their polarization position angles vary significantly on timescales of years. For the v=1 masers the stimulated emission rate R is likely to exceed the Zeeman splitting gΩ caused by any plausible magnetic field; in this case, the maser polarization need not correlate with the field direction. The much weaker v=0 masers in the ground vibrational level lie 100-700 AU from IRc2, in what appears to be a flared disk. Their fractional polarizations are as high as 50%. The polarization position angles vary little across the line profile or the emission region and appear to be stable in time. The position angle (P.A.=80°) we measure for the J=2-1 masers differs by 70° from that measured for the J=1-0 SiO transition, possibly because of Faraday rotation in the foreground, Orion A, H II region. A rotation measure 3.3x104 rad/m2 is required to bring the J=2-1 and J=1-0 position angles into concordance. The intrinsic polarization position angle for both transitions is then 57°, parallel to the plane of the putative disk. The magnetic field probably threads the disk poloidally. There is little evidence for a pinched or twisted field near the star.

Abstract Copyright:

Journal keyword(s): Masers - Polarization - Stars: Formation - Stars: Individual: Constellation Name: Orion KL IRc2 - Stars: Magnetic Fields

Simbad objects: 10

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Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 W 3 MoC 02 27 04.10 +61 52 27.1           ~ 942 3
2 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 1940 1
3 [RLK73] IRc 2a Y*O 05 35 14.511 -05 22 30.40           ~ 112 0
4 [RLK73] IRc 2 IR 05 35 14.51548 -05 22 30.5943           ~ 559 1
5 M 42 HII 05 35 17.3 -05 23 28           ~ 3658 0
6 NAME Ori A MoC 05 38 -07.1           ~ 2611 0
7 NAME ORI MOL CLOUD MoC 05 56 -01.8           ~ 812 1
8 NAME Mon R2 HII 06 07 46.6 -06 22 59           ~ 633 2
9 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5242 1
10 3C 279 QSO 12 56 11.1664521013 -05 47 21.531840471   18.01 17.75 15.87   ~ 2634 2

    Equat.    Gal    SGal    Ecl

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2019.10.23-13:21:12

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