论文标题
三个X射线发射毫秒的光谱和轮廓演化的更好视图
A NICER View of Spectral and Profile Evolution for Three X-ray Emitting Millisecond Pulsars
论文作者
论文摘要
我们提出了两年的中子星内部组成探索器（更优质）的X射线观测值，该观测值是三个能量旋转驱动的毫秒脉冲星（MSP）：PSRS B1937+21，B1821-24和J0218+4232。我们将高斯和洛伦兹人与软X射线状态的不同能量子带的脉冲曲线拟合，以测量脉冲分离和宽度的能量依赖性。我们发现，PSR J0218+4232的脉冲成分之间的分离会随着$ \ gt3σ$置信度的增加而降低。 PSRS B1937+21和B1821-24的脉冲分离演化的95％上限小于每KEV的2毫升。我们的相分辨光谱结果提供了有关这三个脉冲星的非热X射线发射的更新限制。 PSR B1937+21的每个脉冲分量的建模X射线发射光谱的光子指数在90％的置信度下彼此不一致，这表明每个脉冲的发射起源不同。我们发现PSR B1821-24和PSR J0218+4232发射光谱是不变的，相位的置信度为90％。我们描述了我们的轮廓和光谱的含义，在这三个具有非热，磁层X射线发射的MSP的赤道电流发射模型的背景下。
We present two years of Neutron star Interior Composition Explorer (NICER) X-ray observations of three energetic rotation-powered millisecond pulsars (MSPs): PSRs B1937+21, B1821-24, and J0218+4232. We fit Gaussians and Lorentzians to the pulse profiles for different energy sub-bands of the soft X-ray regime to measure the energy dependence of pulse separation and width. We find that the separation between pulse components of PSR J0218+4232 decreases with increasing energy at $\gt 3σ$ confidence. The 95% upper limit on pulse separation evolution for PSRs B1937+21 and B1821-24 is less than 2 milliperiods per keV. Our phase-resolved spectral results provide updated constraints on the non-thermal X-ray emission of these three pulsars. The photon indices of the modeled X-ray emission spectra for each pulse component of PSR B1937+21 are inconsistent with each other at the 90% confidence level, suggesting different emission origins for each pulse. We find that the PSR B1821-24 and PSR J0218+4232 emission spectra are invariant with phase at the 90% confidence level. We describe the implications of our profile and spectral results in the context of equatorial current sheet emission models for these three MSPs with non-thermal, magnetospheric X-ray emission.
