A nebular origin for the persistent radio emission of fast radio bursts
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| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866916282254753792 |
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| author | 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, A. M. Nicuesa Paladino, Rosita |
| author_facet | 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, A. M. Nicuesa Paladino, Rosita |
| contents | Fast radio bursts (FRBs) are millisecond-duration, bright ($\sim$Jy) extragalactic bursts, whose production mechanism is still unclear. Recently, two repeating FRBs were found to have a physically associated persistent radio source of non-thermal origin. These two FRBs have unusually large Faraday rotation measure values likely tracing a dense magneto-ionic medium, consistent with synchrotron radiation originating from a nebula surrounding the FRB source. 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 luminosity of the latter and the first. We report here the detection of a third, less luminous persistent radio source associated with the repeating FRB source FRB20201124A at a distance of 413 Mpc, significantly expanding the predicted relation into the low luminosity - low Faraday rotation measure regime ($<$1000 rad m-2). At lower values of the Faraday rotation measure, the expected radio luminosity falls below the limit of detection threshold for present-day radio telescopes. These findings support the idea that the persistent radio sources observed so far are generated by a nebula in the FRB environment, and that FRBs with low Faraday rotation measure may not show a persistent radio source because of a weaker magneto-ionic medium. This is generally consistent with models invoking a young magnetar as the central engine of the FRB, where the surrounding ionized nebula - or the interacting shock in a binary system - powers the persistent radio source. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2312_15296 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | A nebular origin for the persistent radio emission of fast radio bursts Bruni, Gabriele Piro, Luigi Yang, Yuan-Pei Quai, Salvatore Zhang, Bing Palazzi, Eliana Nicastro, Luciano Feruglio, Chiara Tripodi, Roberta O'Connor, Brendan Gardini, Angela Savaglio, Sandra Rossi, Andrea Guelbenzu, A. M. Nicuesa Paladino, Rosita High Energy Astrophysical Phenomena Fast radio bursts (FRBs) are millisecond-duration, bright ($\sim$Jy) extragalactic bursts, whose production mechanism is still unclear. Recently, two repeating FRBs were found to have a physically associated persistent radio source of non-thermal origin. These two FRBs have unusually large Faraday rotation measure values likely tracing a dense magneto-ionic medium, consistent with synchrotron radiation originating from a nebula surrounding the FRB source. Recent theoretical arguments predict that, if the observed Faraday rotation measure mostly arises from the persistent radio source region, there should be a simple relation between the luminosity of the latter and the first. We report here the detection of a third, less luminous persistent radio source associated with the repeating FRB source FRB20201124A at a distance of 413 Mpc, significantly expanding the predicted relation into the low luminosity - low Faraday rotation measure regime ($<$1000 rad m-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, where the surrounding ionized nebula - or the interacting shock in a binary system - powers the persistent radio source. |
| title | A nebular origin for the persistent radio emission of fast radio bursts |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2312.15296 |