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首页> 外文期刊>The Astrophysical journal >ON THE PUZZLE OF THE OBSERVED NARROWING OF RADIO RECOMBINATION LINES
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ON THE PUZZLE OF THE OBSERVED NARROWING OF RADIO RECOMBINATION LINES

机译：无线电重组线可观察到的拼图问题

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摘要

Recently, Bell et al. accurately measured in several giant H Ⅱ regions both the width and the area of a great number of hydrogen radio recombination lines (RRLs)—up to the principal quantum number n = 274. For observations made at a frequency of 6 GHz, the measured line widths increased with the growth of n, but upon reaching some critical value n = n_(cr) ～ 200, the line widths started to decrease rapidly with the further growth of n, while the line areas simultaneously increased above the predicted values. We show that the allowance for collisions with ions—especially for the transition from the impact limit of the ion Stark broadening at relatively low n to the quasi-static limit at relatively high n—could explain the puzzle of the narrowing of the RRLs observed by Bell et al.
机译：最近，贝尔等。在大量HⅡ区域中精确地测量了许多氢无线电重组线（RRL）的宽度和面积，直至主量子数n =274。对于在6 GHz频率下的观测，测量线宽度随着n的增加而增加，但是当达到某个临界值n = n_（cr）〜200时，线宽度随着n的进一步增加而开始迅速减小，而线面积同时增加到高于预测值。我们表明，与离子碰撞的余量（尤其是从离子斯塔克在较低n处扩展的冲击极限到在较高n处的准静态极限的过渡）可以解释由RRL变窄的难题。贝尔等。

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