论文标题
长周期脉冲星是超新星后备积聚的可能结果
Long-period Pulsars as Possible Outcomes of Supernova Fallback Accretion
论文作者
论文摘要
在大约半个世纪的时间里，观察到无线电脉冲星人群在〜0.002-12s的范围内旋转，不同的脉冲星类具有自旋周期的演化，这取决于其磁场或过去的吸积史。最近发现几个缓慢旋转的脉冲星的检测重新开辟了确切物理学的长期问题，以及观察性偏见，推动了脉冲星人群周期范围的上限。在这项工作中，我们对脉冲星与超新星后备物质相互作用的旋转性演变进行了参数研究，并特别研究了后备积聚磁盘的情况。根据形成时的初始条件，这种演变可能与典型的偶极旋转可能有很大不同，从而导致脉冲星的旋转周期比其同时同龄人更长。通过使用出生时脉冲星旋转周期和磁场的一般假设，初始后备积聚率以及包括磁场衰减，我们发现在存在强，磁性的磁场（> 10^{14} g）的存在下，可以达到很长的自旋周期（> 100），并且可以达到较长的旋转期（> 10^{14} g）和中度的初始后备率（〜10^{14} g）和初始下回落率（〜10^10^{22-27} g s^s^^s^^）。此外，我们研究了两个最近发现的定期无线电源的病例，即PULSAR PSR J0901-4046（P = 75.9 s）和无线电瞬态GLEAM-X \，J162759.5-523504.3（P = 1091 s），以我们的模型为单位。我们得出的结论是，超新星的后备场景可以代表一个可行的渠道，以产生一系列长期孤立的脉冲星人，只有最近的观察运动才开始揭晓。
For about half a century the radio pulsar population was observed to spin in the ~0.002-12s range, with different pulsar classes having a spin-period evolution that differs substantially depending on their magnetic fields or past accretion history. The recent detection of several slowly rotating pulsars has re-opened the long-standing question of the exact physics, and observational biases, driving the upper bound of the period range of the pulsar population. In this work, we perform a parameter study of the spin-period evolution of pulsars interacting with supernova fallback matter and specifically look at the fallback accretion disk scenario. Depending on the initial conditions at formation, this evolution can differ substantially from the typical dipolar spin-down, resulting in pulsars that show spin periods longer than their coeval peers. By using general assumptions for the pulsar spin period and magnetic field at birth, initial fallback accretion rates and including magnetic field decay, we find that very long spin periods (>100s) can be reached in the presence of strong, magnetar-like magnetic fields (>10^{14}G) and moderate initial fallback accretion rates (~10^{22-27} g s^{-1}). In addition, we study the cases of two recently discovered periodic radio sources, the pulsar PSR J0901-4046 (P = 75.9 s) and the radio transient GLEAM-X\,J162759.5-523504.3 (P = 1091 s), in light of our model. We conclude that the supernova fallback scenario could represent a viable channel to produce a population of long-period isolated pulsars that only recent observation campaigns are starting to unveil.
