Interstellar Scintillation and Polarization of PSR B0656+14 in the Monogem Ring
Interstellar Scintillation and Polarization of PSR B0656+14 in the Monogem Ring
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DOI：
10.3847/1538-4357/ac9667
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发表时间：
2022-09
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通讯作者：
Jumei Yao;W. Coles;R. Manchester;D. Stinebring;M. Kramer;Na Wang;Di Li;Weiwei Zhu;Yi Feng;Jian-ping Yuan;Pei Wang
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作者：
Jumei Yao;W. Coles;R. Manchester;D. Stinebring;M. Kramer;Na Wang;Di Li;Weiwei Zhu;Yi Feng;Jian-ping Yuan;Pei Wang
利用500米口径球面射电望远镜（FAST）对PSR B0656+14进行了一年三个时期的高灵敏度星际闪烁和偏振观测，结果表明散射由两个不同的致密区域主导。我们将离脉冲星较近的那颗星与Monogem环的壳层联系在一起，从而证实了这种联系。另一个可能与本地泡沫有关。我们发现观测到的脉冲星自旋轴的位置角和空间速度有很大的不同，分离度为19.°3 ± 0.°8，与先前发表的1° ± 2°的接近完美的对准不一致。在次级光谱中，两个独立的散射区域被清楚地定义，这两个区域显示出两个强的前向抛物弧。弧曲率意味着对应于外弧和内弧的散射屏分别位于距离PSR B0656+14和185 pc的地方。所观察到的多普勒轮廓与电磁模拟的比较表明，这两个散射区域是温和的各向异性。对于外弧，我们估计的各向异性A R约为1.3，平行于脉冲星速度的散射不规则性。对于外弧，我们比较所观察到的延迟配置文件与延迟配置文件计算从理论上的强散射模型。我们的结果表明，在Monogem环的散射不规则性的空间谱是平坦的比Kolmogorov，但需要进一步的观察来证实这一点。
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 spatial velocity are significantly different, with a separation of 19.°3 ± 0.°8, inconsistent with a previously published near-perfect alignment of 1° ± 2°. 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.