Intrinsic Pulse Widths of FRB 20121102A and Calculation of Broadening from Propagation and Instrumental Effects
The pulse widths of fast radio bursts are always broadened due to the scattering of the plasma medium through which the electromagnetic wave passes. The recorded pulse width will be further affected by the radio telescopes since the sampling time and the bandwidth cannot be infinitely small. In this...
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2025-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/adace3 |
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| author | Jia-Peng Wei Yong-Feng Huang Lang Cui Xiang Liu Jin-Jun Geng Xue-Feng Wu |
| author_facet | Jia-Peng Wei Yong-Feng Huang Lang Cui Xiang Liu Jin-Jun Geng Xue-Feng Wu |
| author_sort | Jia-Peng Wei |
| collection | DOAJ |
| description | The pulse widths of fast radio bursts are always broadened due to the scattering of the plasma medium through which the electromagnetic wave passes. The recorded pulse width will be further affected by the radio telescopes since the sampling time and the bandwidth cannot be infinitely small. In this study, we focus on the pulse widths of at least 3287 bursts detected from FRB 20121102A as of 2023 October. Various effects such as the scattering broadening, the redshift-induced broadening, and the instrumental broadening are examined. At a redshift of 0.193, the pulse width is broadened by a factor of approximately 0.16 due to cosmological time dilation. It is found that the instrumental broadening only contributes a fraction of 10 ^−3 –10 ^−1 to the observed pulse width. The scattering broadening is even smaller, which constitutes a tiny fraction of 10 ^−5 –10 ^−2 in the observed pulse width. After correcting for these broadenings, the intrinsic pulse width is derived for each burst. The maximum and minimum pulse widths at different frequencies are highlighted. The intrinsic widths of most bursts are in a narrow range of 1–10 ms, which leads to a quasi-linear correlation between the fluence and the peak flux. Additionally, the mean value and the dispersion range of intrinsic pulse width are found to scale with the central frequency as ν ^−1.2±0.2 and ν ^−1.7±0.6 , respectively. |
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| institution | Kabale University |
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| language | English |
| publishDate | 2025-01-01 |
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| spelling | doaj-art-ff1a804bb52743ad9cb84d0002cad9e82025-02-07T08:01:16ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-01980111410.3847/1538-4357/adace3Intrinsic Pulse Widths of FRB 20121102A and Calculation of Broadening from Propagation and Instrumental EffectsJia-Peng Wei0Yong-Feng Huang1https://orcid.org/0000-0001-7199-2906Lang Cui2Xiang Liu3Jin-Jun Geng4https://orcid.org/0000-0001-9648-7295Xue-Feng Wu5https://orcid.org/0000-0002-6299-1263School of Astronomy and Space Science, Nanjing University , Nanjing 210023, People’s Republic of China ; [email protected] of Astronomy and Space Science, Nanjing University , Nanjing 210023, People’s Republic of China ; [email protected]; Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University) , Ministry of Education, Nanjing 210023, People’s Republic of ChinaXinjiang Astronomical Observatory, Chinese Academy of Sciences , 150 Science 1-Street, Urumqi 830011, People’s Republic of China; Key Laboratory of Radio Astronomy, Chinese Academy of Sciences , 150 Science 1-Street, Urumqi 830011, People’s Republic of China; Xinjiang Key Laboratory of Radio Astrophysics , 150 Science 1-Street, Urumqi 830011, People’s Republic of ChinaXinjiang Astronomical Observatory, Chinese Academy of Sciences , 150 Science 1-Street, Urumqi 830011, People’s Republic of China; Key Laboratory of Radio Astronomy, Chinese Academy of Sciences , 150 Science 1-Street, Urumqi 830011, People’s Republic of China; Xinjiang Key Laboratory of Radio Astrophysics , 150 Science 1-Street, Urumqi 830011, People’s Republic of ChinaPurple Mountain Observatory, Chinese Academy of Sciences , Nanjing 210023, People’s Republic of ChinaPurple Mountain Observatory, Chinese Academy of Sciences , Nanjing 210023, People’s Republic of ChinaThe pulse widths of fast radio bursts are always broadened due to the scattering of the plasma medium through which the electromagnetic wave passes. The recorded pulse width will be further affected by the radio telescopes since the sampling time and the bandwidth cannot be infinitely small. In this study, we focus on the pulse widths of at least 3287 bursts detected from FRB 20121102A as of 2023 October. Various effects such as the scattering broadening, the redshift-induced broadening, and the instrumental broadening are examined. At a redshift of 0.193, the pulse width is broadened by a factor of approximately 0.16 due to cosmological time dilation. It is found that the instrumental broadening only contributes a fraction of 10 ^−3 –10 ^−1 to the observed pulse width. The scattering broadening is even smaller, which constitutes a tiny fraction of 10 ^−5 –10 ^−2 in the observed pulse width. After correcting for these broadenings, the intrinsic pulse width is derived for each burst. The maximum and minimum pulse widths at different frequencies are highlighted. The intrinsic widths of most bursts are in a narrow range of 1–10 ms, which leads to a quasi-linear correlation between the fluence and the peak flux. Additionally, the mean value and the dispersion range of intrinsic pulse width are found to scale with the central frequency as ν ^−1.2±0.2 and ν ^−1.7±0.6 , respectively.https://doi.org/10.3847/1538-4357/adace3Interstellar mediumIntergalactic mediumRadio burstsRadio transient sourcesCompact radiation sources |
| spellingShingle | Jia-Peng Wei Yong-Feng Huang Lang Cui Xiang Liu Jin-Jun Geng Xue-Feng Wu Intrinsic Pulse Widths of FRB 20121102A and Calculation of Broadening from Propagation and Instrumental Effects The Astrophysical Journal Interstellar medium Intergalactic medium Radio bursts Radio transient sources Compact radiation sources |
| title | Intrinsic Pulse Widths of FRB 20121102A and Calculation of Broadening from Propagation and Instrumental Effects |
| title_full | Intrinsic Pulse Widths of FRB 20121102A and Calculation of Broadening from Propagation and Instrumental Effects |
| title_fullStr | Intrinsic Pulse Widths of FRB 20121102A and Calculation of Broadening from Propagation and Instrumental Effects |
| title_full_unstemmed | Intrinsic Pulse Widths of FRB 20121102A and Calculation of Broadening from Propagation and Instrumental Effects |
| title_short | Intrinsic Pulse Widths of FRB 20121102A and Calculation of Broadening from Propagation and Instrumental Effects |
| title_sort | intrinsic pulse widths of frb 20121102a and calculation of broadening from propagation and instrumental effects |
| topic | Interstellar medium Intergalactic medium Radio bursts Radio transient sources Compact radiation sources |
| url | https://doi.org/10.3847/1538-4357/adace3 |
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