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

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Karoly, Janik 
Ward-Thompson, Derek 
Pattle, Kate 
Berry, David 
Whitworth, Anthony 


jats:titleAbstract</jats:title> jats:pWe present observations of polarized dust emission at 850 jats:italicμ</jats:italic>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 (jats:inline-formula jats:tex-math

</jats:tex-math> <mml:math xmlns:mml="" overflow="scroll"> mml:msub mml:mrow mml:miN</mml:mi> </mml:mrow> mml:mrow mml:msub mml:mrow <mml:mi mathvariant="normal">H</mml:mi> </mml:mrow> mml:mrow mml:mn2</mml:mn> </mml:mrow> </mml:msub> </mml:mrow> </mml:msub> mml:mo∼</mml:mo> mml:msup mml:mrow mml:mn10</mml:mn> </mml:mrow> mml:mrow mml:mn22</mml:mn> </mml:mrow> </mml:msup> </mml:math> <jats:inline-graphic xmlns:xlink="" xlink:href="apjacd6f2ieqn1.gif" xlink:type="simple" /> </jats:inline-formula>–10jats:sup23</jats:sup> cmjats:sup−2</jats:sup>) complex molecular cloud with a submillimeter-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 ∼160 ± 30 jats:italicμ</jats:italic>G in the main starless core and up to ∼90 ± 40 jats:italicμ</jats:italic>G in the more diffuse, extended region. These field strengths give magnetically super- and subcritical 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.</jats:p>



5101 Astronomical Sciences, 51 Physical Sciences

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American Astronomical Society
UKRI ∣ Science and Technology Facilities Council (STFC) (ST\R000786\1.)
Royal Society (The Royal Society) (URF\R1\211322)
National Research Foundation of Korea (NRF) (NRF-2019R1A2C1010851)
National Astronomical Observatory of Japan (NAOJ) (KG18K13586, KG20K14527 and KG22H01271)
Ministry of Science and Technology, Taiwan (MOST) (111-2811-M-005 -007, 109-2112-M-005 -003 -MY3)
MEXT ∣ Japan Society for the Promotion of Science (JSPS) (18H05442, 15H02063 and 22000005)
MEXT ∣ Japan Society for the Promotion of Science (JSPS) (19K14775)
MEC ∣ Agencia Estatal de Investigación (AEI) (PID2019-105552RB-C43)
DST ∣ Science and Engineering Research Board (SERB) (RJF/2020/000071)
MOST ∣ National Key Research and Development Program of China (NKPs) (2017YFA0402700)