SIX-YEAR OPTICAL MONITORING OF THE BL LACERTAE OBJECT 1ES 0806+52.4
SIX-YEAR OPTICAL MONITORING OF THE BL LACERTAE OBJECT 1ES 0806+52.4
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DOI：
10.1088/0004-6256/148/6/110
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发表时间：
2014-08
期刊：
影响因子：
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通讯作者：
Z. Man;Xiaoyuan Zhang;Jianghua Wu;Xu Zhou;Q. Yuan
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文献类型：
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作者：
Z. Man;Xiaoyuan Zhang;Jianghua Wu;Xu Zhou;Q. Yuan
本文报道了对BL Lacertae天体1ES 0806+52.4的首次系统长期多色光学监测结果。从2005年12月到2011年2月，使用60/90 cm施密特望远镜在多个波段进行监测。从2005年12月到2008年12月，这个天体的整体亮度下降，但在那之后又恢复了。一次剧烈的爆发可能发生在我们的监测项目快结束的时候。与长期趋势重叠的是一些短期的小振幅振荡。与2005年之前的历史观测结果一致，该天体未发现夜间变异性。通过研究颜色行为，我们发现1ES 0806+52.4的长期变异性具有强烈的越亮越蓝的色度。c、i和o波段的总振幅分别为1.18、1.12和1.02等。振幅倾向于向短波长方向增加，这可能是色度越亮越蓝的主要原因。这种偏蓝偏亮的色度在其他耀变体中也有发现，比如S5 0716+714、OJ 287。从Swift/BAT档案中收集的硬x射线数据与我们的光学数据相关联。没有发现积极的结果，原因可能是在轻子同步加速器自康普顿模型下，硬x射线通量是同步加速器和逆康普顿发射的结合，但具有不同的时间尺度和节奏。
We present the results of the first systematic long-term multicolor optical monitoring of the BL Lacertae object 1ES 0806+52.4. The monitoring was performed in multiple passbands with a 60/90 cm Schmidt telescope from 2005 December to 2011 February. The overall brightness of this object decreased from 2005 December to 2008 December but was regained after that. A sharp outburst probably occurred around the end of our monitoring program. Overlapping the long-term trend are some short-term small-amplitude oscillations. No intranight variability was found in the object, which is in accordance with the historical observations before 2005. By investigating the color behavior, we found a strong bluer-when-brighter chromatism for the long-term variability of 1ES 0806+52.4. The total amplitudes at the c, i, and o bands are 1.18, 1.12, and 1.02 mag, respectively. The amplitudes tend to increase toward shorter wavelengths, which may be a major cause of the bluer-when-brighter chromatism. Such bluer-when-brighter chromatisms are also found in other blazars, such as S5 0716+714, OJ 287. The hard-X-ray data collected from the Swift/BAT archive was correlated with our optical data. No positive result was found, the reason for which may be that the hard-X-ray flux is a combination of the synchrotron and inverse Compton emission, but with different timescales and cadences under the leptonic synchrotron self-Compton model.