论文标题
映射星际灰尘的脂肪液烃含量向银河系中心的方法
A method for mapping the aliphatic hydrocarbon content of interstellar dust towards the Galactic Centre
论文作者
论文摘要
在星际介质中，宇宙元素碳的丰度包括气体和固相的总碳。该研究的目的是试验一种新方法，用于测量星际尘埃中脂肪族碳在我们银河系的视野上的数量和分布。该方法基于脂肪族碳质物质的3.4 $ $ M吸收特征的测量。对于使用红外光谱仪，可以很容易地实现这一点。但是，在宽字场上进行此类测量需要一个成像IR摄像头，该摄像机配备了能够采样频谱的窄带过滤器。尽管这不能产生光谱的确定，但该技术可以同时在相机视野上同时应用于数百个来源。我们检查了该方法在银河系中心的田地，并制作了一张地图，显示其跨它的光学深度为3.4 $ $。
In the interstellar medium, the cosmic elemental carbon abundance includes the total carbon in both gas and solid phases. The aim of the study was to trial a new method for measuring the amount and distribution of aliphatic carbon within interstellar dust over wide fields of view of our Galaxy. This method is based on measurement of the 3.4 $μ$m absorption feature from aliphatic carbonaceous matter. This can readily be achieved for single sources using IR spectrometers. However, making such measurements over wide fields requires an imaging IR camera, equipped with narrow-band filters that are able to sample the spectrum. While this cannot produce as good a determination of the spectra, the technique can be applied to potentially tens to hundreds of sources simultaneously, over the field of view of the camera. We examined this method for a field in the centre of the Galaxy, and produced a map showing the variation of 3.4 $μ$m optical depth across it.
