Recent progress of solar physics research in China     

Cheng Fang School of Astronomy  Space Science  Nanjing University  Nanjing  China  Key Laboratory of Modern Astronomy  Astrophysics  Ministry of Education 《中国天文和天体物理学报》2011,(12)

Owing to the largely improved facilities and working conditions,solar physics research in China has recently shown marked development.This paper reports on the recent progress of solar physics research in Mainland China,mainly focusing on several hot issues,including instrumentations,magnetic field observations and research,solar flares,filaments and their eruptions,coronal mass ejections and related processes,as well as active regions and the corona,small-scale phenomena,solar activity and its predictions....  相似文献   

The relationship between the radio core dominance parameter and the spectral index in different classes of extragalactic radio sources     

Jun-Hui Fan    Jiang-He Yang    Jing Pan  Tong-Xu Hua  Center for Astrophysics  Guangzhou University  Guangzhou  China  Astronomy Science  Technology Research Laboratory of 《中国天文和天体物理学报》2011,(12)

Active galactic nuclei(AGNs)have two major classes,namely radio loud AGNs and radio quiet AGNs.A small subset of the radio-loud AGNs is called blazars,which display extreme observational properties,such as rapid variability,high luminosity,high and variable polarization,and superluminal motion.All of those observational properties are probably due to a relativistic beaming effect with the jet pointing close to the line of sight.Observations suggest that the orientation can be expressed by a core-dominance p...  相似文献   

BL Lacertae objects and the extragalactic γ-ray background     

Fan Li  Xin-Wu Cao Key Laboratory for Research in Galaxies  Cosmology  Shanghai Astronomical Observatory  Chinese Academy of Sciences  Shanghai  China Graduate University of Chinese Academy of Sciences  Beijing  China 《中国天文和天体物理学报》2011,(8)

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...  相似文献