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titlePolarization of Mid-infrared Emission from Polycyclic Aromatic Hydrocarbons
Author(eng)Hoang, Thiem
Author Affiliation(eng)Korea Astronomy and Space Science Institute : Korea University of Science and technology
Issue Date2018-03-09
PublisherJapan Aerospace Exploration Agency (JAXA)
Publication titleJAXA Special Publication: The Cosmic Wheel and the Legacy of the AKARI archive: from galaxies and stars to planets and life
Start page103
End page106
Publication date2018-03-09
AbstractPolarized emission from polycyclic aromatic hydrocarbons (PAHs) is important for testing the basic physics of the alignment of ultrasmall grains and potentially offers a new way to trace magnetic fields. In this talk, a new model of polarized PAH emission is presented, taking into account the effect of PAH alignment with the magnetic field. The polarization level of PAH emission features, for the different phases of the ISM is discussed. We find that negatively charged smallest PAHs in the reflection nebula can be excited to slightly suprathermal rotation due to enhanced ion collisional excitation, which enhance the polarization level. The polarization level and polarization angle predicted by our new model are supported by the first detection of the polarization at 11.3 micrometers PAH feature from MWC 1080 nebula by Zhang et al. (2017). Thus, the mid-IR polarization would become a new probe for the magnetic fields from the surface layer of circumstellar disks.
DescriptionMeeting Information: The 4th AKARI International Conference: The Cosmic Wheel and the Legacy of the AKARI archive: from galaxies and stars to planets and life (October 17-20, 2017. The University of Tokyo), Bunkyo-ku, Tokyo, Japan
Physical characteristics: Original contains color illustrations
会議情報: 第4回「あかり」国際会議 (2017年10月17-20日. 東京大学), 文京区, 東京
形態: カラー図版あり
KeywordsISM; Polarization; infrared emission; polycyclic aromatic hydrocarbon
Document TypeConference Paper
JAXA Category特別資料
NASA Subject CategoryAstronomy
Report NoJAXA-SP-17-009E

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