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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Suzaku and Multi-Wavelength Observations of OJ 287 during the Periodic Optical Outburst in 2007
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Suzaku and Multi-Wavelength Observations of OJ 287 during the Periodic Optical Outburst in 2007

机译：2007年周期性光爆发期间朱雀和OJ 287的多波长观测

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Suzaku observations of the blazar OJ 287 were performed in 2007 April 10-13 and November 7-9. They correspond to a quiescent and a flaring state, respectively. The X-ray spectra of the source can be well-described with single power-law models in both exposures. The derived X-ray photon index and the flux density at 1 keV were found to be F = 1.65 ± 0.02 and Si keV = 215 ± 5 nJy in the quiescent state. In the flaring state, the source exhibited a harder X-ray spectrum (F = 1.50 ± 0.01) with a nearly doubled X-ray flux density of S_(1 keV) = 404_(-5)~(+6)nJy. Moreover, significant hard X-ray signals were detected up to 27 keV. In cooperation with Suzaku, simultaneous radio, optical, and very-high-energy γ -ray observations of OJ 287 were performed with the Nobeyama Millimeter Array, the KANATA telescope, and the MAGIC telescope, respectively. The radio and optical fluxes in the flaring state (3.04 ± 0.46 Jy and 8.93 ± 0.05 mJy at 86.75 Hz and in the V-band, respectively) were found to be higher by a factor of 2-3 than those in the quiescent state (1.73 ± 0.26 Jy and 3.03 ± 0.01 mJy at 86.75 Hz and in the V -band, respectively). No notable y -ray events were detected in either observation. The spectral energy distribution of OJ 287 indicated that the X-ray spectrum was dominated by inverse Compton radiation in both observations, while synchrotron radiation exhibited a spectral cutoff at around the optical frequency. Furthermore, no significant difference in the synchrotron cutoff frequency was found between the quiescent and flaring states. According to a simple synchrotron self-Compton model, the change of the spectral energy distribution is due to an increase in the energy density of electrons with small changes of both the magnetic field strength and the maximum Lorentz factor of electrons.
机译：朱雀对blazar OJ 287的观测是在2007年4月10日至13日和11月7日至9日进行的。它们分别对应于静态和扩口状态。光源的X射线光谱可以用两次曝光中的单个幂律模型很好地描述。在静态下，得出的X射线光子指数和1 keV处的通量密度为F = 1.65±0.02和Si keV = 215±5 nJy。在张开状态下，放射源显示出较硬的X射线光谱（F = 1.50±0.01），其X射线通量密度几乎翻倍为S_（1 keV）= 404 _（-5）〜（+6）nJy。此外，检测到高达27 keV的重要硬X射线信号。与朱雀学合作，分别用野部山毫米波阵列，kanata望远镜和MAGIC望远镜同时进行了OJ 287的无线电，光学和超高能γ射线观测。发现在张开状态下的无线电通量和光通量（分别在86.75 Hz和V波段下为3.04±0.46 Jy和8.93±0.05 mJy）比静止状态下的高2-3倍（在86.75 Hz和V波段分别为1.73±0.26 Jy和3.03±0.01 mJy）。在任一观察中均未检测到明显的y射线事件。 OJ 287的光谱能量分布表明，在两个观察结果中，X射线光谱均以逆康普顿辐射为主，而同步加速器辐射在光频率附近表现出光谱截止。此外，在静止状态和扩口状态之间，同步加速器的截止频率没有显着差异。根据一个简单的同步加速器自康普顿模型，光谱能量分布的变化是由于电子的能量密度增加，而磁场强度和电子的最大洛伦兹因子变化很小。

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