2005年REM的近红外和光学多波段观测
REM near-IR and optical multiband observations of PKS2155-304 in 2005
摘要：
光谱变率是约束BL Lac天体发射模型的主要工具。通过对BL Lac原型PKS 2155-304在红外光学波段的系统观测，我们探索了月、日和小时尺度上的变化。我们用位于智利拉西拉的机器人60厘米望远镜REM进行了观测。使用VRIJHK过滤器。2005年5月至12月观察到PKS 2155-304。探索的波长间隔，测光点的总数和短的积分时间，使我们的测光大大优于以前的这个来源。强度和颜色的基础上，我们区分三种不同的状态的来源，每个持续时间的月份，其中包括所有那些在文献中描述。特别是，我们报告了有史以来在H波段检测到的最高状态。在该波段中，源的变化系数为4，远大于V波段（系数~2）。源软化与强度的增加，相反的一般模式中观察到的UV-X射线带。在11月的五个晚上，我们几乎连续监测了2-3个小时。一个时间尺度约为24小时的变率事件是有据可查的，一个更快的耀斑，t=1-2小时，也很明显，但支持的点相对较少。
英文摘要：
Spectral variability is the main tool for constraining emission models of BL Lac objects. By means of systematic observations of the BL Lac prototype PKS 2155-304 in the infrared-optical band, we explore variability on the scales of months, days and hours. We made our observations with the robotic 60 cm telescope REM located at La Silla, Chile. VRIJHK filters were used. PKS 2155-304 was observed from May to December 2005. The wavelength interval explored, the total number of photometric points and the short integration time render our photometry substantially superior to previous ones for this source. On the basis of the intensity and colour we distinguish three different states of the source, each of duration of months, which include all those described in the literature. In particular, we report the highest state ever detected in the H band. The source varied by a factor of 4 in this band, much more than in the V band (a factor ~2). The source softened with increasing intensity, contrary to the general pattern observed in the UV-X-ray bands. On five nights of November we had nearly continuous monitoring for 2-3 hours. A variability episode with a time scale of ~24 h is well documented, a much more rapid flare with t=1-2 h, is also apparent, but is supported by relatively few points.
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