2017ApJ...834..201L


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.14CEST12:50:10

2017ApJ...834..201L - Astrophys. J., 834, 201-201 (2017/January-2)

Synthetic observations of magnetic fields in protostellar cores.

LEE J.W.Y., HULL C.L.H. and OFFNER S.S.R.

Abstract (from CDS):

The role of magnetic fields in the early stages of star formation is not well constrained. In order to discriminate between different star formation models, we analyze 3D magnetohydrodynamic simulations of low-mass cores and explore the correlation between magnetic field orientation and outflow orientation over time. We produce synthetic observations of dust polarization at resolutions comparable to millimeter-wave dust polarization maps observed by the Combined Array for Research in Millimeter-wave Astronomy and compare these with 2D visualizations of projected magnetic field and column density. Cumulative distribution functions of the projected angle between the magnetic field and outflow show different degrees of alignment in simulations with differing mass-to-flux ratios. The distribution function for the less magnetized core agrees with observations finding random alignment between outflow and field orientations, while the more magnetized core exhibits stronger alignment. We find that fractional polarization increases when the system is viewed such that the magnetic field is close to the plane of the sky, and the values of fractional polarization are consistent with observational measurements. The simulation outflow, which reflects the underlying angular momentum of the accreted gas, changes direction significantly over over the first ∼0.1 Myr of evolution. This movement could lead to the observed random alignment between outflows and the magnetic fields in protostellar cores.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): ISM: jets and outflows - ISM: magnetic fields - magnetohydrodynamics MHD - polarization - stars: formation - stars: protostars - stars: protostars

Simbad objects: 6

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Number of rows : 6

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 [JCC87] IRAS 4A Y*O 03 29 10.49 +31 13 30.8           ~ 626 1
2 NAME Musca Cld 12 23 -71.3           ~ 168 0
3 NAME Lupus I Cld 15 43 02.1 -34 09 06           ~ 238 0
4 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3156 1
5 NAME the Pipe Nebula DNe 17 30 -25.0           ~ 351 1
6 LDN 1157 DNe 20 39 06.4 +68 02 13           ~ 504 0

    Equat.    Gal    SGal    Ecl

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2021.04.14-12:50:10

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