@article{ca680a2a36604e49aa92fa4c5ce2efa5,
title = "The Magnetic Field in the Milky Way Filamentary Bone G47",
abstract = "Star formation primarily occurs in filaments where magnetic fields are expected to be dynamically important. The largest and densest filaments trace the spiral structure within galaxies. Over a dozen of these dense (∼104 cm-3) and long (>10 pc) filaments have been found within the Milky Way, and they are often referred to as {"}bones.{"}Until now, none of these bones has had its magnetic field resolved and mapped in its entirety. We introduce the SOFIA legacy project FIELDMAPS which has begun mapping ∼10 of these Milky Way bones using the HAWC+ instrument at 214 μm and 18.″2 resolution. Here we present a first result from this survey on the ∼60 pc long bone G47. Contrary to some studies of dense filaments in the Galactic plane, we find that the magnetic field is often not perpendicular to the spine (i.e., the center line of the bone). Fields tend to be perpendicular in the densest areas of active star formation and more parallel or random in other areas. The average field is neither parallel nor perpendicular to the Galactic plane or the bone. The magnetic field strengths along the spine typically vary from ∼20 to ∼100 μG. Magnetic fields tend to be strong enough to suppress collapse along much of the bone, but for areas that are most active in star formation, the fields are notably less able to resist gravitational collapse.",
keywords = "Dense interstellar clouds, Dust continuum emission, Interstellar dust, Interstellar filaments, Interstellar magnetic fields, Polarimetry, Protostars, Star formation, Young stellar objects",
author = "Stephens, {Ian W.} and Myers, {Philip C.} and Catherine Zucker and Jackson, {James M.} and Andersson, {B. G.} and Rowan Smith and Archana Soam and Cara Battersby and Patricio Sanhueza and Taylor Hogge and Smith, {Howard A.} and Giles Novak and Sarah Sadavoy and Pillai, {Thushara G.S.} and Li, {Zhi Yun} and Looney, {Leslie W.} and Koji Sugitani and Simon Coud{\'e} and Andr{\'e}s Guzm{\'a}n and Alyssa Goodman and Takayoshi Kusune and Santos, {F{\'a}bio P.} and Leah Zuckerman and Frankie Encalada",
note = "Funding Information: Based on observations made with the NASA/DLR Stratospheric Observatory for Infrared Astronomy (SOFIA). SOFIA is jointly operated by the Universities Space Research Association, Inc. (USRA), under NASA contract NNA17BF53C, and the Deutsches SOFIA Institut (DSI) under DLR contract 50 OK 0901 to the University of Stuttgart. Financial support for this work was provided by NASA through award #08_0186 issued by USRA. C.Z. acknowledges that support for this work was provided by NASA through the NASA Hubble Fellowship grant #HST-HF2-51498.001 awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS5-26555. R.J.S. acknowledges funding from an STFC ERF (grant ST/N00485X/1) C.B. gratefully acknowledges support from the National Science Foundation under Award Nos. 1816715 and 2108938. P.S. was partially supported by a Grant-in-Aid for Scientific Research (KAKENHI Number 18H01259) of the Japan Society for the Promotion of Science (JSPS). TGSP gratefully acknowledges support by the NSF under grant No. AST-2009842 and AST-2108989. Z.Y.L. is supported in part by NASA 80NSSC18K1095 and NSF AST-1815784. L.W.L. acknowledges support from NSF AST-1910364. We thank Michael Gordon for his effort in setting up the on-the-fly maps for the FIELDMAPS project and Sachin Shenoy for his work on the data reduction. We thank Miaomiao Zhang for sharing the locations of the YSOs for G47 based on Zhang et al. (). We thank Jin-Long Xu for providing us with Purple Mountain Observatory spectral data from Xu et al. () even though we did not use these data for this Letter. Publisher Copyright: {\textcopyright} 2022. The Author(s). Published by the American Astronomical Society.",
year = "2022",
month = feb,
day = "1",
doi = "10.3847/2041-8213/ac4d8f",
language = "English (US)",
volume = "926",
journal = "Astrophysical Journal Letters",
issn = "2041-8205",
publisher = "IOP Publishing Ltd.",
number = "1",
}