论文标题
进攻弹磁力作为重复FRB 180916的来源。J0158+65
Precessing flaring magnetar as a source of repeating FRB 180916.J0158+65
论文作者
论文摘要
最近，Chime检测到重复FRB 180916.J0158+65的爆发速率的周期性。在流行的一类模型中，快速无线电爆发（FRB）是由由芯中的快速双极扩散驱动的超活动磁场的巨型磁力产生的。我们指出，在这种情况下，磁铁有望在数小时至几周的时间内自由预言。内部磁场$ b \ sim 10^{16} $ g变形了恒星，磁力会引起磁应力突然变化。惯性的主要轴的产生扭矩和位移能够泵送显着的进动幅度。燃烧的FRB活性的各向异性与进动相结合，暗示着可见的爆发速率的强烈调节。磁铁模型中调用的超强场提供：（1）频繁的巨型耀斑的能量，（2）高双极性扩散率的高速率，在时间尺度上释放磁能$ \ sim 10^9 $ s，（3）核心温度$ t \ t \ t \ t \ t \ t \ t \ t \ t \ t \ t \ t \ t \ t \ t \ t \ t \ t \ 10^9 $ a，可能是高于中子的高度启动，效率为4）。 （5）用椭圆度$ε> 10^{ - 6} $变形，比旋转变形大得多。这些条件会导致粘液阻尼可忽略不计，可以解释在FRB 180916.J0158+65中观察到的16天。
Recently, CHIME detected periodicity in the bursting rate of the repeating FRB 180916.J0158+65. In a popular class of models, the fast radio bursts (FRBs) are created by giant magnetic flares of a hyper-active magnetar driven by fast ambipolar diffusion in the core. We point out that in this scenario the magnetar is expected to precess freely with a period of hours to weeks. The internal magnetic field $B\sim 10^{16}$G deforms the star, and magnetic flares induce sudden changes in magnetic stresses. The resulting torques and displacements of the principal axes of inertia are capable of pumping a significant amplitude of precession. The anisotropy of the flaring FRB activity, combined with precession, implies a strong periodic modulation of the visible bursting rate. The ultra-strong field invoked in the magnetar model provides: (1) energy for the frequent giant flares, (2) the high rate of ambipolar diffusion, releasing the magnetic energy on the timescale $\sim 10^9$s, (3) the core temperature $T\approx 10^9$K, likely above the critical temperature for neutron superfluidity, (4) strong magnetospheric torques, which efficiently spin down the star, and (5) deformation with ellipticity $ε> 10^{-6}$, much greater than the rotational deformation. These conditions result in a precession with negligible viscous damping, and can explain the observed 16 day period in FRB 180916.J0158+65.
