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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Bright X-ray flares from the BL Lac object Markarian 421, detected with MAXI in 2010 January and February
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Bright X-ray flares from the BL Lac object Markarian 421, detected with MAXI in 2010 January and February

机译：来自BL Lac物体Markarian 421的明亮X射线耀斑，于2010年1月和2月用MAXI检测到

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Strong X-ray flares from the blazar Mrk 421 were detected in 2010 January and February through 7-month monitoring with the MAXI GSC. The maximum 2-10 keV flux in the January and February flares was measured to be 120± 10mCrab and 164± 17mCrab, respectively; the latter is the highest among those reported from the object. A comparison of the MAXI and Swift BAT data suggests a convex X-ray spectrum with an approximated photon index of F ? 2. This spectrum is consistent with a picture that MAXI is observing near the synchrotron peak frequency. The source exhibited a spectral variation during these flares, slightly different from those in previous observations, in which the positive correlation between the flux and hardness was widely reported. By equating the halving decay timescale in the January flare, t_d ～ 2.5 × 10~4 s, to the synchrotron cooling time, the magnetic field was evaluated to be B ～ 4.5 × 10~(-2)G (?=10)δ 1=3, where ? is the jet beaming factor. Assuming that the light crossing time of the emission region is shorter than the doubling rise time, t_r. 2 × 10~4 s, the region size was roughly estimated as R < 6 × 10~(15)cm (δ =10). These results are consistent with values previously reported. For the February flare, the rise time, tr < 1.3 × 10~5 s, gives a loose upper limit on the size asR< 4 × 10~(16)cm.δ =10/, although the longer decay time, t _d ～ 1.4 × 10~5 s, indicates B ～ 1.5 × 10~(-2)G (δ =10)~(-1/3), which is weaker than the previous results. This could be reconciled by invoking a scenario that this flare is a superposition of unresolved events with a shorter timescale.
机译：在2010年1月和2月，通过MAXI GSC进行了为期7个月的监测，发现了来自Blazar Mrk 421的强烈X射线耀斑。一月和二月耀斑的最大2-10 keV通量分别为120±10mCrab和164±17mCrab。后者是该对象报告的最高值。对MAXI和Swift BAT数据的比较表明，X射线光谱呈凸形，光子指数近似为F？。 2.该频谱与MAXI在同步加速器峰值频率附近观察到的图像一致。该源在这些耀斑中表现出光谱变化，与以前的观测结果略有不同，在先前的观测中，广泛报道了通量和硬度之间的正相关关系。通过将一月耀斑的减半衰变时间刻度t_d〜2.5×10〜4 s等于同步加速器冷却时间，磁场被评估为B〜4.5×10〜（-2）G（？= 10）δ 1 = 3，在哪里？是射流辐射系数。假设发射区域的光穿越时间短于两倍的上升时间t_r。 2×10〜4 s，区域大小粗略估计为R <6×10〜（15）cm（δ= 10）。这些结果与先前报道的值一致。对于二月耀斑，上升时间tr <1.3×10〜5 s给出了一个宽松的上限，即R <4×10〜（16）cm.δ= 10 /，尽管更长的衰减时间t _d 〜1.4×10〜5 s，表示B〜1.5×10〜（-2）G（δ= 10）〜（-1/3），比以前的结果弱。可以通过调用一个方案来解决此问题，即这种耀斑是未解决事件的叠加，时间较短。

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