费米时代黎明时的TeV BL Lac天体
TeV BL Lac objects at the dawn of the Fermi era
摘要：
我们重新考虑的BL Lac对象发射的高能伽马射线波段利用新的信息在MeV-GeV波段的费米伽马射线太空望远镜（LAT）板载在其头三个月的操作中获得的发射特性。为了这个目的，我们构建的光谱能量分布的所有BL Lacs揭示的LAT和已知的TeV BL Lacs没有检测到LAT，还包括数据从雨燕卫星，并与一个简单的单区轻子模型模型。分析表明，由LAT检测到的BL Lacs（在TeV波段中检测到或尚未检测到）具有相似的物理参数。虽然一些TeV BL Lac没有被LAT发现的光谱能量分布和物理参数与LAT BL Lac非常相似，但一组物体显示出特殊的性质（较大的电子能量和较小的磁场），表明发射区的物理条件不同。最后，我们讨论了可能的标准，以有效地选择良好的新候选人的切伦科夫望远镜之间的LAT源，提出了一个列表中的预测通量计算的非常高的能量带，包括河外背景光的吸收的影响。
英文摘要：
We reconsider the emission properties of the BL Lac objects emitting in the high-energy gamma-ray band exploiting the new information in the MeV-GeV band obtained by the Large Area Telescope (LAT) onboard the Fermi Gamma-Ray Space Telescope in its first three months of operation. To this aim we construct the spectral energy distribution of all the BL Lacs revealed by LAT and of the known TeV BL Lacs not detected by LAT, also including data from the Swift satellite, and model them with a simple one-zone leptonic model. The analysis shows that the BL Lacs detected by LAT (being or not already detected in the TeV band) share similar physical parameters. While some of the TeV BL Lacs not revealed by LAT have spectral energy distributions and physical parameters very similar to the LAT BL Lacs, a group of objects displays peculiar properties (larger electron energies and smaller magnetic fields) suggesting different physical conditions in the emission region. Finally, we discuss possible criteria to effectively select good new candidates for the Cherenkov telescopes among the LAT sources, presenting a list of predicted fluxes in the very high-energy band calculated including the effect of the absorption by the extragalactic background light.
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