Particle acceleration and magnetic field structure in PKS 2155−304: optical polarimetric observations
Particle acceleration and magnetic field structure in PKS 2155−304: optical polarimetric observations
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PKS 2155−304 中的粒子加速度和磁场结构：光学偏振观测
DOI：
10.1111/j.1365-2966.2010.17236.x
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发表时间：
2010
影响因子：
4.8
通讯作者：
C. Boisson
中科院分区：
文献类型：
--
作者：
U. D. Almeida;M. Ward;T. Dominici;Z. Abraham;Gabriel A. P. Franco;M. Daniel;P. Chadwick;C. Boisson
在本文中，我们提出了多波段光学偏振观测的非常高的能量blazar PKS 2155-304同时与HESS/费米高能运动在2008年，当源被发现处于低状态。密集的每日覆盖的数据集，使我们能够详细研究的时间演变的排放，我们发现，粒子加速的时间尺度是解耦的偏振特性的源的变化。我们提出了一个模型，其中的光学偏振发射起源于偏振毫米波核心，并提出了一个解释缺乏光度和偏振通量之间的相关性。的光发射是一致的非均匀的同步辐射源，其中的大规模的字段是本地组织的冲击，其中发生粒子加速。最后，我们使用这些光学偏振观测PKS 2155-304在一个低的状态，提出一个静止的伽马射线通量的对象的起源，试图提供线索的来源，其最近建立的持续TeV的排放。
In this paper, we present multiband optical polarimetric observations of the very-high energy blazar PKS 2155-304 made simultaneously with a HESS/Fermi high-energy campaign in 2008, when the source was found to be in a low state. The intense daily coverage of the data set allowed us to study in detail the temporal evolution of the emission, and we found that the particle acceleration time-scales are decoupled from the changes in the polarimetric properties of the source. We present a model in which the optical polarimetric emission originates at the polarized mm-wave core and propose an explanation for the lack of correlation between the photometric and polarimetric fluxes. The optical emission is consistent with an inhomogeneous synchrotron source in which the large-scale field is locally organized by a shock in which particle acceleration takes place. Finally, we use these optical polarimetric observations of PKS 2155-304 at a low state to propose an origin for the quiescent gamma-ray flux of the object, in an attempt to provide clues for the source of its recently established persistent TeV emission.