The intrinsic γ-ray emissions of Fermi blazars

发布时间：2018-06-24 07:53

  本文选题：galaxies + active　； 参考：《Research in Astronomy and Astrophysics》2017年07期

【摘要】：The beaming effect is important for understanding the observational properties of blazars.In this work, we collect 91 Fermi blazars with available radio Doppler factors. γ-ray Doppler factors are estimated and compared with radio Doppler factors for some sources. The intrinsic(de-beamed)γ-ray flux density(f_γ~(in)), intrinsic γ-ray luminosity(L_γ~(in)) and intrinsic synchrotron peak frequency(V_P~(in))are calculated. Then we study the correlations between finγand redshift and find that they follow the theoretical relation: log f =-2.0 log z + const. When the subclasses are considered, we find that stationary jets are perhaps dominant in low synchrotron peaked blazars. Sixty-three Fermi blazars with both available short variability time scales(?T) and Doppler factors are also collected. We find that the intrinsic relationship between L_γ~(in) and ?Tinobeys the Elliot Shapiro and Abramowicz Nobili relations. Strong positive correlation between f_γ~(in)and V_P~(in)is found, suggesting that synchrotron emissions are highly correlated with γ-ray emissions.
[Abstract]:The beaming effect is important for understanding the observational properties of blazars.In this work, we collect 91 Fermi blazars with available radio Doppler factors. 纬-ray Doppler factors are estimated and compared with radio Doppler factors for some sources. The intrinsic(de-beamed)纬-ray flux density(f_纬~(in)), intrinsic 纬-ray luminosity(L_纬~(in)) and intrinsic synchrotron peak frequency(V_P~(in))are calculated. Then we study the correlations between fin纬and redshift and find that they follow the theoretical relation: log f =-2.0 log z + const. When the subclasses are considered, we find that stationary jets are perhaps dominant in low synchrotron peaked blazars. Sixty-three Fermi blazars with both available short variability time scales(?T) and Doppler factors are also collected. We find that the intrinsic relationship between L_纬~(in) and ?Tinobeys the Elliot Shapiro and Abramowicz Nobili relations. Strong positive correlation between f_纬~(in)and V_P~(in)is found, suggesting that synchrotron emissions are highly correlated with 纬-ray emissions.
【作者单位】： Center
【基金】：supported by the National Natural Science Foundation of China (Grant Nos. U1531245, U1431112, 11203007, 11403006, 10633010, 11173009 and 11403006) the Innovation Foundation of Guangzhou University (IFGZ) Guangdong Innovation Team (2014KCXTD014) Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme (GDUPS) (2009) Yangcheng Scholar Funded Scheme (10A027S) support for Astrophysics Key Subjects of Guangdong Province and Guangzhou City
【分类号】：P157.6;P172.3

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