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EVIDENCE FOR A LARGE UNDETECTED POPULATION OF DUST-REDDENED QUASARS

机译：大量粉尘类石英的未发现人口的证据

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QUASARS have been detected at many wavelengths, but often ones that are bright at one wavelength are very faint or undetectable at other wavelengths. It has therefore been impossible to design a single search technique that would identify all quasars, raising the question of how many may have gone unidentified. Here we show that quasars selected from a radio catalogue have a wide range of optical colours, which we interpret as arising from varying amounts of dust along the line of sight. Most of this dust probably lies within the quasar host galaxy. If the radio-quiet quasars that would normally be detected optically contain as much dust as the radio-loud ones (and have gone undetected at other wavelengths), then 80% of them have been missed by optical surveys. These missing quasars could adequately account for the observed X-ray background. [References: 21]
机译：已经在许多波长下检测到QUASARS，但是通常在一个波长下较亮的QUASARS在其他波长下非常微弱或无法检测到。因此，不可能设计出一种能够识别所有类星体的单一搜索技术，从而提出了可能有多少个未被识别的问题。在这里，我们表明，从无线电目录中选择的类星体具有多种光学颜色，我们将其解释为是由于沿视线方向上的尘埃量不同而引起的。这些尘埃中的大部分可能位于类星体宿主星系内。如果通常在光学上可以检测到的无声类星体包含的尘埃数量与无声类星体一样多（并且在其他波长下未被检测到），则光学测量会漏掉它们中的80％。这些缺失的类星体可以充分说明观察到的X射线背景。 [参考：21]

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