From emission to absorption: the FAST observation of the OH 18-cm lines from the Comet C2025/A6

Dongyue Jiang, Lei Qian, Minglei Guo +14

We observed comet C/2025 A6 with the Five-hundred-meter Aperture Spherical radio Telescope (FAST) equipped with the ultra-wideband receiver from 2025 October 23 to November 8, and…