AN HOURGLASS MODEL FOR THE FLARE OF HST-1 IN M87
AN HOURGLASS MODEL FOR THE FLARE OF HST-1 IN M87
复制标题
M87中HST-1耀斑的沙漏模型
DOI：
10.1088/0004-6256/146/6/155
复制
发表时间：
2013-11
影响因子：
5.3
通讯作者：
Shen, Zhi-Qiang
中科院分区：
文献类型：
--
作者：
Zhao, Guang-Yao;Chen, Yong Jun;Wang, Chun-Cheng;Shen, Zhi-Qiang
为了解释M87喷流中HST-1的多波长光变曲线（从无线电到X射线），我们提出了一个沙漏模型，该模型是Tavecchio和Ghisellini（以下简称TG 08）改进的两区系统：一个缓慢的沙漏形或拉瓦尔喷嘴形层，由两个旋转的指数表面连接，围绕着一个快速的脊柱，等离子体团块流过该表面。根据磁通量守恒定律，磁场沿沙漏轴线沿着变化。我们采用TG 08的结果--双区系统可以通过逆康普顿产生从GeV到TeV的高能辐射，而从射电到X射线的光子主要由快内区系统辐射。在这里，我们只讨论快速内团从射电到X射线的光变曲线。当一个可压缩的团块沿沙漏中第一个球的轴向运动时，由于磁通量守恒，其横截面经历绝热压缩过程，导致粒子加速和HST-1的增亮。当水滴进入沙漏的第二个球时，由于磁通量守恒，结的变暗发生沿着其横截面的绝热膨胀。M87的TeV峰值可以用一个类似的破指数函数来拟合，这可能意味着M87的TeV耀斑与HST-1从射电到X射线的光变曲线之间存在相关性。HST-1的甚大阵（VLA）22 GHz射电光变曲线验证了我们基于VLA 15 GHz射电主峰拟合模型的预测。
To explain the multi-wavelength light curves (from radio to X-ray) of HST-1 in the M87 jet, we propose an hourglass model that is a modified two-zone system of Tavecchio & Ghisellini (hereafter TG08): a slow hourglass-shaped or Laval-nozzle-shaped layer connected by two revolving exponential surfaces surrounding a fast spine through which plasma blobs flow. Based on the conservation of magnetic flux, the magnetic field changes along the axis of the hourglass. We adopt the result of TG08—the high-energy emission from GeV to TeV can be produced through inverse Compton by the two-zone system, and the photons from radio to X-ray are mainly radiated by the fast inner zone system. Here, we only discuss the light curves of the fast inner blob from radio to X-ray. When a compressible blob travels down the axis of the first bulb in the hourglass, because of magnetic flux conservation, its cross section experiences an adiabatic compression process, which results in particle acceleration and the brightening of HST-1. When the blob moves into the second bulb of the hourglass, because of magnetic flux conservation, the dimming of the knot occurs along with an adiabatic expansion of its cross section. A similar broken exponential function could fit the TeV peaks in M87, which may imply a correlation between the TeV flares of M87 and the light curves from radio to X-ray in HST-1. The Very Large Array (VLA) 22 GHz radio light curve of HST-1 verifies our prediction based on the model fit to the main peak of the VLA 15 GHz radio one.
登录
查看更多内容
DOI：
10.1086/300844
发表时间：
1999-01
期刊：
The Astronomical Journal
影响因子：
--
作者：
E. Perlman;J. Biretta;F. Zhou;William B. Sparks;F. Macchetto
通讯作者：
E. Perlman;J. Biretta;F. Zhou;William B. Sparks;F. Macchetto
影响因子：
6.5
作者：
K. Hada;M. Giroletti;G. Giovannini;C. Casadio;M. Beilicke;A. Cesarini;Teddy Cheung;Akihiro Doi;Henric;Krawczynski;M. Kino;Nick Lee;H. Nagai
通讯作者：
K. Hada;M. Giroletti;G. Giovannini;C. Casadio;M. Beilicke;A. Cesarini;Teddy Cheung;Akihiro Doi;Henric;Krawczynski;M. Kino;Nick Lee;H. Nagai
影响因子：
6.5
作者：
C. Chang;E. Ros;E. Ros;Y. Kovalev;Y. Kovalev;M. Lister
通讯作者：
C. Chang;E. Ros;E. Ros;Y. Kovalev;Y. Kovalev;M. Lister
DOI：
10.1086/430340
发表时间：
2005-03
期刊：
The Astrophysical Journal
影响因子：
--
作者：
E. Perlman;A. Wilson
通讯作者：
E. Perlman;A. Wilson
DOI：
--
发表时间：
2005
期刊：
--
影响因子：
--
作者：
通讯作者：
--