CONSTRAINTS ON THE MINIMUM ELECTRON LORENTZ FACTOR AND MATTER CONTENT OF JETS FOR A SAMPLE OF BRIGHT FERMI BLAZARS
CONSTRAINTS ON THE MINIMUM ELECTRON LORENTZ FACTOR AND MATTER CONTENT OF JETS FOR A SAMPLE OF BRIGHT FERMI BLAZARS
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DOI：
10.1088/0067-0049/215/1/5
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发表时间：
2014-09
期刊：
影响因子：
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通讯作者：
Shi-Ju Kang;L. Chen;Qingwen Wu
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文献类型：
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作者：
Shi-Ju Kang;L. Chen;Qingwen Wu
我们拟合（准）同时多波段光谱能量分布的低同步加速器峰值（LSP）的样品与单区轻子模型。种子光子，主要来自宽线区（BLR）和红外（IR）分子环面被认为是在外部康普顿过程的上下文中。我们发现，基于χ2检验，使用IR种子光子的建模在系统上优于使用BLR光子的建模，这表明γ射线发射区域最有可能在BLR之外被发现。最小电子洛伦兹因子γmin是由这些具有良好软X射线数据的LSP blazar的模型约束的（范围从5到160，中值为55），其在喷流功率估计中起关键作用。假设质子与电子的比例为一比一，我们发现LSP耀变体的喷流功率在151 MHz的射电光度L151 MHz处系统地高于FR II射电星系，尽管FR II在统一方案中被视为与LSP耀变体相同，但喷流视角除外。一个可能的原因是这些耀变体的喷流中存在一些e±对。如果是这样的话，我们发现，假设在给定的L151 MHz下，LSP blazar和FR II的喷流功率相同，那么e±对的数密度应该比e−-p对的数密度高几倍。
We fit (quasi-)simultaneous multi-waveband spectral energy distributions for a sample of low-synchrotron-peaked (LSP) blazars with a one-zone leptonic model. The seed photons that predominantly come from the broad line region (BLR) and infrared (IR) molecular torus are considered in the context of an external Compton process. We find that modeling with IR seed photons is systematically better than that with BLR photons based on a χ2 test, which suggests that γ-ray-emitting regions are most likely found outside the BLR. The minimum electron Lorentz factor, γmin, is constrained from the modeling of these LSP blazars with good soft X-ray data (ranging from 5 to 160 with a median value of 55), which plays a key role in jet power estimation. Assuming a one-to-one ratio of protons to electrons, we find that the jet power for LSP blazars is systematically higher than that of FR II radio galaxies at a 151 MHz radio luminosity, L151 MHz even though FR IIs are regarded as the same as LSP blazars in a unification scheme except at the jet viewing angle. A possible reason for this is that there are some e± pairs in the jets of these blazars. If this is the case, we find that the number density of e± pairs should be several times higher than that of e−–p pairs by assuming the jet power is the same for LSP blazars and FR IIs at the given L151 MHz.