A nebular origin for the persistent radio emission of fast radio bursts

• 成果类型: Article
• 署名作者: Bruni, Gabriele; Piro, Luigi; Yang, Yuan-Pei; Quai, Salvatore; Zhang, Bing; Palazzi, Eliana; Nicastro, Luciano; Feruglio, Chiara; Tripodi, Roberta; O'Connor, Brendan; Gardini, Angela; Savaglio, Sandra; Rossi, Andrea; Guelbenzu, Ana M. Nicuesa; Paladino, Rosita
• 署名单位: Istituto Nazionale Astrofisica (INAF); Yunnan University; Purple Mountain Observatory, CAS; Chinese Academy of Sciences; Nanjing Institute of Astronomical Optics & Technology, NAOC, CAS; University of Bologna; Istituto Nazionale Astrofisica (INAF); Nevada System of Higher Education (NSHE); University of Nevada Las Vegas; Nevada System of Higher Education (NSHE); University of Nevada Las Vegas; Istituto Nazionale Astrofisica (INAF); University of Trieste; Carnegie Mellon University; Consejo Superior de Investigaciones Cientificas (CSIC); CSIC - Instituto de Astrofisica de Andalucia (IAA); University of Calabria; Istituto Nazionale di Fisica Nucleare (INFN)
• 刊物名称: Nature
• ISSN/ISSBN: 0028-6922
• DOI: 10.1038/s41586-024-07782-6
• 发表日期: 2024-08-29
• 页码: 1014-+
• 关键词: magnetic-field; host galaxy; frb; quiet; environment; continuum; pulsars; bright

摘要

Fast radio bursts (FRBs) are millisecond-duration, bright (approximately Jy) extragalactic bursts, whose production mechanism is still unclear(1). Recently, two repeating FRBs were found to have a physically associated persistent radio source of non-thermal origin(2,3). These two FRBs have unusually large Faraday rotation measure values(2,3), probably tracing a dense magneto-ionic medium, consistent with synchrotron radiation originating from a nebula surrounding the FRB source(4-8). Recent theoretical arguments predict that, if the observed Faraday rotation measure mostly arises from the persistent radio source region, there should be a simple relation between the persistent radio source luminosity and the rotation measure itself(7,9). Here we report the detection of a third, less luminous persistent radio source associated with the repeating FRB source FRB20201124A at a distance of 413Mpc, substantially expanding the predicted relation into the low luminosity-low Faraday rotation measure regime (<1,000radm(-2)). At lower values of the Faraday rotation measure, the expected radio luminosity falls below the limit-of-detection threshold for present-day radio telescopes. These findings support the idea that the persistent radio sources observed so far are generated by a nebula in the FRB environment and that FRBs with low Faraday rotation measure may not show a persistent radio source because of a weaker magneto-ionic medium. This is generally consistent with models invoking a young magnetar as the central engine of the FRB, in which the surrounding ionized nebula-or the interacting shock in a binary system-powers the persistent radio source.