Blazar sequence – an artefact of Doppler boosting
Blazar sequence – an artefact of Doppler boosting
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DOI：
10.1051/0004-6361:200809716
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发表时间：
2008-03
影响因子：
6.5
通讯作者：
E. Nieppola;E. Valtaoja;M. Tornikoski;T. Hovatta;M. Kotiranta
中科院分区：
文献类型：
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作者：
E. Nieppola;E. Valtaoja;M. Tornikoski;T. Hovatta;M. Kotiranta
上下文耀变体序列是耀变体的热光度决定其光谱能量分布的一种情况。最突出的结果是显着的负相关的同步峰值频率和同步峰值光度的耀变体人口。目标。一般来说，对耀变体序列的观测研究忽略了多普勒增强的影响。我们研究了同步辐射峰值频率和亮度与多普勒校正量的关系。方法.我们确定了135个射电亮活动星系核的光谱能量分布，并找到了最佳拟合的抛物线函数的分布，以量化他们的同步辐射。同步辐射峰值亮度和频率的相应测量多普勒校正与一组新的多普勒因子计算的变异性数据。blazar序列的相关性确定这些内在的量。结果多普勒因子强烈地依赖于同步加速器峰值频率，较低的能量源被更多地提升。对峰值频率和亮度应用多普勒校正取消了这两个量之间的负相关性，使其变为正相关。对于BL Lacertae天体，正相关性特别强。结论. blazar序列，当定义为峰值频率和光谱能量分布的同步分量的亮度之间的关系时，消失时，使用固有的多普勒校正值。它是一种观测现象，由同步加速器峰值频率范围内的可变多普勒增强产生。
Context. The blazar sequence is a scenario in which the bolometric luminosity of the blazar governs the appearance of its spectral energy distribution. The most prominent result is the significant negative correlation between the synchrotron peak frequencies and the synchrotron peak luminosities of the blazar population. Aims. Observational studies of the blazar sequence have, in general, neglected the effect of Doppler boosting. We study the dependence of both the synchrotron peak frequency and luminosity with Doppler-corrected quantities. Methods. We determine the spectral energy distributions of 135 radio-bright AGN and find the best-fit parabolic function for the distribution to quantify their synchrotron emission. The corresponding measurements of synchrotron peak luminosities and frequencies are Doppler-corrected with a new set of Doppler factors calculated from variability data. The relevant correlations for the blazar sequence are determined for these intrinsic quantities. Results. The Doppler factor depends strongly on the synchrotron peak frequency, the lower energy sources being more boosted. Applying the Doppler correction to the peak frequencies and luminosities annuls the negative correlation between the two quantities, which becomes positive . For BL Lacertae objects, the positive correlation is particularly strong. Conclusions. The blazar sequence, when defined as the anticorrelation between the peak frequency and luminosity of the synchrotron component of the spectral energy distribution, disappears when the intrinsic, Doppler-corrected values are used. It is an observational phenomenon created by variable Doppler boosting across the synchrotron peak frequency range.