The infrared and radio-continuum emission of the galactic disk
The infrared and radio-continuum emission of the galactic disk
复制标题
银盘的红外和射电连续发射
作者：
C. Haslam;J. Osborne
1983年，红外天文卫星（IRAS）在远红外（FIR）的四个波段对天空进行了观测。这次巡天的成果之一1是一幅详细的图片，角分辨率为0.44角分，显示了银道面上星际尘埃的红外辐射。在这里，我们指出60微米波段的辐射与赖希等人2在4.3弧分的束宽下测量的11厘米射电连续辐射中的大多数特征之间存在非常详细的相关性。首先，它支持了考克斯等人3的模型，其中60微米波段的辐射主要来自与扩展的低密度（ELD）H II区有关的尘埃。第二，它提供了一种方法来分离无线电连续谱的热分量，通过其相关的红外发射来识别，从同步加速器分量。当比较红外和射电图时，已知的超新星遗迹作为没有相应红外辐射的射电源而引人注目。通过寻找其他没有红外线辐射的射电源，可以找到迄今为止尚未发现的超新星遗迹的候选者。用这种方法获得了不受热辐射污染的同步辐射后，将揭示银道面附近更大尺度的银河磁场结构。
In 1983 the Infrared Astronomical Satellite (IRAS) surveyed the sky in four wavebands in the far infrared (FIR). One of the products of this survey1 is a detailed picture with an angular resolution of ∼4 arc min of the infrared emission of the interstellar dust in the galactic plane. Here we point out the remarkably detailed correlation between the 60-µm band emission and most of the features in the 11-cm radio-continuum emission as measured by Reich et al.2 with a beam width of 4.3 arc min. This correlation has two consequences. First, it gives support to the model of Cox et al. 3 in which the 60-µm band emission arises mainly from dust associated with extended low-density (ELD) H II regions. Second, it provides a way of separating the thermal component of the radio continuum, identified by its associated infrared emission, from the synchrotron component. When the infrared and radio maps are compared, the known supernova remnants stand out boldly as radio sources which do not have the corresponding infrared emission. Candidates for hitherto undiscovered supernova remnants can be found by looking for additional radio sources lacking infrared emission. Larger-scale structure of the galactic magnetic field near the galactic plane will be revealed after the synchrotron emission, uncontaminated by thermal emission, has been obtained in this way.