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HI 21cm absorption studies of damped Lyman-a systems

机译:HI 21CM吸收莱曼的吸收研究 - 一种系统

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HI 21cm absorption spectroscopy provides an independent probe of the nature of damped Lyman-a systems (DLAs), yielding information on their ISM conditions, kinematics, and spatial extent. We find that the majority of DLAs have significantly higher spin temperatures than seen in the Milky Way and local spirals, indicating larger fractions of the warm phase of HI, especially at high redshifts Present data suggests that the spin temperature might be used as a secondary indicator of the nature of the absorbing galaxy. We have succeeded in spatially resolving the 21cm absorption in two z ~ 0,4 DLAs, thus obtaining lower limits on the transverse extent of these absorbers.
机译:HI 21CM吸收光谱提供了Damped Lyman-A系统(DLA)性质的独立探针,产生了关于其ISM条件,运动学和空间程度的信息。我们发现大多数DLA具有明显高于银河系和局部螺旋的旋转温度,表明HI的温度较大的级分,特别是在高红移存在的数据中,旋转温度可能用作二级指标吸收星系的性质。我们成功地在两个Z〜0,4 DLA中分辨21cm吸收,从而获得这些吸收剂的横向范围的下限。

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