New constraints on the structure and dynamics of black hole jets
New constraints on the structure and dynamics of black hole jets
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黑洞喷流结构和动力学的新约束
DOI：
10.1093/mnras/stv1657
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发表时间：
2015
影响因子：
4.8
通讯作者：
G. Cotter
中科院分区：
文献类型：
--
作者：
W. Potter;G. Cotter
吸积黑洞产生强大的相对论性等离子体射流，其发射的辐射跨越所有可观测的波长，但射流的初始加速和约束的细节是不确定的。我们采用了一种创新的新模型，使我们能够通过多频率观测来确定加速区的关键特性。该模型的中心组成部分是一个相对论的稳态流体流动，从物理上不同的区域的发射可以看出，有助于不同的能带在整个光谱。通过以前所未有的精度拟合到42个同步多波长耀变体光谱，我们能够约束最亮的同步辐射发射区域的位置，并表明喷气功率和喷气最亮区域的半径之间必须存在线性关系。我们还发现了加速区域的长度和最大的批量洛伦兹因子的射流之间的相关性，并找到证据的双峰分布的吸积率在耀变体人口。这使我们能够限制blazar喷流的基本动力学和结构特性，并了解导致blazar序列的潜在物理差异。
Accreting black holes produce powerful relativistic plasma jets which emit radiation across all observable wavelengths but the details of the initial acceleration and confinement of the jet are uncertain. We apply an innovative new model that allows us to determine key properties of the acceleration zone via multi-frequency observations. The central component of the model is a relativistic steady-state fluid flow, and the emission from physically distinct regions can be seen to contribute to different energy bands in the overall spectrum. By fitting with unprecedented accuracy to 42 simultaneous multiwavelength blazar spectra we are able to constrain the location of the brightest synchrotron emitting region, and show that there must be a linear relation between the jet power and the radius of the brightest region of the jet. We also find a correlation between the length of the accelerating region and the maximum bulk Lorentz factor of the jet and find evidence for a bimodal distribution of accretion rates in the blazar population. This allows us to put constraints on the basic dynamical and structural properties of blazar jets and to understand the underlying physical differences which result in the blazar sequence.