论文标题
弥漫性星际培养基向CYGOB2-12的中红外极化
Mid-Infrared Polarization of the Diffuse Interstellar Medium toward CygOB2-12
论文作者
论文摘要
我们介绍了第一个IR对线性极化对星Cygob2-12的检测，这是一个发光的蓝色超级巨星，在〜10 mag的前景灭绝中，它是研究弥漫性星际介质中灰尘特性的基准。 8-13微米的光谱极仪表法在Gran Telescopio Canarias（GTC）上使用Canaricam多模式摄像头获得，显示了星际磁场中对齐的硅酸盐晶粒的波长特征的清晰趋势。在10.2微米接近10.2微米的7.8统计显着性上检测到的最大极化为（1.24 +/- 0.28）％，位置角（126 +/- 8）度。我们在最新模型中对这些测量值进行评论，以弥漫性星际介质中的灰尘组成。
We present the first mid-IR detection of the linear polarization toward the star CygOB2-12, a luminous blue hypergiant that, with Av of ~10 mag of foreground extinction, is a benchmark in the study of the properties of dust in the diffuse interstellar medium. The 8-13 micrometer spectropolarimetry, obtained with the CanariCam multi-mode camera at the Gran Telescopio Canarias (GTC), shows clear trends with wavelength characteristic of silicate grains aligned in the interstellar magnetic field. The maximum polarization, detected with 7.8 statistical significance near 10.2 micrometers, is (1.24 +/- 0.28) % with position angle (126 +/- 8) deg. We comment on these measurements in the context of recent models for the dust composition in the diffuse interstellar medium.
