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- In astronomy, dropout is a radiation source whose radiation intensity falls off sharply below a specific wavelength. The source will be easily visible when its light is filtered to wavelengths longer than the cutoff value, but will "drop out" of the image when it is filtered to wavelengths shorter than the threshold. This is a standard method for locating distant galaxies in deep field images. Because the hydrogen that surrounds the galaxies absorbs light with a wavelength around 100 nanometers, the galaxies have a natural dropout threshold. The exact wavelength of this threshold is redshifted and can be used to determine the distance to the galaxy. (en)
- 漏失，在天文學是輻射源的輻射強度大幅降低，以致低於某一特定波長。這個源在通過比截止值波長更長波的濾鏡之前是顯而易見的，但是當濾鏡的波長短於此門檻時，影像就"漏失"。 這是為深空影像中的遙遠星系定位的標準方法。因為環繞在星系周圍的氫會吸收大約100奈米波長的光，使星系有天然的漏失值。這個漏失值的精確波長被紅移，因而可以用於確定星系的距離。 (zh)
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- 漏失，在天文學是輻射源的輻射強度大幅降低，以致低於某一特定波長。這個源在通過比截止值波長更長波的濾鏡之前是顯而易見的，但是當濾鏡的波長短於此門檻時，影像就"漏失"。 這是為深空影像中的遙遠星系定位的標準方法。因為環繞在星系周圍的氫會吸收大約100奈米波長的光，使星系有天然的漏失值。這個漏失值的精確波長被紅移，因而可以用於確定星系的距離。 (zh)
- In astronomy, dropout is a radiation source whose radiation intensity falls off sharply below a specific wavelength. The source will be easily visible when its light is filtered to wavelengths longer than the cutoff value, but will "drop out" of the image when it is filtered to wavelengths shorter than the threshold. (en)
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- Dropout (astronomy) (en)
- 漏失 (天文學) (zh)
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