TY - JOUR
T1 - Mid-infrared Polarization of the Diffuse Interstellar Medium toward CygOB2-12
AU - Telesco, Charles M.
AU - Varosi, Frank
AU - Wright, Christopher
AU - Draine, Bruce T.
AU - Fernández Acosta, Sergio José
AU - Packham, Christopher
N1 - Publisher Copyright:
© 2022. The Author(s). Published by the American Astronomical Society.
PY - 2022/11/1
Y1 - 2022/11/1
N2 - We present the first mid-IR detection of the linear polarization toward the star CygOB2-12, a luminous blue hypergiant that, with A V ≈ 10 mag of foreground extinction, is a benchmark in the study of the properties of dust in the diffuse interstellar medium. The 8-13 μm spectropolarimetry, obtained with the CanariCam multimode camera at the Gran Telescopio CANARIAS shows clear trends with wavelength characteristic of silicate grains aligned in the interstellar magnetic field. The maximum polarization, detected with 7.8σ statistical significance near 10.2 μm, is (1.24 ± 0.28)% with position angle 126° ± 8°. We comment on these measurements in the context of recent models for the dust composition in the diffuse interstellar medium.
AB - We present the first mid-IR detection of the linear polarization toward the star CygOB2-12, a luminous blue hypergiant that, with A V ≈ 10 mag of foreground extinction, is a benchmark in the study of the properties of dust in the diffuse interstellar medium. The 8-13 μm spectropolarimetry, obtained with the CanariCam multimode camera at the Gran Telescopio CANARIAS shows clear trends with wavelength characteristic of silicate grains aligned in the interstellar magnetic field. The maximum polarization, detected with 7.8σ statistical significance near 10.2 μm, is (1.24 ± 0.28)% with position angle 126° ± 8°. We comment on these measurements in the context of recent models for the dust composition in the diffuse interstellar medium.
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U2 - 10.3847/2041-8213/ac9b56
DO - 10.3847/2041-8213/ac9b56
M3 - Article
AN - SCOPUS:85143052419
SN - 2041-8205
VL - 940
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
IS - 1
M1 - L26
ER -