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arXiv 0807.0590astro-ph
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高红移天体、类星体和活动星系核的哈勃图

The Hubble diagram of high redshift objects, QSOs and AGNs

C. E. Navia, C. R. A. Augusto, K. H. Tsui

摘要:

根据哈勃定律,高红移天体如类星体(QSO)、X射线活动星系核(AGN)和伽马射线暴(GRB)是最快和最远的天体。这些特性提供了强大的动机,使它们被用来约束宇宙学参数,而没有Ia超新星研究中发现的限制,并且仅限于红移高达1.7。然而,类星体和活动星系核光谱的变化和行为告诉我们,它们具有非常复杂的结构,标准的蜡烛框架不能适用。迄今为止,已有的类星体和活动星系核的观测资料显示,它们在亮度和金属丰度方面存在着一些反常现象,这在传统的观点下是难以理解的。在这里,我们表明他们的哈勃图是$z\geq 3 $的。由于高红移河外天体的统计数据仍然很差,这一结果还需要进一步的证实。这些结果的细节和一些影响报告在这项工作中。

英文摘要:

According to the Hubble law, high redshift objects such as Quasar (QSOs), X-ray Active Galactic Nuclei (AGN) together with the Gamma Ray Burst (GRBs) are the fastest and farthest objects. These characteristics provides strong motivations for they to be used to constrain the cosmological parameters, without the limitations found in the Ia supernovae study and which is restricted to redshift of up to 1.7. However, the variability and behavior in the QSOs and AGNs spectra tell us that they have very complex structures and the standard candle framework can not be applied. So far the available data of QSOs and AGNs have shown some anomalies observed in their brightness and metallicities, difficult to understand, under an orthodox point of view. Here, we show that their Hubble diagram flattens for $z\geq 3 $. The result need further confirmation, because the statistics of high redshift extragalactic objects is still poor. Details and some implications of these results are reported in this work.

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