FAST Search for Circumstellar Atomic Hydrogen. I. The Young Planetary Nebula IC 4997

@article{Ouyang2022FASTSF,
  title={FAST Search for Circumstellar Atomic Hydrogen. I. The Young Planetary Nebula IC 4997},
  author={Xu-Jia Ouyang and Yong Zhang and Albert A. Zijlstra and Chuan-Peng Zhang and Jun-ichi Nakashima and Quentin A. Parker},
  journal={The Astrophysical Journal},
  year={2022},
  volume={933}
}
Using the Five-hundred-meter Aperture Spherical radio Telescope in Guizhou, China, we detect the 21 cm neutral atomic hydrogen absorption in the young planetary nebula IC 4997. The absorption arises from a shell that is also associated with Na i D lines. The H i shell has a mass of 1.46 × 10−2 M ⊙ and a dynamic age of 990 yr. The column density of H i is estimated to be 7.1 × 1020 cm−2, which can be well explained in terms of a photodissociation region around the ionized nebula, limited by the… 

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