摘 要：在非均勻錐形噴流模型中，電子密度、磁場強(qiáng)度隨著到噴流頂點(diǎn)的距離呈冪率分布。該模型能成功解釋活動星系核噴流核心區(qū)域的平譜射電輻射，但已有的模型計算只適用于噴流運(yùn)動方向與視線夾角很大的情況。該文給出了適用于任何視角情況的非均勻錐形噴流輻射計算公式，并利用數(shù)值計算方法計算了噴流的輻射譜。普遍認(rèn)為BL Lac天體中噴流的運(yùn)動方向與視線夾角很小，我們利用非均勻噴流模型擬合了3個BL Lac天體的射電觀測譜，確定了它們噴流中電子密度，磁場強(qiáng)度等物理參數(shù)。我們的研究表明觀測輻射譜拐折頻率確定出錐形噴流離黑洞最近距離，對于這3個BL Lac天體，我們發(fā)現(xiàn)它們的錐形噴流離黑洞最近距離約為：Schwarzschild半徑。

關(guān)鍵詞：星系 類星體 黑洞

Abstract： Konigl proposed an inhomogeneous jet model， in which the jet is assumed to have a conical geometry， that is， the velocity with which the jet is expanding sideways， is constant.We reconsider this jet model with assumptions and simplifications as few as possible and including more detailed considerations such as the difference of Doppler factor of each section of jet and the small viewing angle cases in BL Lacertae objects. We then apply our model to three BL Lacertae objects， fitted their spectrum energy distribution and derived the physical parameters of jets. We also calculate the kinetic energy and magnetic energy in jets of these three BL Lacertae objects and found that at pc scale the kinetic power dominant over magnetic power， indicating that the effective transfer efficiency from magnetic energy to kinetic energy

Key Words： Galaxy； Quasar； Black Hole

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