三个新的疑似蜘蛛毫秒脉冲星双星系统及双星内部激波的光学运动学示踪体
Three New Likely Spider Millisecond Pulsar Binaries and Optical Kinematic Tracers of Intrabinary Shocks
浏览论文内容
中文总结 AI 辅助
通过多波长观测发现三个候选蜘蛛毫秒脉冲星，其中两个确认为红背双星，并首次证明H-alpha发射线可示踪环绕脉冲星的双星内部激波，为光学运动学研究开辟新途径。
中文摘要 AI 辅助
我们通过多波长跟进未关联的费米大面积望远镜伽马射线源，报告发现了三个候选蜘蛛毫秒脉冲星。所有候选体均获得了SOAR 4.1米望远镜的光学光谱和Swift的X射线数据。其中两个光学/X射线源是极强红背候选体，它们位于伽马射线源4FGL J1020.4-5314和4FGL J1408.7-3747定位椭圆中心附近。我们证明这两个光学源均为光谱双星，其轨道周期（0.15-0.3天）和质量函数（0.6-0.9太阳质量）具有红背星的典型特征。4FGL J1020.4-5314在两年内获得的所有光谱中均显示出明亮且非常宽的（半高全宽2100公里/秒）H-alpha发射线。值得注意的是，H-alpha径向速度在相位上与伴星的吸收线速度存在偏移，并且与预期的主星附近发射源信号相匹配。这首次在任何蜘蛛脉冲星中证明，H-alpha发射线可与环绕脉冲星的双星内部激波相关联，从而开辟了在某些红背星中利用光学发射线作为双星内部激波运动学示踪体的可能性。第三个候选蜘蛛与伽马射线源4FGL J1429.8-0739的关联性不太确定，但其具有不寻常的特性，包括30.5小时的轨道周期、可能的亚巨星伴星以及高X射线光度，使其值得进一步研究。
英文摘要
We report the discovery of three candidate spider millisecond pulsars via multi-wavelength follow-up of unassociated Fermi Large Area Telescope gamma-ray sources. All have optical spectroscopy from the SOAR 4.1-m telescope and X-ray data from Swift. Two optical/X-ray sources are exceptionally strong redback candidates, sitting close to the centres of the localization ellipses of the gamma-ray sources 4FGL J1020.4-5314 and 4FGL J1408.7-3747. We show that both optical sources are spectroscopic binaries with orbital periods (0.15-0.3 d) and mass functions (0.6-0.9 Msun) typical for redbacks. 4FGL J1020.4-5314 shows bright, very broad (full width at half maximum 2100 km/s) H-alpha emission in all spectra obtained over two years. Remarkably, the H-alpha radial velocities are offset in phase from the absorption-line velocities of the secondary, and match the signal expected for an emission source near the primary. This demonstrates, for the first time for any spider, that the H-alpha emission can be associated with an intrabinary shock that wraps around the pulsar, opening up the possibility of using optical emission lines as kinematic tracers of the intrabinary shock in some redbacks. A third candidate spider is less secure in its association with the gamma-ray source 4FGL J1429.8-0739, but has unusual properties, including a 30.5-hour orbital period, a potential subgiant secondary, and a high X-ray luminosity, making it worthy of further investigation.
发表机构
- Michigan State University（密歇根州立大学）
- Texas Tech University（德克萨斯理工大学）
- U.S. Naval Research Laboratory（美国海军研究实验室）
- University of Notre Dame（圣母大学）
机构由 AI 辅助整理，请以论文原文为准。
