H I absorption line and anomalous dispersion in the radio pulses of PSR B1937+21
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866916870088556544 |
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| author | Jiang, Jinchen Cao, Shunshun Lee, Kejia Wang, Bojun Xu, Heng Chen, Siyuan Guo, Yanjun Jiang, Peng Jing, Weicong Lu, Jiguang Xu, Jiangwei Xu, Renxin Xue, Zihan |
| author_facet | Jiang, Jinchen Cao, Shunshun Lee, Kejia Wang, Bojun Xu, Heng Chen, Siyuan Guo, Yanjun Jiang, Peng Jing, Weicong Lu, Jiguang Xu, Jiangwei Xu, Renxin Xue, Zihan |
| contents | We use the Five-hundred-meter Aperture Spherical radio Telescope to observe the bright millisecond pulsar PSR B1937+21 (J1939+2134) and record the data in the band from 1.0 to 1.5 GHz. We measure the neutral hydrogen (HI) emission and absorption lines near 1420 MHz ($λ\simeq 21$ cm). We derive the kinematic distance of the pulsar with the HI observation. By comparing this with the archival absorption spectra observed decades ago, we notice possible variations in the absorption spectra toward this pulsar, which correspond to a possible tiny-scale atomic structure of a few astronomical units in size. We also verify the apparent faster-than-light anomalous dispersion at the HI absorption line of this pulsar previously reported. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_19934 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | H I absorption line and anomalous dispersion in the radio pulses of PSR B1937+21 Jiang, Jinchen Cao, Shunshun Lee, Kejia Wang, Bojun Xu, Heng Chen, Siyuan Guo, Yanjun Jiang, Peng Jing, Weicong Lu, Jiguang Xu, Jiangwei Xu, Renxin Xue, Zihan High Energy Astrophysical Phenomena We use the Five-hundred-meter Aperture Spherical radio Telescope to observe the bright millisecond pulsar PSR B1937+21 (J1939+2134) and record the data in the band from 1.0 to 1.5 GHz. We measure the neutral hydrogen (HI) emission and absorption lines near 1420 MHz ($λ\simeq 21$ cm). We derive the kinematic distance of the pulsar with the HI observation. By comparing this with the archival absorption spectra observed decades ago, we notice possible variations in the absorption spectra toward this pulsar, which correspond to a possible tiny-scale atomic structure of a few astronomical units in size. We also verify the apparent faster-than-light anomalous dispersion at the HI absorption line of this pulsar previously reported. |
| title | H I absorption line and anomalous dispersion in the radio pulses of PSR B1937+21 |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2502.19934 |