University of Hertfordshire

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From the same journal

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  • 907159

    Accepted author manuscript, 1.05 MB, PDF document

  • Jungmi Kwon
  • Motohide Tamura
  • J. Hough
  • Nobuhiko Kusakabe
  • Tetsuya Nagata
  • Yasushi Nakajima
  • P.W. Lucas
  • Takahiro Nagayama
  • Ryo Kandori
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Original languageEnglish
Article numberL16
Number of pages7
JournalAstrophysical Journal Letters
Volume795
Issue1
Early online date16 Oct 2014
DOIs
Publication statusPublished - 1 Nov 2014

Abstract

We have conducted a systematic near-infrared circular polarization (CP) survey in star-forming regions, covering high-mass, intermediate-mass, and low-mass young stellar objects. All the observations were made using the SIRPOL imaging polarimeter on the Infrared Survey Facility 1.4 m telescope at the South African Astronomical Observatory. We present the polarization properties of 10 sub-regions in 6 star-forming regions. The polarization patterns, extents, and maximum degrees of linear and circular polarizations are used to determine the prevalence and origin of CP in the star-forming regions. Our results show that the CP pattern is quadrupolar in general, the CP regions are extensive, up to 0.65 pc, the CP degrees are high, up to 20%, and the CP degrees decrease systematically from high- to low-mass young stellar objects. The results are consistent with dichroic extinction mechanisms generating the high degrees of CP in star-forming regions.

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ID: 9203668