A Study of the γ-ray and X-ray Radiations of BL Lac Objects |
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Authors: | Hao-jing Zhang Xiong Zhang |
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Institution: | 1 National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012;2 Graduate School of Chinese Academy of Sciences, Beijing 100049;3 Department of Physics, Yunnan Normal University, Kunmimg 650092 |
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Abstract: | The X-ray and γ-ray flux densities of 18 γ-loud BL Lac objects as well as their average spectral indices of X-ray wave band (1 keV) and γ-ray wave band (>100 MeV) are collected, and the correlations among the various quantities are examined. The results indicate: (1) The X-ray flux density and the γ-ray flux density exhibit rather strong correlations in all the states, high, low or mediate. (2) Between the mean spectral indices in X-ray and γ-ray wave bands there is a comparatively intense anti-correlation. (3) Between the average spectral indices and the X-ray and γ- flux densities there is no evident correlation either in the high or the mediate state. (4) Between the average spectral index of γ-ray wave band and the flux density of X-rays in low state there is a rather strong anticorrelation. Between the mean spectral index of X-ray wave band and the γ-flux density in low state there also exists a weak correlation. The results of our analysis support the viewpoint that both the X-ray and γ-ray emissions of BL Lac objects come from the synchrotron radiation and synchrotron self Compton (SSC) radiation with one and the same distribution of relativistic electrons. |
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Keywords: | Galaxies: active BL Lacertae objects: general γ-ray: theoretical X-ray: galaxies Method: data analysis |
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