论文标题

单元环中PSR B0656+14的星际闪烁和极化

Interstellar scintillation and polarization of PSR B0656+14 in the Monogem Ring

论文作者

Yao, Jumei, Coles, William A., Manchester, Richard N., Stinebring, Daniel R., Kramer, Michael, Wang, Na, Li, Di, Zhu, Weiwei, Feng, Yi, Yuan, Jianping, Wang, Pei

论文摘要

使用五百米的光圈球形射电望远镜(FAST)在一年内以三个时期制造的PSR〜B0656+14的高灵敏度星际闪烁和极化观测结果表明,散射由两个不同的紧凑型区域支配。我们用单元环的外壳确定了靠近脉冲星的一个,从而确认了关联。另一个可能与当地气泡有关。我们发现,观察到的脉冲星旋转轴的位置角和空间速度显着不同,分隔为$ 19 \ fdg3 \ pm $ 0 \ fdg8,与先前发布的近乎完美的对齐不一致的$ 1 \ degr \ degr \ pm 2 \ degr $不一致。在次级光谱中明确定义了两个独立的散射区域,该光谱显示了两个强的前向抛物线弧。弧曲率表明,与外部和内部弧相对应的散射屏幕分别位于psr B0656+14和185〜PC的大约28〜PC,分别来自地球。观察到的多普勒轮廓与电磁模拟的比较表明,两个散射区域都是各向异性的。对于外弧,我们估计各向异性$ a_r $约为1.3,散射不规则与平行于脉冲星速度对齐。对于外弧,我们将观察到的延迟曲线与从理论强散射模型计算的延迟曲线进行比较。我们的结果表明,单元环中散射不规则的空间光谱比kolmogorov更平坦,但是需要进一步的观察以证实这一点。

High sensitivity interstellar scintillation and polarization observations of PSR~B0656+14 made at three epochs over a year using the Five-hundred-meter Aperture Spherical radio Telescope (FAST) show that the scattering is dominated by two different compact regions. We identify the one nearer to the pulsar with the shell of the Monogem Ring, thereby confirming the association. The other is probably associated with the Local Bubble. We find that the observed position angles of the pulsar spin axis and the space velocity are significantly different, with a separation of $19\fdg3\pm$0\fdg8, inconsistent with a previously published near-perfect alignment of $1\degr\pm 2\degr$. The two independent scattering regions are clearly defined in the secondary spectra which show two strong forward parabolic arcs. The arc curvatures imply that the scattering screens corresponding to the outer and inner arcs are located approximately 28~pc from PSR B0656+14 and 185~pc from the Earth, respectively. Comparison of the observed Doppler profiles with electromagnetic simulations shows that both scattering regions are mildly anisotropic. For the outer arc, we estimate the anisotropy $A_R$ to be approximately 1.3, with the scattering irregularities aligned parallel to the pulsar velocity. For the outer arc, we compare the observed delay profiles with delay profiles computed from a theoretical strong-scattering model. Our results suggest that the spatial spectrum of the scattering irregularities in the Monogem Ring is flatter than Kolmogorov, but further observations are required to confirm this.

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