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arXiv 0705.4252astro-ph
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光学引力透镜中存在四重问题吗?

Is There a Quad Problem among Optical Gravitational Lenses?

Masamune Oguri

摘要:

最近在斯隆数字巡天类星体透镜搜索(SQLS)中发现的大多数光学引力透镜都有两个图像而不是四个图像,与射电透镜形成鲜明对比,射电透镜的四个图像透镜的比例(四分之一)相当高。我们重新考虑的SQLS的选择功能的光学镜头之间的四分之一。我们发现,目前观察到的四分之一的SQLS确实低于,但与我们的理论模型的预测一致。光学透镜的四分之一很低,而射电透镜的四分之一很高,这意味着类星体的光学光度函数有一个相对较浅的暗端斜率。

英文摘要:

Most of optical gravitational lenses recently discovered in the Sloan Digital Sky Survey Quasar Lens Search (SQLS) have two-images rather than four-images, in marked contrast to radio lenses for which the fraction of four-image lenses (quad fraction) is quite high. We revisit the quad fraction among optical lenses by taking the selection function of the SQLS into account. We find that the current observed quad fraction in the SQLS is indeed lower than, but consistent with, the prediction of our theoretical model. The low quad fraction among optical lenses, together with the high quad fraction among radio lenses, implies that the quasar optical luminosity function has a relatively shallow faint end slope.

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