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首页> 外文期刊>Frontiers in Astronomy and Space Sciences >Pair-Matching of Radio-Loud and Radio-Quiet AGNs
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Pair-Matching of Radio-Loud and Radio-Quiet AGNs

机译：大声和无声AGN的配对

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Active galactic nuclei (AGNs) are known to cover an extremely broad range of radio luminosities and the spread of their radio-loudness is very large at any value of the Eddington ratio. This implies very diverse jet production efficiencies which can result from the spread of the black hole spins and magnetic fluxes. Magnetic fluxes can be developed stochastically in the innermost zones of accretion discs, or can be advected to the central regions prior to the AGN phase. In the latter case ev{there could be} systematic differences between the properties of galaxies hosting radio-loud (RL) and radio-quiet (RQ) AGNs. In the former case the differences should be negligible for objects having the same Eddington ratio. To study the problem we decided to conduct a comparison study of host galaxy properties of RL and RQ AGNs. In this study we selected type II AGNs from SDSS spectroscopic catalogues. Our RL AGN sample consists of the AGNs appearing in the citet{Best.Heckman.2012a} catalogue of radio galaxies. To compare RL and RQ galaxies that have the same AGN parameters we matched the galaxies in black hole mass, Eddington ratio and redshift. We compared several properties of the host galaxies in these two groups of objects like galaxy mass, colour, concentration index, line widths, morphological type and interaction signatures. We found that in the studied group RL AGNs are preferentially hosted by elliptical galaxies while RQ ones are hosted by galaxies of earlier type. We also found that the fraction of interacting galaxies is the same in both groups of AGNs. These results suggest that the magnetic flux in RL AGNs is advected to the nucleus prior to the AGN phase.
机译：已知活跃的银河核（AGN）覆盖非常广泛的无线电发光度，并且在任何爱丁顿比值下，其无线电响度的扩散范围都很大。这意味着黑洞自旋和磁通量的扩散可能会导致喷射生产效率的差异很大。磁通量可以在吸积盘的最内部区域中随机产生，也可以在AGN阶段之前平流到中心区域。在后一种情况下，容纳无线电大声（GN）和无线电无声（RQ）AGN的星系的属性之间可能存在系统差异。在前一种情况下，对于具有相同爱丁顿比的物体，差异应该可以忽略不计。为了研究该问题，我们决定对RL和RQ AGN的宿主星系特性进行比较研究。在这项研究中，我们从SDSS光谱目录中选择了II型AGN。我们的RL AGN样本由出现在 citet {Best.Heckman.2012a}射电星系目录中的AGN组成。为了比较具有相同AGN参数的RL和RQ星系，我们在黑洞质量，爱丁顿比和红移方面匹配了这些星系。我们在这两组对象中比较了宿主星系的几种属性，例如星系质量，颜色，浓度指数，线宽，形态类型和相互作用特征。我们发现，在研究组中，RL AGNs优先由椭圆星系承载，而RQ AGNs则由较早类型的星系承载。我们还发现，在两组AGN中相互作用星系的比例相同。这些结果表明，RL AGNs中的磁通量在AGN相之前平移到原子核。

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