Magnetization of jets in luminous blazars
Magnetization of jets in luminous blazars
复制标题
DOI：
10.1093/mnras/stv200
复制
发表时间：
2014-11
影响因子：
4.8
通讯作者：
M. Janiak;M. Sikora;R. Moderski
中科院分区：
文献类型：
--
作者：
M. Janiak;M. Sikora;R. Moderski
许多强大的耀变体的亮度主要由$\gamma$射线主导，这很可能是由喷流外部产生的辐射的康普顿化产生的。这一观测结果对喷流的成分和能量以及周围类星体环境设置了一定的限制。我们研究了康普顿优势对射流磁化强度（磁性到物质的能量通量）和“耀变体区”位置的依赖性。对宽发射线和热尘区域的两种几何形状进行计算：球形和平面。发现与观察到的大康普顿优势相对应的射流磁化强度对于球形几何形状为 $\sim 0.1 (\theta_{\rm j} \Gamma)^2$ ，对于平面几何形状为 $\sim 0.01 (\theta_{\rm j} \Gamma)^2$ ，其中 $\theta_{\rm j}$ 是射流半开角，$\Gamma$ 是射流洛伦兹因子。这意味着发光耀变体中的射流是物质主导的，并且这种主导对于外部辐射源的扁平几何形状尤其强烈。
Luminosities of many powerful blazars are strongly dominated by $\gamma$-rays which most likely result from Comptonization of radiation produced outside a jet. This observation sets certain constraints on composition and energetics of the jet as well as the surrounding quasar environment. We study the dependence of a Compton dominance on a jet magnetization (the magnetic-to-matter energy flux) and on the location of the 'blazar zone'. Calculations are performed for two geometries of broad-emission-line and hot-dust regions: spherical and planar. The jet magnetization corresponding to the large observed Compton dominance is found to be $\sim 0.1 (\theta_{\rm j} \Gamma)^2$ for spherical geometries and $\sim 0.01 (\theta_{\rm j} \Gamma)^2$ for planar geometries, where $\theta_{\rm j}$ is the jet half-opening angle and $\Gamma$ is the jet Lorentz factor. This implies that jets in luminous blazars are matter dominated and that this domination is particularly strong for the flattened geometry of external radiation sources.