FAST detection of OH emission in the carbon-rich planetary nebula NGC 7027
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arXiv
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| Autores principales: | , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866916348241641472 |
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| author | Ouyang, Xu-Jia Zhang, Yong Zhang, Chuan-Peng Jiang, Peng Nakashima, Jun-ichi Chen, Xi Qiao, Hai-Hua Zhang, Xu-Ying Sun, Hao-Min Li, Xiao-Hu Zijlstra, Albert |
| author_facet | Ouyang, Xu-Jia Zhang, Yong Zhang, Chuan-Peng Jiang, Peng Nakashima, Jun-ichi Chen, Xi Qiao, Hai-Hua Zhang, Xu-Ying Sun, Hao-Min Li, Xiao-Hu Zijlstra, Albert |
| contents | We present the first detection of the ground-state OH emission line at 1612 MHz toward the prototypical carbon-rich planetary nebula (PN) NGC 7027, utilizing the newly installed ultra-wideband (UWB) receiver of the Five-hundred-meter Aperture Spherical radio Telescope (FAST). This emission is likely to originate from the interface of the neutral shell and the ionized region. The other three ground-state OH lines at 1665, 1667, and 1721 MHz are observed in absorption and have velocities well matched with that of HCO$^+$ absorption. We infer that the OH absorption is from the outer shell of NGC 7027, although the possibility that they are associated with a foreground cloud cannot be completely ruled out. All the OH lines exhibit a single blue-shifted component with respect to the central star. The formation of OH in carbon-rich environments might be via photodissociation-induced chemical processes. Our observations offer significant constraints for chemical simulations, and they underscore the potent capability of the UWB receiver of FAST to search for nascent PNe. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_02962 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | FAST detection of OH emission in the carbon-rich planetary nebula NGC 7027 Ouyang, Xu-Jia Zhang, Yong Zhang, Chuan-Peng Jiang, Peng Nakashima, Jun-ichi Chen, Xi Qiao, Hai-Hua Zhang, Xu-Ying Sun, Hao-Min Li, Xiao-Hu Zijlstra, Albert Astrophysics of Galaxies Solar and Stellar Astrophysics We present the first detection of the ground-state OH emission line at 1612 MHz toward the prototypical carbon-rich planetary nebula (PN) NGC 7027, utilizing the newly installed ultra-wideband (UWB) receiver of the Five-hundred-meter Aperture Spherical radio Telescope (FAST). This emission is likely to originate from the interface of the neutral shell and the ionized region. The other three ground-state OH lines at 1665, 1667, and 1721 MHz are observed in absorption and have velocities well matched with that of HCO$^+$ absorption. We infer that the OH absorption is from the outer shell of NGC 7027, although the possibility that they are associated with a foreground cloud cannot be completely ruled out. All the OH lines exhibit a single blue-shifted component with respect to the central star. The formation of OH in carbon-rich environments might be via photodissociation-induced chemical processes. Our observations offer significant constraints for chemical simulations, and they underscore the potent capability of the UWB receiver of FAST to search for nascent PNe. |
| title | FAST detection of OH emission in the carbon-rich planetary nebula NGC 7027 |
| topic | Astrophysics of Galaxies Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2408.02962 |