2018A&A...614A..64B


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.18CEST02:17:54

2018A&A...614A..64B - Astronomy and Astrophysics, volume 614A, 64-64 (2018/6-1)

Magnetic fields at the onset of high-mass star formation.

BEUTHER H., SOLER J.D., VLEMMINGS W., LINZ H., HENNING T., KUIPER R., RAO R., SMITH R., SAKAI T., JOHNSTON K., WALSH A. and FENG S.

Abstract (from CDS):


Context. The importance of magnetic fields at the onset of star formation related to the early fragmentation and collapse processes is largely unexplored today.
Aims. We want to understand the magnetic field properties at the earliest evolutionary stages of high-mass star formation.
Methods. The Atacama Large Millimeter Array is used at 1.3 mm wavelength in full polarization mode to study the polarized emission, and, using this, the magnetic field morphologies and strengths of the high-mass starless region IRDC 18310-4.
Results. Polarized emission is clearly detected in four sub-cores of the region; in general it shows a smooth distribution, also along elongated cores. Estimating the magnetic field strength via the Davis-Chandrasekhar-Fermi method and following a structure function analysis, we find comparably large magnetic field strengths between ∼0.3-5.3 mG. Comparing the data to spectral line observations, the turbulent-to-magnetic energy ratio is low, indicating that turbulence does not significantly contribute to the stability of the gas clump. A mass-to-flux ratio around the critical value 1.0 - depending on column density - indicates that the region starts to collapse, which is consistent with the previous spectral line analysis of the region.
Conclusions. While this high-mass region is collapsing and thus at the verge of star formation, the high magnetic field values and the smooth spatial structure indicate that the magnetic field is important for the fragmentation and collapse process. This single case study can only be the starting point for larger sample studies of magnetic fields at the onset of star formation.

Abstract Copyright: © ESO 2018

Journal keyword(s): stars: formation - instrumentation: interferometers - magnetic fields - polarization - stars: individual: IRDC18310 - ISM: clouds

Simbad objects: 16

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Number of rows : 16

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 QSO B1730-130 QSO 17 33 02.70578476 -13 04 49.5481484   18 18.5 18.78   ~ 954 1
3 QSO B1741-038 QSO 17 43 58.85613396 -03 50 04.6166450     18.5 17.98   ~ 465 1
4 4C 09.57 BLL 17 51 32.81857318 +09 39 00.7284829   17.46 16.78 15.57   ~ 784 1
5 GRS G012.89 +00.49 HII 18 11 51.3 -17 31 29           ~ 143 0
6 [BLT2013] mm2 cor 18 33 39.277 -08 21 09.83           ~ 2 0
7 [BLT2013] mm3 cor 18 33 39.334 -08 21 16.71           ~ 2 0
8 NAME IRDC 18310-4 cor 18 33 39.42 -08 21 10.4           ~ 12 0
9 [BLT2013] mm1 cor 18 33 39.472 -08 21 09.96           ~ 2 0
10 [BLT2013] mm4 cor 18 33 40.013 -08 21 04.84           ~ 2 0
11 IRAS 18449-0115 cor 18 47 34.4947 -01 12 40.269           ~ 291 0
12 ICRF J191207.1-080421 QSO 19 12 07.1282109771 -08 04 21.886400446           ~ 11 0
13 W 51 SNR 19 23 50 +14 06.0           ~ 1119 1
14 NAME Cyg X FIR 33 Y*O 20 38 35.9 +42 37 22           B1.5 357 1
15 NAME Cepheus A SFR 22 56 17.9 +62 01 49           ~ 690 2
16 [WBN74] NGC 7538 IRS 1 Y*O 23 13 45.318 +61 28 11.69           ~ 359 3

    Equat.    Gal    SGal    Ecl

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2019.10.18-02:17:54

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