• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The Astrophysical journal >EVOLUTION OF THE SYNCHROTRON SPECTRUM IN MARKARIAN 421 DURING THE 1998 CAMPAIGN
【24h】

EVOLUTION OF THE SYNCHROTRON SPECTRUM IN MARKARIAN 421 DURING THE 1998 CAMPAIGN

机译：1998年竞选期间MARKARIAN 421的同步加速器光谱的演化

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The uninterrupted 7 day ASCA observations of the TeV blazar Mrk 421 in 1998 have clearly revealed that X-ray flares occur repeatedly. In this paper, we present the results of the time-resolved spectral analysis of the combined data taken by ASCA, RXTE, BeppoSAX, and the Extreme Ultraviolet Explorer (EUVE). In this object―and in many other TeV blazars―the precise measurement of the shape of the X-ray spectrum, which reflects the high-energy portion of the synchrotron component, is crucial in determining the high-energy cutoff of the accelerated electrons in the jet. Thanks to the simultaneous broadband coverage, we measured the 0.1-25 keV spectrum resolved on timescales as short as several hours, providing a great opportunity to investigate the detailed spectral evolution at the flares. By analyzing the time-subdivided observations, we parameterize the evolution of the synchrotron peak, where the radiation power dominates, by fitting the combined spectra with a quadratic form [where the vF_v flux at the energy E obeys log vF_v(E) = log (vF_v, peak) ― const (log E- log E_(peak))~2]. In this case, we show that there is an overall trend that the peak energy E_(peak) and peak flux vF_(v, peak) increase or decrease together. The relation of the two parameters is best described as E_(peak) ∝ vF_(v,peak)~(0.7) for the 1998 campaign. Similar results were derived for the 1997 observations, while the relation gave a smaller index when both 1997 and 1998 data were included. On the other hand, we show that this relation, and also the detailed spectral variations, differs from flare to flare within the 1998 campaign. We suggest that the observed features are consistent with the idea that flares are due to the appearance of a new spectral component. With the availability of the simultaneous TeV data, we also show that there exists a clear correlation between the synchrotron peak flux and the TeV flux.
机译：1998年对TeV blazar Mrk 421进行的连续7天ASCA观测清楚地表明，X射线耀斑反复发生。在本文中，我们介绍了由ASCA，RXTE，BeppoSAX和Extreme Ultraviolet Explorer（EUVE）采集的组合数据的时间分辨光谱分析结果。在这个目标中-在许多其他TeV危险中-精确测量X射线光谱的形状，反映了同步加速器组件的高能部分，对于确定加速电子中高能截止至关重要。飞机。由于同时具有宽带覆盖范围，我们测量了在短短几个小时内按时标分辨出的0.1-25 keV频谱，为研究火炬处详细的频谱演变提供了绝佳的机会。通过分析按时间细分的观测值，我们通过将组合光谱拟合为二次形式来对同步辐射峰的演化进行参数化，辐射功率占主导地位;其中能量E的vF_v通量满足log vF_v（E）= log（ vF_v，峰值）― const（log E- log E_（peak））〜2]。在这种情况下，我们显示出总体趋势是峰值能量E_（peak）和峰值通量vF_（v，peak）一起增加或减少。这两个参数之间的关系最好描述为1998年竞选活动的E_（peak）∝ vF_（v，peak）〜（0.7）。对于1997年的观测也得出了类似的结果，而当同时包含1997年和1998年的数据时，该关系给出的索引较小。另一方面，我们证明了这种关系以及详细的光谱变化在1998年的运动中因耀斑而异。我们建议观察到的特征与耀斑归因于新的光谱成分的出现是一致的。利用同步TeV数据的可用性，我们还表明，同步加速器峰值通量和TeV通量之间存在明显的相关性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号