论文标题
伽马射线的心跳由微Quasar SS 433
Gamma-ray heartbeat powered by the microquasar SS 433
论文作者
论文摘要
微QuaSars是外层状类星体的局部兄弟姐妹，是包含紧凑物体和伴随恒星的二进制系统。通过从同伴那里吸收物质，微Quasars发出了强大的风和喷气机，影响了周围的星际环境。预计稳定的伽马射线发射将从其中心物体或流出与周围介质之间的相互作用上升。最近，通过在高（TEV）能量下检测SS 433的预测。在本报告中，我们分析了该来源上Fermi Gamma-Ray空间望远镜的十多年的GEV伽马射线数据。对数据的详细审查表明，SS 433附近的发射，共同空间具有增强气体，以及可能与其中一种喷气机的末端叶有关的发射提示。两种伽马射线过量均离中心二元相对较远，前者显示出在SS 433的前期期间周期性差异的证据，将其与微QuaSar联系起来。该结果挑战了明显的解释，并且从任何先前发表的理论模型中都是出乎意料的。它为我们提供了从SS 433的颗粒传输并探测其附近局部磁场的结构的机会。
Microquasars, the local siblings of extragalactic quasars, are binary systems comprising a compact object and a companion star. By accreting matter from their companions, microquasars launch powerful winds and jets, influencing the interstellar environment around them. Steady gamma-ray emission is expected to rise from their central objects, or from interactions between their outflows and the surrounding medium. The latter prediction was recently confirmed with the detection of SS 433 at high (TeV) energies. In this report, we analyze more than ten years of GeV gamma-ray data from the Fermi Gamma-ray Space Telescope on this source. Detailed scrutiny of the data reveal emission in the SS 433 vicinity, co-spatial with a gas enhancement, and hints for emission possibly associated with a terminal lobe of one of the jets. Both gamma-ray excesses are relatively far from the central binary, and the former shows evidence for a periodic variation at the precessional period of SS 433, linking it with the microquasar. This result challenges obvious interpretations and is unexpected from any previously published theoretical models. It provides us with a chance to unveil the particle transport from SS 433 and to probe the structure of the local magnetic field in its vicinity.
