发表机构
IISER Bhopal; National Centre for Radio Astrophysics, SP Pune University Campus; Indian Institute of Technology Roorkee; The Institute of Mathematical Sciences; Homi Bhabha National Institute（印度科学教育研究所博帕尔分校; 国家射电天体物理中心，浦那大学校区; 印度理工学院罗尔基分校; 数学科学研究院; 霍米·巴巴国立研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究利用升级后的巨米波射电望远镜对磁星PSR J1818-1607进行低频观测，识别其连续谱源，发现流量密度和谱指数变化及两个射电耀发事件，并探讨辐射机制，同时报告档案巡天中未见弥散辐射。
AI 中文摘要
我们报告了使用升级后的巨米波射电望远镜在波段3（300-500 MHz）和波段4（550-750 MHz）对磁星PSR J1818$-$1607进行的低频射电观测。我们已识别出与该磁星相关的连续谱源，并报告了其流量密度及其谱指数的变化。该磁星的流量密度时间序列揭示了两个潜在的射电耀发事件，它们具有不同的谱特性。我们讨论了谱指数变化对射电亮磁星潜在辐射机制的影响。我们还报告了在多个档案射电成像巡天中未探测到该连续谱源，也没有直接迹象表明存在相关的弥散辐射。
英文摘要
We report on the low-frequency radio observations of magnetar PSR J1818$-$1607 carried out with the upgraded Giant Metrewave Radio Telescope at band 3 (300$-$500 MHz) and band 4 (550-750 MHz). We have identified the continuum source associated with the magnetar and report variations in flux density and its spectral index. The flux density timeseries for the magnetar reveals the presence of two potential radio flaring episodes with varying spectral properties. We discuss the implications of the spectral index changes on the potential emission mechanisms for radio-loud magnetars. We also report non-detections of the continuum source as well as no direct indication for an associated diffuse emission from multiple archival radio imaging surveys.
