An X-ray survey of the 2 Jy sample – I. Is there an accretion mode dichotomy in radio-loud AGN?
An X-ray survey of the 2 Jy sample – I. Is there an accretion mode dichotomy in radio-loud AGN?
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DOI：
10.1093/mnras/stu263
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发表时间：
2014-02
影响因子：
4.8
通讯作者：
B. Mingo;B. Mingo;M. Hardcastle;J. Croston;D. Dicken;D. Evans;R. Morganti;C. Tadhunter
中科院分区：
文献类型：
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作者：
B. Mingo;B. Mingo;M. Hardcastle;J. Croston;D. Dicken;D. Evans;R. Morganti;C. Tadhunter
利用钱德拉和xmm -牛顿观测，对0.02 < z < 0.7 Jy样品的活动核的x射线辐射进行了系统的研究。我们将我们的结果与中红外、光学发射在线和无线电观测结果结合起来，并将它们添加到3CRR源的结果中。我们表明，在我们的样品中，低激发的物体显示出辐射无效率吸积的迹象。我们研究了射流相关发射对各种光度的影响，证实了它是我们的软x射线源的主要发射源。我们还发现与吸积相关的光度之间存在很强的相关性，并确定了几个光学分类与其吸积性质不相容的源。我们推导了样品的热光度和射流动力学光度，并发现低激发和高激发种群之间总爱丁顿率的差异，前者峰值为~ 1%，后者峰值为~ 20%。当考虑环境对射电光度和黑洞质量计算的影响时，我们的结果与一个简单的爱丁顿开关是一致的。在我们的图中，射流动能和辐射亮度的明显独立性支持了一个模型，即射流产生和辐射有效吸积在高激发天体中并不强烈相关，尽管它们具有共同的潜在机制。
We carry out a systematic study of the X-ray emission from the active nuclei of the 0.02 < z < 0.7 2 Jy sample, using Chandra and XMM–Newton observations. We combine our results with those from mid-infrared, optical emission-line and radio observations, and add them to those of the 3CRR sources. We show that the low-excitation objects in our samples show signs of radiatively inefficient accretion. We study the effect of the jet-related emission on the various luminosities, confirming that it is the main source of soft X-ray emission for our sources. We also find strong correlations between the accretion-related luminosities, and identify several sources whose optical classification is incompatible with their accretion properties. We derive the bolometric and jet kinetic luminosities for the samples and find a difference in the total Eddington rate between the low- and high-excitation populations, with the former peaking at ∼1 per cent and the latter at ∼20 per cent Eddington. Our results are consistent with a simple Eddington switch when the effects of environment on radio luminosity and black hole mass calculations are considered. The apparent independence of jet kinetic power and radiative luminosity in the high-excitation population in our plots supports a model in which jet production and radiatively efficient accretion are not strongly correlated in high-excitation objects, though they have a common underlying mechanism.