2001ApJ...561..864L


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.17CET19:45:36

2001ApJ...561..864L - Astrophys. J., 561, 864-870 (2001/November-2)

Interferometric mapping of magnetic fields in star-forming regions. I. W51 e1/e2 molecular cores.

LAI S.-P., CRUTCHER R.M., GIRART J.M. and RAO R.

Abstract (from CDS):

We present the first interferometric polarization map of the W51 e1/e2 molecular cores, obtained with the Berkeley-Illinois-Maryland Association (BIMA) array at 1.3 mm wavelength, with approximately 3" resolution. The polarization angle varies smoothly across the double cores with an average position angle of 23°±5° for W51 e1 and 15°±7° for W51 e2. The inferred magnetic field direction is parallel to the minor axis of the double cores, which is consistent with the theoretical picture that clouds collapse along the field lines. However, the magnetic field may not determine the axis of angular momentum of these two cores, since the field directions of the two cores significantly differ from the previously measured directions of rotational axes. The polarization percentage decreases toward regions with high intensity, suggesting that the dust alignment efficiency decreases toward high-density regions. The field directions are highly ordered, and the small dispersion of the polarization angles implies that magnetic fields are strong (≳1 mG) and perhaps dominate turbulence in W51 e1/e2.

Abstract Copyright:

Journal keyword(s): ISM: Clouds - ISM: individual (W51) - ISM: Magnetic Fields - Polarization - Stars: Formation - Techniques: Interferometric

CDS comments: Calibrator 1751+096 = QSO J1751+096

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 - 2020
#notes
1 [JCC87] IRAS 4A Y*O 03 29 10.49 +31 13 30.8           ~ 576 1
2 [JCC87] IRAS 4 FIR 03 29 10.9 +31 13 26           ~ 462 0
3 [JCC87] IRAS 4B Y*O 03 29 12.058 +31 13 02.05           ~ 548 0
4 NAME OMC-1 MoC 05 35 14 -05 22.4           ~ 1000 2
5 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 1967 1
6 OMC 3 MoC 05 35 20.0 -05 01 00           ~ 215 1
7 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5275 1
8 3C 279 QSO 12 56 11.1664521013 -05 47 21.531840471   18.01 17.75 15.87   ~ 2661 2
9 LDN 1755 DNe 16 43.5 -21 58           ~ 35 0
10 4C 09.57 BLL 17 51 32.81857318 +09 39 00.7284829   17.46 16.78 15.57   ~ 798 1
11 [OMN2000] Region 3 PoC 19 23 29.3 +14 31 38           ~ 149 0
12 NAME W 51 IRS 1 PoC 19 23 41.9 +14 30 36           ~ 95 0
13 W 51e1 Rad 19 23 43.77 +14 30 25.9           ~ 113 0
14 W 51e3 Rad 19 23 43.841 +14 30 24.91           B0.5 13 0
15 W 51e2 Rad 19 23 43.90 +14 30 34.8           ~ 179 0
16 W 51e4 Rad 19 23 43.909 +14 30 29.71           B0.5 15 0
17 W 51e8 HII 19 23 44.2 +14 30 28           ~ 33 0
18 W 51 SNR 19 23 50 +14 06.0           ~ 1130 1

    Equat.    Gal    SGal    Ecl

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2020.02.17-19:45:36

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