The JCMT BISTRO Survey: multiwavelength polarimetry of bright regions in NGC 2071 in the far-infrared/submillimetre range, with POL-2 and HAWC+ - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Monthly Notices of the Royal Astronomical Society Year : 2022

The JCMT BISTRO Survey: multiwavelength polarimetry of bright regions in NGC 2071 in the far-infrared/submillimetre range, with POL-2 and HAWC+

Lapo Fanciullo
  • Function : Author
Francisca Kemper
  • Function : Author
Kate Pattle
  • Function : Author
Patrick M. Koch
  • Function : Author
Sarah Sadavoy
  • Function : Author
Simon Coudé
  • Function : Author
Archana Soam
  • Function : Author
Thiem Hoang
  • Function : Author
Takashi Onaka
  • Function : Author
Valentin J. M. Le Gouellec
  • Function : Author
David Berry
  • Function : Author
Chakali Eswaraiah
  • Function : Author
Eun Jung Chung
  • Function : Author
Ray Furuya
  • Function : Author
Charles L. H. Hull
  • Function : Author
Jihye Hwang
  • Function : Author
Douglas Johnstone
  • Function : Author
Ji-Hyun Kang
  • Function : Author
Kyoung Hee Kim
  • Function : Author
Florian Kirchschlager
  • Function : Author
Vera Könyves
Jungmi Kwon
Woojin Kwon
  • Function : Author
Shih-Ping Lai
  • Function : Author
Chang Won Lee
  • Function : Author
Tie Liu
  • Function : Author
A. -Ran Lyo
  • Function : Author
Ian Stephens
  • Function : Author
Motohide Tamura
Xindi Tang
  • Function : Author
Derek Ward-Thompson
Anthony Whitworth
  • Function : Author
Hiroko Shinnaga

Abstract

Polarized dust emission is a key tracer in the study of interstellar medium and of star formation. The observed polarization, however, is a product of magnetic field structure, dust grain properties, and grain alignment efficiency, as well as their variations in the line of sight, making it difficult to interpret polarization unambiguously. The comparison of polarimetry at multiple wavelengths is a possible way of mitigating this problem. We use data from HAWC+ /SOFIA and from SCUBA-2/POL-2 (from the BISTRO survey) to analyse the NGC 2071 molecular cloud at 154, 214, and 850 $\mu$m. The polarization angle changes significantly with wavelength over part of NGC 2071, suggesting a change in magnetic field morphology on the line of sight as each wavelength best traces different dust populations. Other possible explanations are the existence of more than one polarization mechanism in the cloud or scattering from very large grains. The observed change of polarization fraction with wavelength, and the 214-to-154 $\mu$m polarization ratio in particular, are difficult to reproduce with current dust models under the assumption of uniform alignment efficiency. We also show that the standard procedure of using monochromatic intensity as a proxy for column density may produce spurious results at HAWC+wavelengths. Using both long-wavelength (POL-2, 850 $\mu$m) and short-wavelength (HAWC+, $\lesssim 200\, \mu$m) polarimetry is key in obtaining these results. This study clearly shows the importance of multi-wavelength polarimetry at submillimetre bands to understand the dust properties of molecular clouds and the relationship between magnetic field and star formation.
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Dates and versions

insu-03667426 , version 1 (12-04-2023)

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Lapo Fanciullo, Francisca Kemper, Kate Pattle, Patrick M. Koch, Sarah Sadavoy, et al.. The JCMT BISTRO Survey: multiwavelength polarimetry of bright regions in NGC 2071 in the far-infrared/submillimetre range, with POL-2 and HAWC+. Monthly Notices of the Royal Astronomical Society, 2022, 512, pp.1985-2002. ⟨10.1093/mnras/stac528⟩. ⟨insu-03667426⟩
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