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arXiv 1702.01157astro-ph.GAastro-ph.HE
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动力学主导类星体3C~418

The Kinetically Dominated Quasar 3C~418

Brian Punsly, Preeti Kharb

摘要:

动力学主导的类星体的存在,喷流动力学光度,$Q$,大于总的(IR到X射线)的吸积流,$L_{\rm{bol}}$的热光度,相对论喷流形成的基本物理提供了一个强有力的约束。由于类星体的$L_{\rm{bol}}$值很高,因此只发现了$\sim 10$动力学主导的类星体(具有$\overline{Q}/L_{\rm{bol}}>1$),其中$\overline{Q}$是长期时间平均喷流功率。我们利用类星体3C,418的低频(151 MHz $-$ 1.66 GHz)观测来确定$\overline{Q}\approx 5.5 \pm 1.3 \times 10^{46} \rm{ergs~s^{-1}}$。对静止帧紫外光谱的分析表明,这相当于$0.57 \pm 0.28$乘以中央超大质量黑洞和$\overline{Q}/L_{\rm{bol}} \approx 4.8 \pm 3.1$的爱丁顿光度,使3C\,418成为迄今为止发现的动力学最主导的类星体之一。结果表明,这一最大的$\overline{Q}/L_{\rm{bol}}$是一致的磁制动吸积的喷气生产模型,其中的喷气生产再现了所观察到的趋势,在极紫外连续的递减作为喷气功率的增加。这种最大条件对应于几乎完全饱和的内部吸积流与垂直大尺度磁通量(最大饱和)。

英文摘要:

The existence of quasars that are kinetically dominated, where the jet kinetic luminosity, $Q$, is larger than the total (IR to X-ray) thermal luminosity of the accretion flow, $L_{\rm{bol}}$, provides a strong constraint on the fundamental physics of relativistic jet formation. Since quasars have high values of $L_{\rm{bol}}$ by definition, only $\sim 10$ kinetically dominated quasars (with $\overline{Q}/L_{\rm{bol}}>1$) have been found, where $\overline{Q}$ is the long term time averaged jet power. We use low frequency (151 MHz$-$1.66 GHz) observations of the quasar 3C\,418 to determine $\overline{Q}\approx 5.5 \pm 1.3 \times 10^{46} \rm{ergs~s^{-1}}$. Analysis of the rest frame ultraviolet spectrum indicates that this equates to $0.57 \pm 0.28$ times the Eddington luminosity of the central supermassive black hole and $\overline{Q}/L_{\rm{bol}} \approx 4.8 \pm 3.1$, making 3C\,418 one of the most kinetically dominated quasars found to date. It is shown that this maximal $\overline{Q}/L_{\rm{bol}}$ is consistent with models of magnetically arrested accretion of jet production in which the jet production reproduces the observed trend of a decrement in the extreme ultraviolet continuum as the jet power increases. This maximal condition corresponds to an almost complete saturation of the inner accretion flow with vertical large scale magnetic flux (maximum saturation).

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