The evolution of optically selected quasars with z<2.2 and B<20
The evolution of optically selected quasars with z<2.2 and B<20
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DOI：
10.1086/163685
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发表时间：
1985-12
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影响因子：
--
通讯作者：
H. Marshall
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文献类型：
--
作者：
H. Marshall
将光学选择的类星体的几个完整样本组合起来，给出类星体光度函数及其红移小于 2.2 的演化的详细信息。获得了哈勃图的足够覆盖，可以测试光度相关的密度演化模型并将其与纯光度演化模型进行比较。尽管如果演化函数具有指数形式，则表明依赖于光度的演化，但数据与独立于光度的幂律演化模型一致。当通过红移将样本分成两半时，幂律演化模型比指数模型能获得更好的拟合效果。此外，光度函数符合幂律形状，其斜率与红移无关。纯光度演化模型（其中光度演化为 (1+z)/sup 3.5/ 且光度函数由 dN/dLproportionalL/sup -3.6/ 给出）与这些结果一致，并且非常适合数据。这些结果表明，相同的质量供应和能量产生机制适用于数十年的光学光度和 z<2.2。
Several complete samples of optically selected quasars are combined to give details of the quasar luminosity function and its evolution for redshifts less than 2.2. Sufficient coverage of the Hubble diagram is obtained that luminosity-dependent density evolution models can be tested and compared against pure luminosity evolution models. Although luminosity-dependent evolution is indicated if the evolution function has an exponential form, the data are consistent with a power-law evolution model that is independent of luminosity. When the sample is split into halves by redshift, a better fit is obtained with a power-law evolution model than with an exponential model. Furthermore, the luminosity function is consistent with a power-law shape whose slope is independent of redshift. Pure luminosity evolution models wherein luminosities evolve as (1+z)/sup 3.5/ and the luminosity functioin is given by dN/dLproportionalL/sup -3.6/ are consistent with these results and fit the data very well. These results suggest that the same mass supply and energy generation mechanisms apply over several decades of optical luminosity and for z<2.2.