2014ApJ...794L..18Q


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.05CET18:23:09

2014ApJ...794L..18Q - Astrophys. J., 794, L18 (2014/October-2)

Submillimeter array observations of magnetic fields in G240.31+0.07: an hourglass in a massive cluster-forming core.

QIU K., ZHANG Q., MENTEN K.M., LIU H.B., TANG Y.-W. and GIRART J.M.

Abstract (from CDS):

We report the first detection of an hourglass magnetic field aligned with a well-defined outflow rotation system in a high-mass, star-forming region. The observations were performed with the Submillimeter Array toward G240.31+0.07, which harbors a massive, flattened, and fragmenting molecular cloud core and a wide-angle bipolar outflow. The polarized dust emission at 0.88 mm reveals a clear hourglass-shaped magnetic field aligned within 20° of the outflow axis. Maps of high-density tracing spectral lines, e.g., H13CO+ (4-3), show that the core is rotating about its minor axis, which is also aligned with the magnetic field axis. Therefore, both the magnetic field and kinematic properties observed in this region are surprisingly consistent with the theoretical predictions of the classic paradigm of isolated low-mass star formation. The strength of the magnetic field in the plane of sky is estimated to be ∼1.1 mG, resulting in a mass-to-magnetic flux ratio of 1.4 times the critical value and a turbulent-to-ordered magnetic energy ratio of 0.4. We also find that the specific angular momentum almost linearly decreases from r ∼ 0.6 pc to 0.03 pc scales, which is most likely attributed to magnetic braking.

Abstract Copyright:

Journal keyword(s): ISM: magnetic fields - stars: early-type - stars: formation - techniques: interferometric - techniques: polarimetric

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 3C 84 Sy2 03 19 48.1597607660 +41 30 42.114155434   13.10 12.48 11.09   ~ 3621 3
2 QSO J0730-116 QSO 07 30 19.11247420 -11 41 12.6005110     20.30 20.3   ~ 269 1
3 [QZW2009] MM3 mm 07 44 51.951 -24 07 43.75           ~ 4 0
4 [CSL2007] Clump B mm 07 44 51.973 -24 07 42.50           ~ 5 0
5 WISE J074451.99-240742.1 mul 07 44 51.997 -24 07 42.11           ~ 64 0
6 [CSL2007] Clump A smm 07 44 52.040 -24 07 42.20           ~ 5 0
7 3C 279 Bla 12 56 11.1664521013 -05 47 21.531840471   18.01 17.75 15.87   ~ 2752 2
8 IRAS 18449-0115 cor 18 47 34.4947 -01 12 40.269           ~ 323 0

    Equat.    Gal    SGal    Ecl

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2021.03.05-18:23:09

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