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 - Funding Information:
Based on observations made with the Gran Telescopio Canarias (GTC), installed at the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de CANARIAS, on the island of La Palma. We acknowledge the outstanding support of the GTC science and engineering staff who made these observations possible. This research was supported in part by the National Science Foundation under grants AST-1515331 and AST-1908625 to C.M.T. and AST-1908123 to B.T.D. C.M.W. acknowledges financial support during the period 2012–2017 from an Australian Research Council Future Fellowship FT100100495. The upgrade of CanariCam was cofinanced by the European Regional Development Fund (ERDF), within the framework of the “Programa Operativo de Crecimiento Inteligente 2014-2020,” project “Mejora de la ICTS Gran Telescopio CANARIAS (2016-2020).”
Funding Information:
Based on observations made with the Gran Telescopio Canarias (GTC), installed at the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de CANARIAS, on the island of La Palma. We acknowledge the outstanding support of the GTC science and engineering staff who made these observations possible. This research was supported in part by the National Science Foundation under grants AST-1515331 and AST-1908625 to C.M.T. and AST-1908123 to B.T.D. C.M.W. acknowledges financial support during the period 2012-2017 from an Australian Research Council Future Fellowship FT100100495. The upgrade of CanariCam was cofinanced by the European Regional Development Fund (ERDF), within the framework of the “Programa Operativo de Crecimiento Inteligente 2014-2020,” project “Mejora de la ICTS Gran Telescopio CANARIAS (2016-2020).”
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 -