The JCMT BISTRO Survey: Studying the Complex Magnetic Field of L43

Abstract

We present observations of polarized dust emission at 850 $\mu$m from the L43 molecular cloud which sits in the Ophiuchus cloud complex. The data were taken using SCUBA-2/POL-2 on the James Clerk Maxwell Telescope as a part of the BISTRO large program. L43 is a dense ($N_{{\mathrm{H}}_2}\sim 10^{22}$-10${}^{23}$ cm${}^{-2}$) complex molecular cloud with a submillimetre-bright starless core and two protostellar sources. There appears to be an evolutionary gradient along the isolated filament that L43 is embedded within, with the most evolved source closest to the Sco OB2 association. One of the protostars drives a CO outflow that has created a cavity to the southeast. We see a magnetic field that appears to be aligned with the cavity walls of the outflow, suggesting interaction with the outflow. We also find a magnetic field strength of up to $\sim$160$\pm$30 $\mu$G in the main starless core and up to $\sim$90$\pm$40 $\mu$G in the more diffuse, extended region. These field strengths give magnetically super- and sub-critical values respectively and both are found to be roughly trans-Alfvénic. We also present a new method of data reduction for these denser but fainter objects like starless cores.

arXiv commentAccepted for publication in ApJ. 23 pages, 9 figures (7 main text, 2 appendix)

References in corpus (51)

• Astropy: A Community Python Package for Astronomy
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• Estimating distances from parallaxes IV: Distances to 1.33 billion stars in Gaia Data Release 2
• Density, Velocity, and Magnetic Field Structure in Turbulent Molecular Cloud Models
• Dense Cores in Dark Clouds. XIV. N2H+(1-0) maps of dense cloud cores
• SCUBA-2: The 10000 pixel bolometer camera on the James Clerk Maxwell Telescope
• Radiative torques: Analytical Model and Basic Properties
• Planck intermediate results. XXXV. Probing the role of the magnetic field in the formation of structure in molecular clouds
• SCUBA-2: iterative map-making with the Sub-Millimetre User Reduction Facility
• The Evolution of Outflow-Envelope Interactions in Low-Mass Protostars
• Dispersion of Magnetic Fields in Molecular Clouds. I
• SCUBA-2: on-sky calibration using submillimetre standard sources
• The Millennium Arecibo 21-cm Absorption Line Survey. IV. Statistics of Magnetic Field, Column Density, and Turbulence
• An Imprint of Molecular Cloud Magnetization in the Morphology of the Dust Polarized Emission
• Inefficient star formation through turbulence, magnetic fields and feedback
• SCUBA Polarization Measurements of the Magnetic Field Strengths in the L183, L1544, and L43 Prestellar Cores
• First Observations of the Magnetic Field Geometry in Pre-stellar Cores
• The James Clerk Maxwell Telescope Legacy Survey of Nearby Star-forming Regions in the Gould Belt
• Reconstructing the density and temperature structure of prestellar cores from $Herschel$ data: A case study for B68 and L1689B
• Planck intermediate results. XXIX. All-sky dust modelling with Planck, IRAS, and WISE observations
• The JCMT Gould Belt Survey: First results from the SCUBA-2 observations of the Ophiuchus molecular cloud and a virial analysis of its prestellar core population
• The JCMT BISTRO Survey: The magnetic field strength in the Orion A filament
• First results from BISTRO -- a SCUBA-2 polarimeter survey of the Gould Belt
• The Herschel and JCMT Gould Belt Surveys: Constraining Dust Properties in the Perseus B1 Clump with PACS, SPIRE, and SCUBA-2
• ALMA observations of dust polarization and molecular line emission from the Class 0 protostellar source Serpens SMM1
• Modeling the Physical Structure of the Low Density Pre-protostellar Core Lynds 1498
• Spectrally resolved pure rotational lines of water in protoplanetary disks
• The Dust Emissivity Spectral Index in the Starless Core TMC-1C
• Dust polarized emission observations of NGC 6334; BISTRO reveals the details of the complex but organized magnetic field structure of the high-mass star-forming hub-filament network
• Magnetic fields towards Ophiuchus-B derived from SCUBA-2 polarization measurements
• A Decade of SCUBA-2: A Comprehensive Guide to Calibrating 450 $\mu$m and 850 $\mu$m Continuum Data at the JCMT
• JCMT BISTRO Survey observations of the Ophiuchus Molecular Cloud: Dust grain alignment properties inferred using a Ricean noise model
• The JCMT Gould Belt Survey: A Quantitative Comparison Between SCUBA-2 Data Reduction Methods
• The JCMT BISTRO Survey: The Magnetic Field In The Starless Core $\rho$ Ophiuchus C
• JCMT POL-2 and BISTRO Survey observations of magnetic fields in the L1689 molecular cloud
• Multi-Generational Star Formation in L1551
• Intrinsic polarisation of elongated porous dust grains
• Understanding the origin of the magnetic field morphology in the wide-binary protostellar system BHR 71
• Magnetic field properties in star formation: a review of their analysis methods and interpretation
• B-fields in Star-Forming Region Observations (BISTRO): Magnetic Fields in the Filamentary Structures of Serpens Main
• The JCMT BISTRO survey: alignment between outflows and magnetic fields in dense cores/clumps
• CO in Protostars (COPS): $Herschel$-SPIRE Spectroscopy of Embedded Protostars
• SCUBA Mapping of Spitzer c2d Small Clouds and Cores
• Molecular Cloud Cores with High Deuterium Fraction: Nobeyama Single-Pointing Survey
• The JCMT Gould Belt Survey: the effect of molecular contamination in SCUBA-2 observations of Orion A
• Star-forming filament models
• The JCMT BISTRO Survey: An 850/450$\mu$m Polarization Study of NGC 2071IR in OrionB
• The JCMT Gould Belt Survey: SCUBA-2 Data-Reduction Methods and Gaussian Source Recovery Analysis
• The Spitzer c2d Survey of Nearby Dense Cores VII: Chemistry and Dynamics in L43
• Magnetic fields in the Horsehead Nebula
• First BISTRO observations of the dark cloud Taurus L1495A-B10: the role of the magnetic field in the earliest stages of low-mass star formation

Cited by in corpus (3)

• Evolution of magnetized hub-filament systems: Comparing the observed properties of W3(OH), W3 Main, and S 106
• Dust destruction by the supernova remnant forward shock in a turbulent interstellar medium
• The role of radiative torques in the molecular cloud core L43