论文标题
使用内部冲击模型对伽马射线二进制HESS J0632+057的宽带发射进行调查
Investigation of the broadband emission of the gamma-ray binary HESS J0632+057 using an intrabinary shock model
论文作者
论文摘要
我们使用现象学内电击（IBS）模型研究了大量的X射线和伽马射线光谱能量分布（SED）和多带光曲线（LC）数据。我们的基线模型假设IBS是通过从假定的脉冲星碰撞及其伴随的风而形成的，并且粒子在IBS中通过Synchrotron（sy）和逆孔普顿向上散射（ICS）过程加速了宽带辐射。采用最新的轨道解决方案和系统几何形状（Tokayer等，2021），我们复制了全球X射线和TEV LC功能，带有$ ϕ \ sim 0.3 $ 0.3 $和$ \ sim0.7 $的两个宽大颠簸，带有SY和ICS模型组件。我们发现，这些TEV LC峰源自periastron附近的种子光子密度增强，在下部结合下IBS中的散装粒子的上层或多普勒束发射引起的ICS发射。尽管我们的IBS模型成功地解释了大多数观察到的SED和LC数据，但我们发现TEV频段中的相位分辨的SUD数据需要与预激颗粒ICS发射相关的附加组件（由Pulsar Wind产生）。这一发现表明有可能描述IBS发射成分并确定某些轨道阶段的脉冲星风的大量洛伦兹因子。
We investigated a wealth of X-ray and gamma-ray spectral energy distribution (SED) and multi-band light curve (LC) data of the gamma-ray binary HESS J0632+057 using a phenomenological intrabinary shock (IBS) model. Our baseline model assumes that the IBS is formed by colliding winds from a putative pulsar and its Be companion, and particles accelerated in the IBS emit broadband radiation via synchrotron (SY) and inverse-Compton upscattering (ICS) processes. Adopting the latest orbital solution and system geometry (Tokayer et al. 2021), we reproduced the global X-ray and TeV LC features, two broad bumps at $ϕ\sim 0.3$ and $\sim0.7$, with the SY and ICS model components. We found these TeV LC peaks originate from ICS emission caused by the enhanced seed photon density near periastron and superior conjunction or Doppler-beamed emission of bulk-accelerated particles in the IBS at inferior conjunction. While our IBS model successfully explained most of the observed SED and LC data, we found that phase-resolved SED data in the TeV band require an additional component associated with ICS emission from pre-shock particles (produced by the pulsar wind). This finding indicates a possibility of delineating the IBS emission components and determining the bulk Lorentz factors of the pulsar wind at certain orbital phases.
