THE OPTICAL MICROVARIABILITY AND SPECTRAL CHANGES OF THE BL LACERTAE OBJECT S5 0716+714

THE OPTICAL MICROVARIABILITY AND SPECTRAL CHANGES OF THE BL LACERTAE OBJECT S5 0716+714
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BL 蝎子物体 S5 0716 714 的光学微变性和光谱变化

DOI:
10.1088/0067-0049/185/2/511
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发表时间:
2009-10
影响因子:
8.7
通讯作者:
Fan, J. H.
Fan, J. H.
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
Poon, H.;Fu, J. N.;Fan, J. H.

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在2008年10月、12月和2009年2月期间,我们在光学波段监测了BL Lac天体S5 0716+714,在BVRI波段的最佳时间分辨率约为5分钟。四个快速耀斑的振幅范围从0.3至0.75马格南。源保持活跃,在整个监测活动,显示在所有天的微变,除了一个。总变异幅度为ΔB = 0.189,ΔV = 0.180,ΔR = 0.173,ΔI = 0.151。微变的典型时间尺度范围为2至8小时。总体V − R颜色指数范围为0.37至0.59。强烈的蓝时,更明亮的色差被发现在internight时标。然而,不同的光谱行为被发现intrinight时标。在一个晚上发现B和I带之间可能有1011分钟的时滞。喷流中的激波模型和几何效应可以用来解释源的夜内行为。
We monitored the BL Lac object S5 0716+714 in the optical band during 2008 October and December and 2009 February with a best temporal resolution of about 5 minutes in the BVRI bands. Four fast flares were observed with amplitudes ranging from 0.3 to 0.75 mag. The source remained active during the whole monitoring campaign, showing microvariability in all days except for one. The overall variability amplitudes are ΔB ∼ 0.ͫ89, ΔV ∼ 0.ͫ80, ΔR ∼ 0.ͫ73, and ΔI∼ 0.ͫ51. Typical timescales of microvariability range from 2 to 8 hr. The overall V − R color index ranges from 0.37 to 0.59. Strong bluer-when-brighter chromatism was found on internight timescales. However, a different spectral behavior was found on intranight timescales. A possible time lag of ∼11 minutes between B and I bands was found on one night. The shock-in-jet model and geometric effects can be applied to explain the source's intranight behavior.
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