论文标题
Meerkat上的千幽门阵列计划-X。107脉冲星的闪烁弧线
The Thousand-Pulsar-Array programme on MeerKAT -- X. Scintillation arcs of 107 pulsars
论文作者
论文摘要
我们介绍了在856---1712 \,MHz的107个脉冲星的检测,使用Meerkat千脉冲阵列程序观察到。闪烁弧似乎无处不在,在清洁,高的S/N观测值中,其检测主要受到短时间观察的限制和粗频道的分辨率。这导致调查对附近的,较小的脉冲星敏感,其有效速度很高 - 从适当的运动,附近的脉冲星或地球附近的屏幕上敏感。我们测量所有来源中的弧曲率,可用于以已知正确的运动或正确运动的估计来对脉冲星的屏幕距离进行估计。 J1731 $ - $ 4744中的简短闪烁时间尺度意味着源的PC中的散射屏幕,强烈暗示了该Pulsar和Supernova Remnant RCW 114之间的关联。我们测量了5个脉冲显示的多个抛物线弧形弧线,所有这些脉动脉冲都具有弱光,并且具有高度适当的运动。此外,几个来源显示了倒弧的暗示,暗示了各向异性筛查的散射。在这项工作的基础上,进一步针对许多这些脉冲星的Meerkat观察将改善对我们当地散射环境和闪烁起源的理解。年度闪烁曲线将导致良好的屏幕距离测量值,并且时间和频率在ARCLET的演变中可以约束闪烁的模型。
We present the detection of 107 pulsars with interstellar scintillation arcs at 856--1712\,MHz, observed with the MeerKAT Thousand Pulsar Array Programme. Scintillation arcs appear to be ubiquitous in clean, high S/N observations, their detection mainly limited by short observing durations and coarse frequency channel resolution. This led the survey to be sensitive to nearby, lightly scattered pulsars with high effective velocity -- from a large proper motion, a screen nearby the pulsar, or a screen near the Earth. We measure the arc curvatures in all of our sources, which can be used to give an estimate of screen distances in pulsars with known proper motion, or an estimate of the proper motion. The short scintillation timescale in J1731$-$4744 implies a scattering screen within 12\,pc of the source, strongly suggesting the association between this pulsar and the supernova remnant RCW 114. We measure multiple parabolic arcs of 5 pulsars, all of which are weakly scintillating with high proper motion. Additionally, several sources show hints of inverted arclets suggesting scattering from anisotropic screens. Building on this work, further targeted MeerKAT observations of many of these pulsars will improve understanding of our local scattering environment and the origins of scintillation; annual scintillation curves would lead to robust screen distance measurements, and the evolution of arclets in time and frequency can constrain models of scintillation.