2019A&A...631A.154R


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.28CET10:49:12

2019A&A...631A.154R - Astronomy and Astrophysics, volume 631A, 154-154 (2019/11-1)

Magnetic properties of the protostellar core IRAS 15398-3359.

REDAELLI E., ALVES F.O., SANTOS F.P. and CASELLI P.

Abstract (from CDS):


Context. Magnetic fields can significantly affect the star formation process. The theory of the magnetically driven collapse in a uniform field predicts that the contraction initially happens along the field lines. When the gravitational pull grows strong enough, the magnetic field lines pinch inwards, giving rise to a characteristic hourglass shape.
Aims. We investigate the magnetic field structure of a young Class 0 object, IRAS 15398-3359, embedded in the Lupus I cloud. Previous observations at large scales have suggested that this source evolved in an highly magnetised environment. This object thus appears to be an ideal candidate to study the magnetically driven core collapse in the low-mass regime.
Methods. We performed polarisation observations of IRAS 15398-3359 at 214 µm using the SOFIA telescope, thus tracing the linearly polarised thermal emission of cold dust.
Results. Our data unveil a significant bend of the magnetic field lines from the gravitational pull. The magnetic field appears ordered and aligned with the large-scale B-field of the cloud and with the outflow direction. We estimate a magnetic field strength of B=78µG, which is expected to be accurate within a factor of two. The measured mass-to-flux parameter is λ=0.95, indicating that the core is in a transcritical regime.

Abstract Copyright: © E. Redaelli et al. 2019

Journal keyword(s): ISM: clouds - ISM: magnetic fields - stars: protostars - stars: formation - techniques: polarimetric - ISM: individual objects: IRAS 15398-3359

VizieR on-line data: <Available at CDS (J/A+A/631/A154): list.dat fits/*>

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 - 2021
#notes
1 LDN 1448 DNe 03 22.5 +30 35           ~ 473 0
2 [JCC87] IRAS 4A Y*O 03 29 10.49 +31 13 30.8           ~ 617 1
3 Barnard 1 MoC 03 33 16.3 +31 07 51           ~ 269 0
4 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3618 0
5 NAME OMC-1 MoC 05 35 14 -05 22.4           ~ 1031 2
6 NAME Lupus I Cld 15 43 02.1 -34 09 06           ~ 234 0
7 IRAS 15398-3359 Y*? 15 43 02.21016 -34 09 07.7112       18.38 21.72 ~ 131 0
8 NAME Lup Cloud SFR 16 03 -38.1           ~ 545 0
9 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3115 1
10 NGC 7538 OpC 23 13 37 +61 30.0           ~ 833 0

    Equat.    Gal    SGal    Ecl

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2021.01.28-10:49:12

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