标题： NGC 1976在射电范围内的结构 显示英文标题

标题： The Structure of NGC 1976 in the Radio Range

摘要： 高角分辨率射电连续谱图像，频率为330 MHz（波长=91 cm）、1.5 GHz（20 cm）和10.6 GHz（2.8 cm）的NGC 1976（M42，猎户座A），已对齐并放置在共同的网格上，平滑到共同的分辨率80"（=0.16 pc在420 pc处）和90"（=0.18 pc），并在逐位置的基础上进行比较。 结果与单一Te值不一致。相反，存在显著的变化，从低强度、扩展区域的Te=6000K到高强度、更紧凑区域的Te=8500K。 数据的最佳拟合是一个从射电重组线（RRL）数据获得的多层模型。 从模型中估计温度波动得到t2=0.003。 这比光学O++线数据的波动值低一个数量级。 显示英文摘要

摘要： High angular resolution radio continuum images of NGC 1976 (M42, Orion A) at frequency=330 MHz (wavelength=91 cm), 1.5 GHz (20 cm) and 10.6 GHz (2.8 cm), have been aligned, placed on a common grid, smoothed to common resolutions of 80" (=0.16 pc at 420 pc) and 90" (=0.18 pc) and compared on a position-by-position basis. The results are not consistent with a single value of Te. Rather, there is a significant variation, from Te =6000K in the low intensity, extended region to Te=8500K in the higher intensity, more compact region. The best fit to the data is a multi-layer model obtained from radio recombination line (RRL) data. An estimate of temperature fluctuations from the model yields t2=0.003. This is a factor of 10 lower than fluctuation values from optical O++ line data.