| dbo:abstract |
The Doppler parameter, or Doppler broadening parameter, usually denoted as , is a parameter commonly used in astrophysics to characterize the width of observed spectral lines of astronomical objects. It is defined as , where is the one-dimensional velocity dispersion . Given this parameter, the velocity distribution of the line-emitting/absorbing atoms and ions proximated by a Gaussian can be rewritten as , where is the probability of the velocity along the line of sight being in the interval . The line width is also often specified in terms of the FWHM (full width at half maximum), which is . (en) 多普勒参数（英語：Doppler parameter），或多普勒致宽参数（英語：Doppler broadening parameter）是天体物理中常用来标示天体谱线宽度的物理量，通常用字母表示。其定义为 其中是一维速度弥散（，p.58）。通过这一参数，产生该谱线的粒子的高斯速度分布可被表示为 其中表示粒子的视向速度处于区间内的概率。 谱线的宽度也经常用半峰全宽（FWHM）来表示，其与多普勒参数的转换关系为 . (zh) |
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| rdfs:comment |
多普勒参数（英語：Doppler parameter），或多普勒致宽参数（英語：Doppler broadening parameter）是天体物理中常用来标示天体谱线宽度的物理量，通常用字母表示。其定义为 其中是一维速度弥散（，p.58）。通过这一参数，产生该谱线的粒子的高斯速度分布可被表示为 其中表示粒子的视向速度处于区间内的概率。 谱线的宽度也经常用半峰全宽（FWHM）来表示，其与多普勒参数的转换关系为 . (zh) The Doppler parameter, or Doppler broadening parameter, usually denoted as , is a parameter commonly used in astrophysics to characterize the width of observed spectral lines of astronomical objects. It is defined as , where is the one-dimensional velocity dispersion . Given this parameter, the velocity distribution of the line-emitting/absorbing atoms and ions proximated by a Gaussian can be rewritten as , where is the probability of the velocity along the line of sight being in the interval . . (en) |
| rdfs:label |
Doppler parameter (en) 多普勒参数 (zh) |
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