| BL Lacertae objects and the extragalactic γ-ray background |
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| 基金项目： | Supported by the National Natural Science Foundation of China(Grant Nos. 10773020, 10821302 and 10833002); the CAS (Grant No. KJCX2-YWT03); the Science and Technology Commission of Shanghai Municipality (10XD1405000); the National Basic Research Program of China (Grant No. 2009CB824800) |
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| 摘 要： | A tight correlation between γ-ray and radio emission is found for a sample of BL Lacertae(BL Lac) objects detected by the Fermi Gamma-ray Space Telescope(Fermi) and the Energetic Gamma-Ray Experiment Telescope(EGRET) . The γ-ray emission of BL Lac objects exhibits strong variability,and the detection rate of γ-ray BL Lac objects is low,which may be related to the γ-ray duty cycle of BL Lac objects. We estimate the γ-ray duty cycle,δγ 0.11,for BL Lac objects detected by EGRET and Fermi. Using the empirical r...
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| 关 键 词： | galaxies:active — galaxies:BL Lacertae objects:general — cosmology:diffuse radiation — gamma rays:theory |
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