2005年对blazar PKS0537-441的Swift和REM同步监测
Simultaneous Swift and REM monitoring of the blazar PKS0537-441 in 2005
摘要：
Blazar PKS 0537 -441在2004年底至2005年11月期间被雨燕观测到。BAT对它进行了2.7 M的周期性监测，XRT和UVOT对它进行了7次共67 K的周期性监测，使其成为雨燕监测最好的活动星系核之一。自动光学和红外望远镜REM一直在同时监测该源。在2005年1月至2月期间，PKS 0537 -441在光学和X射线中被探测到最亮：比2004年12月观测到的X射线亮2倍以上，光学亮约60倍。2005年7月的观测记录了一个较暗的X射线状态。同时光学状态，监测雨燕UVOT和REM，是高的，并在VRI波段，它是什么记录在2005年1月初，爆发之前。在2005年11月，该源在X射线和光学方面都下降到静止状态，与2005年1月至2月的爆发相比，分别下降了~4和~60倍。我们的监测显示了整体良好相关的光学和X射线衰减。在较短的时间尺度（天或小时）上，X射线和光学变化之间没有明显的相关性，但前者往往更明显，与月时间尺度上观察到的相反。在光学和X射线的长期变化的幅度大不相同是非常不寻常的，使这一观察成为一个独特的案例研究耀变体活动。的光谱能量分布的解释同步和逆康普顿机制内的射流等离子体辐射通过内部冲击和耗散取决于发射区域的距离从中央发动机（删节）。
英文摘要：
The blazar PKS0537-441 has been observed by Swift between the end of 2004 and November 2005. The BAT monitored it recurrently for a total of 2.7 Ms, and the XRT and UVOT pointed it on seven occasions for a total of 67 ks, making it one of the AGNs best monitored by Swift. The automatic optical and infrared telescope REM has monitored simultaneously the source at all times. In January-February 2005 PKS0537-441 has been detected at its brightest in optical and X-rays: more than a factor of 2 brighter in X-rays and about a factor 60 brighter in the optical than observed in December 2004. The July 2005 observation recorded a fainter X-ray state. The simultaneous optical state, monitored by both Swift UVOT and REM, is high, and in the VRI bands it is comparable to what was recorded in early January 2005, before the outburst. In November 2005, the source subsided both in X-rays and optical to a quiescent state, having decreased by factors of ~4 and ~60 with respect to the January-February 2005 outburst, respectively. Our monitoring shows an overall well correlated optical and X-ray decay. On the shorter time scales (days or hours), there is no obvious correlation between X-ray and optical variations, but the former tend to be more pronounced, opposite to what is observed on monthly time scales. The widely different amplitude of the long term variability in optical and X-rays is very unusual and makes this observation a unique case study for blazar activity. The spectral energy distributions are interpreted in terms of the synchrotron and inverse Compton mechanisms within a jet where the plasma radiates via internal shocks and the dissipation depends on the distance of the emitting region from the central engine (abridged).
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