Hunting wide-area optical surveys for high proper motion isolated neutron stars
Hunting wide-area optical surveys for high proper motion isolated neutron stars
复制标题
寻找高自行孤立中子星的广域光学巡天
DOI：
10.1093/mnras/stab3428
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发表时间：
2021
影响因子：
4.8
通讯作者：
Takada Masahiro
中科院分区：
文献类型：
--
作者：
Toyouchi Daisuke;Hotokezaka Kenta;Takada Masahiro
被从诞生地踢出的高速中子星（HVNS）在遇到太阳附近时，可能会因其大的自行运动而被识别，并且可能具有大的视差。在本文中，我们通过对考虑自旋下降和热辐射的 NS 光度演化进行建模，研究了在广域光学巡天中寻找孤立的 HVNS 的可行性。假设即将进行 10 年 VRO LSST 观测，我们的模型计算预测大约 10 个主要由年龄为-年的脉冲星和-年热发射NS 组成的 HVNS 是可探测到的。我们发现，一些具有有效温度 K 的 NS，在当前和未来的 X 射线调查中可能会被遗漏，但也是可以检测到的。除了标准的中子星冷却模型外，我们还考虑暗物质加热模型。如果存在如此强烈的加热，我们发现可检测到的 HVNS 将明显变冷，即 K。因此，未来的光学观测将给出独特的NS样本，这可以为NS冷却和加热机制提供必要的约束。此外，我们建议通过光学测量提供 HVNS 样本有助于理解 NS 的内在踢速度分布。
High-velocity neutron stars (HVNSs) that were kicked out from their birth location can be potentially identified with their large proper motions, and possibly with large parallax, when they come across the solar neighborhood. In this paper, we study the feasibility of hunting isolated HVNSs in wide-area optical surveys by modeling the evolution of NS luminosity taking into account spin-down and thermal radiation. Assuming the upcoming 10-year VRO LSST observation, our model calculations predict that about 10 HVNSs mainly consisting of pulsars with ages of--yr and thermally emitting NSs with--yr are detectable. We find that a few NSs with effective temperatureK, which are likely missed in the current and future X-ray surveys, are also detectable. In addition to the standard neutron star cooling models, we consider a dark matter heating model. If such a strong heating exists we find that the detectable HVNSs would be significantly cooler, i.e.,K. Thus, the future optical observation will give an unique NS sample, which can provide essential constraints on the NS cooling and heating mechanisms. Moreover, we suggest that providing HVNS samples with optical surveys is helpful for understanding the intrinsic kick-velocity distribution of NSs.