本文選題：星系　切入點(diǎn)：活動(dòng)　出處：《天文學(xué)報(bào)》2013年03期 　論文類型：期刊論文

【摘要】：在非均勻錐形噴流模型中,電子數(shù)密度、磁場(chǎng)強(qiáng)度隨著到噴流頂點(diǎn)的距離呈冪律分布.該模型能成功解釋活動(dòng)星系核噴流核心區(qū)域的平譜射電輻射,但已有的模型計(jì)算只適用于噴流運(yùn)動(dòng)方向與視線夾角很大的情況,所以需要建立適用于任何視角情況的非均勻錐形噴流輻射計(jì)算公式.普遍認(rèn)為BL Lac天體中噴流的運(yùn)動(dòng)方向與視線夾角很小,推廣后的非均勻噴流模型擬合了3個(gè)BL Lac天體的射電觀測(cè)譜,確定了它們噴流中電子數(shù)密度、磁場(chǎng)強(qiáng)度等物理參數(shù).研究結(jié)果表明觀測(cè)輻射譜拐折頻率確定出錐形噴流離黑洞最近距離,對(duì)于這3個(gè)BL Lac天體,它們的錐形噴流離黑洞最近距離約為Schwarzschild半徑.
[Abstract]:In the inhomogeneous conical jet model, the electron number density and magnetic field intensity show a power law distribution with the distance from the top of the jet. The model can successfully explain the flat-spectrum radio radiation in the core region of the active galactic nucleus jet. However, the existing model can only be used in the case of a large angle between the direction of the jet and the line of sight. So it is necessary to establish a formula for calculating the inhomogeneous conical jet radiation suitable for any angle of view. It is generally believed that the angle between the direction of motion and the line of sight of the jet in BL Lac celestial bodies is very small. The radio observation spectra of three BL Lac objects were fitted by the generalized non-uniform jet model, and the electron number density in the jet was determined. The results show that the nearest distance of the conical jet from the black hole is determined by the observed radiation spectrum turning frequency, and for the three BL Lac objects, their closest distance from the black hole is about the Schwarzschild radius.
【作者單位】： 中國(guó)科學(xué)院上海天文臺(tái);中國(guó)科學(xué)院大學(xué);
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(10773021,10833005),國(guó)家自然科學(xué)基金創(chuàng)新研究群體項(xiàng)目(10821302) 973項(xiàng)目(2007CB815402/403)資助
【分類號(hào)】：P157.7
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本文編號(hào)：1586877