Blazars伽玛射线辐射的EC模型检验
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摘要
本文主要以Fermi-LAT巡天所探测到的blazars为样本,通过分析多普勒因子与伽玛射线流量和同步辐射流量比值间的相关性,以及计算blazars中央黑洞质量,分析中央黑洞质量与伽玛辐射光度和同步辐射光度比值之间的相关性来研究blazars的伽玛射线辐射机制。
     伽玛射线辐射和不同波段(如光学、红外和射电)辐射之间的关系可能提供伽玛射线辐射机制的线索。喷流内的相对论电子通过逆康普顿散射软光子产生伽玛射线。假设软光子来源于喷流之外,多普勒因子与伽玛流量和同步辐射流量比值之间有相关性:如果软光子来源于喷流之内的同步辐射,则该相关性不存在。我们对一样本进行了研究,分析了多普勒因子与伽玛流量和同步辐射流量比值间的关系。结果显示,在光学、近红外处,关系为强相关,支持了EC模型。表明样本中blazars伽玛射线辐射产生过程中的软光子来源于外辐射场。
     在AGN统一模型所描述的结构图像中,星系中心黑洞的质量在106-1010M。,从样本的计算结果来看,黑洞质量范围在107-1010M。,与模型的描述相符合。黑洞质量与伽玛射线光度、伽玛光度和近红外光度比值之间均存在相关性。我们假设blob半径正比于黑洞质量,从这个角度考虑,逆康普顿过程散射的软光子可能来源于SSC过程。
In this thesis, based on the data of Blazars observed by Fermi-LAT telescope, we present the studies of the high energetic gamma-ray radiative mechanism of blazars, including analyzing the relations between the Doppler factor and the ratio of gamma-ray flux to the synchrotron flux, calculating the mass of black hole, and analyzing the relations between the mass of black hole and the ratio of gamma-ray luminosity to the synchrotron luminosity etc.
     The relations between y-ray emission and emission in different wavebands, such as optical, infrared and radio bands, may provide clues on the radiative mechanism for y-ray emission. The relativistic electron inverse Compton scatter photon to gamma-ray in blob frame. Assuming that the seed photons are produced externally to the jet, one can predict a correlation between the doppler factor and the ratio of the y-ray flux to the synchrotron radiation flux is related. If the seed photon produced by SSC, the cor-relation is not existed. We choose a Fermi-LAT Blazars sample, present the correlation between the doppler factor and the ratio of gamma flux to synchrotron flux. The results are that the correlations are strong at optical and infrared. It is in good agreement with the model predictions and implies that the soft photons may be dominated from the BLRs.
     There is a supermassive black hole in the center of AGN. The black hole accretes galactic matter and generate energy. Mass of black hole are106-1010Mo in the unified models of AGN. From the results calculated from our samples, mass of black hole are107-1010Mo. It is good in agreement with the model. The relations between the mass and the gamma-ray luminosity, the ratio of gamma luminosity to the infrared flux are found. We assume that the relation between the radius of blob and the black hole mass are direct proportion. It suggests that the soft photons may be from SSC in this perspective.
引文
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