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arXiv 1301.6771astro-ph.HE
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瞬态相对论喷流动力机制的观测约束

Observational constraints on the powering mechanism of transient relativistic jets

D. M. Russell, E. Gallo, R. P. Fender

摘要:

我们重新审视了吸积黑洞系统中喷流功率对黑洞自旋的依赖性。在以前的论文中,我们表明,由于吸积到X射线双星中的黑洞上而连续发射的致密喷流的光度(类似于那些主导活动星系核动力学反馈的喷流)似乎与报道的黑洞自旋测量无关。因此,目前还不清楚黑洞自旋能量的提取是否是从吸积黑洞中驱动紧凑喷流的主要驱动力。偶尔,黑洞X射线双星产生离散的,短暂的(弹道)喷流超过吸积状态的变化。在这里,我们量化这些瞬态喷流的功率(采用两种方法来推断喷流功率)对黑洞自旋的依赖性,利用现有文献中的所有可用数据,其中包括12个黑洞的测量自旋参数和无线电耀斑在状态转换。在几个来源中,定期的、采样良好的无线电监测表明,峰值无线电通量根据爆发的不同而有很大的不同(高达1000倍),而激发耀斑所需的总功率在爆发之间可能只相差~<4倍。峰值通量取决于耀斑的总能量和辐射时间(在爆发之间可能会有很大变化)。使用贝叶斯拟合例程,我们排除了统计上显着的正相关关系,使用这些方法测量的瞬态喷流功率,和当前的估计黑洞自旋。即使在选择子样本的数据,忽略了黑洞自旋测量或喷流功率测量的一些方法,没有相关性被发现在所有情况下。

英文摘要:

We revisit the paradigm of the dependency of jet power on black hole spin in accreting black hole systems. In a previous paper we showed that the luminosity of compact jets continuously launched due to accretion onto black holes in X-ray binaries (analogous to those that dominate the kinetic feedback from AGN) do not appear to correlate with reported black hole spin measurements. It is therefore unclear whether extraction of the black hole spin energy is the main driver powering compact jets from accreting black holes. Occasionally, black hole X-ray binaries produce discrete, transient (ballistic) jets for a brief time over accretion state changes. Here, we quantify the dependence of the power of these transient jets (adopting two methods to infer the jet power) on black hole spin, making use of all the available data in the current literature, which includes 12 BHs with both measured spin parameters and radio flares over the state transition. In several sources, regular, well-sampled radio monitoring has shown that the peak radio flux differs dramatically depending on the outburst (up to a factor of 1000) whereas the total power required to energise the flare may only differ by a factor ~< 4 between outbursts. The peak flux is determined by the total energy in the flare and the time over which it is radiated (which can vary considerably between outbursts). Using a Bayesian fitting routine we rule out a statistically significant positive correlation between transient jet power measured using these methods, and current estimates of black hole spin. Even when selecting subsamples of the data that disregard some methods of black hole spin measurement or jet power measurement, no correlation is found in all cases.

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