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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >A study of the long-term spectral variations of 3C 66A observed with the Fermi and Kanata telescopes
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A study of the long-term spectral variations of 3C 66A observed with the Fermi and Kanata telescopes

机译：用费米望远镜和卡纳塔望远镜观测的3C 66A长期光谱变化的研究

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3C 66A is an intermediate-frequency-peaked BL Lac object detected by the Large Area Telescope onboard the Fermi Gamma-ray Space Telescope. We present a study of the long-term variations of this blazar seen over ~2yr at GeV energies with Fermi and in the optical (flux and polarization) and near infrared with the Kanata telescope. In 2008, the first year of the study, we find a correlation between the gamma-ray flux and the measurements taken with the Kanata telescope. This is in contrast to the later measurements performed during 2009-2010 which show only a weak correlation along with a gradual increase of the optical flux. We calculate an external seed photon energy density assuming that the gamma-ray emission is due to external Compton scattering. The energy density of the external photons is found to be higher by a factor of two in 2008 compared to 2009-2010. We conclude that the different behaviors observed between the first year and the later years might be explained by postulating two different emission components.
机译：3C 66A是费米伽马射线太空望远镜上的大面积望远镜探测到的中频峰值BL Lac对象。我们提出了一项研究，用费米（Fermi）在GeV能量下和在近2年内用kanata望远镜在光学（通量和极化）和近红外下观察到这种blazar的长期变化。在研究的第一年2008年，我们发现了伽马射线通量和Kanata望远镜进行的测量之间的相关性。这与2009-2010年期间进行的后续测量相反，后者仅显示出弱的相关性，并且光通量逐渐增加。我们假设γ射线的发射是由于外部康普顿散射而产生的，则计算了外部种子光子的能量密度。发现外部光子的能量密度在2008年比2009-2010年高出两倍。我们得出的结论是，第一年和第二年之间观察到的不同行为可以通过假设两个不同的排放成分来解释。

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