A New Flaring Black Widow Candidate and Demographics of Black Widow Millisecond Pulsars in the Galactic Field
A New Flaring Black Widow Candidate and Demographics of Black Widow Millisecond Pulsars in the Galactic Field
复制标题
DOI：
10.3847/1538-4357/aca2ac
复制
发表时间：
2022-10
期刊：
影响因子：
--
通讯作者：
S. Swihart;J. Strader;L. Chomiuk;E. Aydi;K. Sokolovsky;P. Ray;M. Kerr
中科院分区：
文献类型：
--
作者：
S. Swihart;J. Strader;L. Chomiuk;E. Aydi;K. Sokolovsky;P. Ray;M. Kerr
我们发现了一个新的光学/X射线源，可能与费米γ射线源4FGL J1408.6-2917有关。它的高振幅周期性光学变化，大光谱径向速度半振幅，光发射线和耀斑的证据，和X射线特性一起暗示源可能是一个新的黑寡妇毫秒脉冲星双星。我们汇编了41个确认和疑似野外黑寡妇的属性，发现中等次级质量为0.027 ± 0.003 M Ω。与更大质量的红背毫秒脉冲星双星一起考虑，我们发现“蜘蛛”伴星质量分布仍然强烈双峰，基本上为零的系统伴星质量在0.07和0.1 M之间。黑寡妇的X射线发射通常比红背更柔和，亮度更低，这与黑寡妇双星内部激波中粒子加速效率较低一致，除了少数系统似乎具有更有效的“红背样”激波。黑寡妇和红背共同主导了具有已知伴星类型的双星中最快旋转场毫秒星的普查，占P自旋< 2 ms的系统的80%。与红背类似，黑寡妇中的中子星星质量平均明显大于典型的1.4 M质量，迄今为止，许多质量最高的中子星都是M NS = 2.1 M <$的黑寡妇。这两个观测结果都与进化图相一致，即蜘蛛毫秒双星是从短轨道周期的祖先中产生的，这些祖先在伴星位于主序星时开始了长时间的质量转移，导致快速旋转和高质量。
We present the discovery of a new optical/X-ray source likely associated with the Fermi γ-ray source 4FGL J1408.6–2917. Its high-amplitude periodic optical variability, large spectroscopic radial-velocity semiamplitude, evidence for optical emission lines and flaring, and X-ray properties together imply the source is probably a new black widow millisecond pulsar binary. We compile the properties of the 41 confirmed and suspected field black widows, finding a median secondary mass of 0.027 ± 0.003 M ⊙. Considered jointly with the more massive redback millisecond pulsar binaries, we find that the “spider” companion mass distribution remains strongly bimodal, with essentially zero systems having companion masses of between ∼0.07 and 0.1 M ⊙. X-ray emission from black widows is typically softer and less luminous than in redbacks, consistent with less efficient particle acceleration in the intrabinary shock in black widows, excepting a few systems that appear to have more efficient “redback-like” shocks. Together black widows and redbacks dominate the census of the fastest spinning field millisecond pulsars in binaries with known companion types, making up ≳80% of systems with P spin < 2 ms. Similar to redbacks, the neutron star masses in black widows appear on average significantly larger than the canonical 1.4 M ⊙, and many of the highest-mass neutron stars claimed to date are black widows with M NS ≳ 2.1 M ⊙. Both of these observations are consistent with an evolutionary picture where spider millisecond pulsars emerge from short orbital period progenitors that had a lengthy period of mass transfer initiated while the companion was on the main sequence, leading to fast spins and high masses.