Energy densities of magnetic field and relativistic electrons at the inner most region of the M87 jet
Energy densities of magnetic field and relativistic electrons at the inner most region of the M87 jet
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M87射流最内部区域的磁场和相对论电子的能量密度
DOI：
10.1051/epjconf/20136101009
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
A.
中科院分区：
文献类型：
--
作者：
Kino;M.;Takahara;F.;Hada;K.;Doi;A.
我们研究了M87喷流中磁场和相对论电子的能量密度。由于M87喷流底部的射电核心是防止同步加速器自吸收（SSA）的光学厚表面，观测直接给出了SSA的大小和周转频率。利用观测到的角直径0.11 mas（相当于6 × 109太阳质量的中心黑洞的16个Schwarzschild半径）和射电核在43 GHz处的通量密度，通过与观测到的射电核的比较，用标准SSA公式估算了磁场和相对论电子的能量密度.结合M87喷气发动机允许的总动能，我们发现：（i）允许的B限制在2 G ≤B≤ 13 G的范围内，（ii）0：18 ≤Ue/UB≤ 66成立。我们的结果对活动星系核中相对论性喷流的形成机制具有重要的约束作用。
We explore energy densities of magnetic fields and relativistic electrons in M87 jet. Since the radio core at the base of the M87 jet is the optically thick surface against synchrotron self absorption (SSA), observations directly give the size and turnover frequency for SSA. Using the observed angular diameter 0.11 mas, which corresponds to 16 Schwarzschild radii of the central black hole with 6 × 109solar mass, and the flux density of the radio core at 43 GHz, we estimate the energy densities of magnetic field (UB) and relativistic electrons (Ue) by comparing the standard SSA formula to the observed radio core. Together with the allowed total kinetic power of the M87 jet, we find that (i) the allowedBis limited in the range 2 G ≤B≤ 13 G, and that (ii) 0:18 ≤Ue/UB≤ 66 holds. Our results significantly constrain formation mechanism of relativistic jets in active galactic nuclei.