Radiation signatures from striped blazar jet
Radiation signatures from striped blazar jet
复制标题
条纹布拉泽射流的辐射特征
DOI：
10.1093/mnras/stab008
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发表时间：
2021
影响因子：
4.8
通讯作者：
Giannios, Dimitrios
中科院分区：
文献类型：
--
作者：
Zhang, Haocheng;Giannios, Dimitrios
来自超大质量黑洞的相对论喷流是宇宙中最强大和最明亮的天体物理系统之一。我们建议，开放的磁场线通过黑洞，驱动一个强磁化的射流，可能有他们的极性反转的时间尺度相关的磁盘中的磁旋转发电机的增长，导致耗散结构的特点是反转环向场极性，被称为“条纹”的射流。条纹之间的磁重联消散了磁能，并为喷流加速提供动力。条纹喷流模型可以在一个统一的物理图像中解释喷流加速、大尺度喷流发射和耀变体发射特征。具体地说，我们发现喷流加速到体洛伦兹因子Γ 10内1秒差距的距离从中央发动机。加速度减慢，但在更大的距离上继续，内在加速度在到几十秒差距之间，这与最近的无线电观测非常一致。磁重联持续加速非热粒子在大的距离从中央引擎，导致核心移位效应和整体平坦到倒置的同步加速器光谱。大尺度光谱光度峰ν peak与耗散峰的位置成反比，耗散峰的位置由最小条纹宽度lmin设定。耀变体区大致在同一位置。在这个距离，喷流是中等磁化，与同动磁场强度和耗散功率符合典型的轻子blazar模型参数。
Relativistic jets from supermassive black holes are among the most powerful and luminous astrophysical systems in Universe. We propose that the open magnetic field lines through the black hole, which drive a strongly magnetized jet, may have their polarity reversing over time scales related to the growth of the magnetorotational dynamo in the disc, resulting in dissipative structures in the jet characterized by reversing toroidal field polarities, referred to as ‘stripes’. The magnetic reconnection between the stripes dissipates the magnetic energy and powers jet acceleration. The striped jet model can explain the jet acceleration, large-scale jet emission, and blazar emission signatures consistently in a unified physical picture. Specifically, we find that the jet accelerates to the bulk Lorentz factor Γ ≳ 10 within 1-parsec distance from the central engine. The acceleration slows down but continues at larger distances, with intrinsic acceleration ratebetweenandat tens of parsecs, which is in very good agreement with recent radio observations. Magnetic reconnection continuously accelerates non-thermal particles over large distances from the central engine, resulting in the core-shift effect and overall flat-to-inverted synchrotron spectrum. The large-scale spectral luminosity peakνpeakis antiproportional to the location of the peak of the dissipation, which is set by the minimal stripe widthlmin. The blazar zone is approximately at the same location. At this distance, the jet is moderately magnetized, with the comoving magnetic field strength and dissipation power consistent with typical leptonic blazar model parameters.
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影响因子：
4.8
作者：
M. Petropoulou;I. Christie;L. Sironi;D. Giannios
通讯作者：
M. Petropoulou;I. Christie;L. Sironi;D. Giannios
影响因子：
4.9
作者：
Ball, David;Ozel, Feryal;Sironi, Lorenzo
通讯作者：
Sironi, Lorenzo
影响因子：
6.5
作者：
A. Sandrinelli;S. Covino;A. Treves
通讯作者：
A. Sandrinelli;S. Covino;A. Treves
影响因子：
4.8
作者：
I. Christie;M. Petropoulou;L. Sironi;D. Giannios
通讯作者：
I. Christie;M. Petropoulou;L. Sironi;D. Giannios
影响因子：
8.7
作者：
Lister, M. L.;Aller, M. F.;Savolainen, T.
通讯作者：
Savolainen, T.