Is there a dichotomy in the radio loudness distribution of quasars
Is there a dichotomy in the radio loudness distribution of quasars
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DOI：
10.1046/j.1365-2966.2003.07105.x
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发表时间：
2003-06
影响因子：
4.8
通讯作者：
M. Cirasuolo;A. Celotti;M. Magliocchetti;L. Danese
中科院分区：
文献类型：
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作者：
M. Cirasuolo;A. Celotti;M. Magliocchetti;L. Danese
我们提出了一种新的方法来解决类星体的无线电响度问题。通过比较蒙特卡罗模拟样品与观测到的光学选择类星体的性质，我们约束了射电光学比的内在分布（简单）处方。我们发现了强有力的证据，证明射电亮度依赖于光学亮度，即使有很大的散射。射电响亮类星体的比例对视星等和绝对星等的依赖导致了一种与当前巡天的射电和光学极限有关的选择效应。射电光比的本征分布在R* 1处出现峰值。4 ~ 0.3，只有≤5%的对象被包含在高r * 1中。4号尾巴，它可以识别无线电噪声区域。在任何R* 1上，在无线电响群和无线电静音群之间不存在缺乏或缺乏源，而只存在一个陡峭的过渡区域。4所示。简要地说，我们讨论了这种行为的可能起源（例如，在无线电安静源中没有射流，辐射无线电效率的大范围，吸积和喷射现象的不同寿命等）。
We present a new approach to tackling the issue of radio loudness in quasars. We constrain a (simple) prescription for the intrinsic distribution of radio-to-optical ratios by comparing properties of Monte Carlo simulatedsamples with those of observed optically selected quasars. We find strong evidence for a dependence of the radio luminosity on the optical one, even though with a large scatter. The dependence of the fraction of radio-loud quasars on apparent and absolute optical magnitudes results in a selection effect related to the radio and optical limits of current surveys. The intrinsic distribution of the radio-to-optical ratios shows a peak at R* 1 . 4 ∼ 0.3, with only ≤5 per cent of objects being included in a high-R* 1 . 4 tail, which identifies the radio-loud regime. No lack or deficit of sources - but only a steep transition region - is present between the radio-loud and radio-quiet populations at any R* 1 . 4 . Briefly, we discuss possible origins for this behaviour (e.g. an absence of jets in radio-quiet sources, a large range of radiative radio efficiency, different lifetimes for the accretion and jet ejection phenomena, etc.).