arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1507.00345astro-ph.CO
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在XXL巡天中预测的多重成像X射线活动星系核

Predicted multiply-imaged X-ray AGNs in the XXL survey

F. Finet, A. Elyiv, O. Melnyk, O. Wertz, C. Horellou, J. Surdej

摘要:

我们估计了XXL场中X射线选择点状源的光学对应物中多重成像活动星系核的入射。我们还得到预期的统计特性,如红移分布的透镜源和偏转器,导致形成多个图像,建模的偏转器使用球形(SIS)和椭球形(SIE)奇异等温质量分布。我们进一步假设,XXL调查样本具有相同的整体属性作为较小的XMM-COSMOS样本限制在相同的通量限制,并考虑到检测概率的XXL调查。在[0.5-2] keV波段通量大于3.0 × 10 $^{-15}$ erg cm $^{-2}$ s $^{-1}$且光学对应物比r波段星等25亮的X射线源中,我们预计约有20个多重成像源。如果在活动星系核的X射线光学对应物的视限图像中进行搜索,其中约16个应该被检测到,并且其中只有一个应该由两个以上的透镜图像组成。最后,我们研究了宇宙学模型对透镜源的预期分数的影响。

英文摘要:

We estimate the incidence of multiply-imaged AGNs among the optical counterparts of X-ray selected point-like sources in the XXL field. We also derive the expected statistical properties of this sample, such as the redshift distribution of the lensed sources and of the deflectors that lead to the formation of multiple images, modelling the deflectors using both spherical (SIS) and ellipsoidal (SIE) singular isothermal mass distributions. We further assume that the XXL survey sample has the same overall properties as the smaller XMM-COSMOS sample restricted to the same flux limits and taking into account the detection probability of the XXL survey. Among the X-ray sources with a flux in the [0.5-2] keV band larger than 3.0x10$^{-15}$ erg cm$^{-2}$ s$^{-1}$ and with optical counterparts brighter than an r-band magnitude of 25, we expect ~20 multiply-imaged sources. Out of these, ~16 should be detected if the search is made among the seeing-limited images of the X-ray AGN optical counterparts and only one of them should be composed of more than two lensed images. Finally, we study the impact of the cosmological model on the expected fraction of lensed sources.

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