The Frequency-dependent Modulation Features of PSR J1948+3540
Using observations from the Giant Metrewave Radio Telescope and FAST, we conducted multiwavelength studies on PSR J1948+3540 and analyzed its intensity modulation characteristics in detail. We found that the intensity modulation of this pulsar exhibits broad low-frequency modulation features. The mo...
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IOP Publishing
2025-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/add1b6 |
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| author | Kaige Chang Na Wang Feifei Kou Wenming Yan Jianping Yuan Shijun Dang Jumei Yao Vishal Gajjar Xia Zhou |
| author_facet | Kaige Chang Na Wang Feifei Kou Wenming Yan Jianping Yuan Shijun Dang Jumei Yao Vishal Gajjar Xia Zhou |
| author_sort | Kaige Chang |
| collection | DOAJ |
| description | Using observations from the Giant Metrewave Radio Telescope and FAST, we conducted multiwavelength studies on PSR J1948+3540 and analyzed its intensity modulation characteristics in detail. We found that the intensity modulation of this pulsar exhibits broad low-frequency modulation features. The modulation frequency/period is time dependent, but the dominant modulation component varies with the observing frequency. Specifically, at low frequencies, the modulation is dominated by the first half of the middle component, while at high frequencies, it is dominated by the second half of the middle component. Spectral analysis revealed that the intensities of the leading and trailing components vary with the observing frequency, but the middle component does not change significantly. In addition, the polarization analyses reveal that the peak of the radiation intensity is located in the latter half of the middle component, whereas the linear polarization is dominant in the former half. However, due to the low degree of linear polarization, the change of the dominant modulation component with the observed frequency is not caused by the variation in linear polarization. The phenomenon of the dominant modulation component varying with observing frequency has not been reported before and remains difficult to understand within the current theoretical framework. |
| format | Article |
| id | doaj-art-0a23c253dcb54513a64f4163bd8a76cc |
| institution | DOAJ |
| issn | 1538-4357 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj-art-0a23c253dcb54513a64f4163bd8a76cc2025-08-20T03:10:23ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-01986110510.3847/1538-4357/add1b6The Frequency-dependent Modulation Features of PSR J1948+3540Kaige Chang0https://orcid.org/0009-0005-1069-0855Na Wang1https://orcid.org/0000-0002-9786-8548Feifei Kou2https://orcid.org/0000-0002-0069-831XWenming Yan3https://orcid.org/0000-0002-7662-3875Jianping Yuan4https://orcid.org/0000-0002-5381-6498Shijun Dang5https://orcid.org/0000-0002-2060-5539Jumei Yao6https://orcid.org/0000-0002-4997-045XVishal Gajjar7https://orcid.org/0000-0002-8604-106XXia Zhou8https://orcid.org/0000-0003-4686-5977School of Physical Science and Technology, Xinjiang University , Urumqi, Xinjiang 830046, People’s Republic of China; Xinjiang Astronomical Observatory , Chinese Academy of Sciences, Urumqi, Xinjiang 830011, People’s Republic of China ; na.wang@xao.ac.cn, koufeifei@xao.as.cn, yanwm@xao.as.cnXinjiang Astronomical Observatory , Chinese Academy of Sciences, Urumqi, Xinjiang 830011, People’s Republic of China ; na.wang@xao.ac.cn, koufeifei@xao.as.cn, yanwm@xao.as.cn; Key Laboratory of Radio Astronomy and Technology (Chinese Academy of Sciences) , A20 Datun Road, Chaoyang District, Beijing 100101, People’s Republic of China; Xinjiang Key Laboratory of Radio Astrophysics , Urumqi 830011, People’s Republic of ChinaXinjiang Astronomical Observatory , Chinese Academy of Sciences, Urumqi, Xinjiang 830011, People’s Republic of China ; na.wang@xao.ac.cn, koufeifei@xao.as.cn, yanwm@xao.as.cn; Key Laboratory of Radio Astronomy and Technology (Chinese Academy of Sciences) , A20 Datun Road, Chaoyang District, Beijing 100101, People’s Republic of China; Xinjiang Key Laboratory of Radio Astrophysics , Urumqi 830011, People’s Republic of ChinaXinjiang Astronomical Observatory , Chinese Academy of Sciences, Urumqi, Xinjiang 830011, People’s Republic of China ; na.wang@xao.ac.cn, koufeifei@xao.as.cn, yanwm@xao.as.cn; Key Laboratory of Radio Astronomy and Technology (Chinese Academy of Sciences) , A20 Datun Road, Chaoyang District, Beijing 100101, People’s Republic of China; Xinjiang Key Laboratory of Radio Astrophysics , Urumqi 830011, People’s Republic of ChinaXinjiang Astronomical Observatory , Chinese Academy of Sciences, Urumqi, Xinjiang 830011, People’s Republic of China ; na.wang@xao.ac.cn, koufeifei@xao.as.cn, yanwm@xao.as.cn; Key Laboratory of Radio Astronomy and Technology (Chinese Academy of Sciences) , A20 Datun Road, Chaoyang District, Beijing 100101, People’s Republic of China; Xinjiang Key Laboratory of Radio Astrophysics , Urumqi 830011, People’s Republic of ChinaSchool of Physics and Electronic Science, Guizhou Normal University , Guiyang 550025, People’s Republic of China; Guizhou Radio Astronomical Observatory, Guizhou University , Guiyang 550025, People’s Republic of China; Guizhou Provincial Key Laboratory of Radio Astronomy and Data Processing , Guiyang 550025, People’s Republic of ChinaXinjiang Astronomical Observatory , Chinese Academy of Sciences, Urumqi, Xinjiang 830011, People’s Republic of China ; na.wang@xao.ac.cn, koufeifei@xao.as.cn, yanwm@xao.as.cn; Key Laboratory of Radio Astronomy and Technology (Chinese Academy of Sciences) , A20 Datun Road, Chaoyang District, Beijing 100101, People’s Republic of China; Xinjiang Key Laboratory of Radio Astrophysics , Urumqi 830011, People’s Republic of ChinaUniversity of California, Berkeley , 94720, USAXinjiang Astronomical Observatory , Chinese Academy of Sciences, Urumqi, Xinjiang 830011, People’s Republic of China ; na.wang@xao.ac.cn, koufeifei@xao.as.cn, yanwm@xao.as.cn; Key Laboratory of Radio Astronomy and Technology (Chinese Academy of Sciences) , A20 Datun Road, Chaoyang District, Beijing 100101, People’s Republic of China; Xinjiang Key Laboratory of Radio Astrophysics , Urumqi 830011, People’s Republic of ChinaUsing observations from the Giant Metrewave Radio Telescope and FAST, we conducted multiwavelength studies on PSR J1948+3540 and analyzed its intensity modulation characteristics in detail. We found that the intensity modulation of this pulsar exhibits broad low-frequency modulation features. The modulation frequency/period is time dependent, but the dominant modulation component varies with the observing frequency. Specifically, at low frequencies, the modulation is dominated by the first half of the middle component, while at high frequencies, it is dominated by the second half of the middle component. Spectral analysis revealed that the intensities of the leading and trailing components vary with the observing frequency, but the middle component does not change significantly. In addition, the polarization analyses reveal that the peak of the radiation intensity is located in the latter half of the middle component, whereas the linear polarization is dominant in the former half. However, due to the low degree of linear polarization, the change of the dominant modulation component with the observed frequency is not caused by the variation in linear polarization. The phenomenon of the dominant modulation component varying with observing frequency has not been reported before and remains difficult to understand within the current theoretical framework.https://doi.org/10.3847/1538-4357/add1b6PulsarsRadio pulsars |
| spellingShingle | Kaige Chang Na Wang Feifei Kou Wenming Yan Jianping Yuan Shijun Dang Jumei Yao Vishal Gajjar Xia Zhou The Frequency-dependent Modulation Features of PSR J1948+3540 The Astrophysical Journal Pulsars Radio pulsars |
| title | The Frequency-dependent Modulation Features of PSR J1948+3540 |
| title_full | The Frequency-dependent Modulation Features of PSR J1948+3540 |
| title_fullStr | The Frequency-dependent Modulation Features of PSR J1948+3540 |
| title_full_unstemmed | The Frequency-dependent Modulation Features of PSR J1948+3540 |
| title_short | The Frequency-dependent Modulation Features of PSR J1948+3540 |
| title_sort | frequency dependent modulation features of psr j1948 3540 |
| topic | Pulsars Radio pulsars |
| url | https://doi.org/10.3847/1538-4357/add1b6 |
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