FATHOMER survey: III. Preliminary HI galaxy identification results

We present the HI galaxy observation results of the FATHOMER (FAst neuTral HydrOgen intensity Mapping ExpeRiment), a pilot drift scan survey by the Five-hundred-meter Aperture Spherical radio Telescope (FAST). The survey comprises 28 hours of observations over 7 nights in 2021, covering a $60\, \deg^2$ sky area in the frequency range 1.05–1.45 GHz. There are 702 HI galaxy candidates identified within the observed sky. A total of 702 galaxies are identified with HI mass above 10^6.2 Msun, signal-to-noise ratio greater than 5, and redshift z < 0.09.本研究呈现了FATHOMER（FAst neuTral HydrOgen intensity Mapping ExpeRiment，快速中性氢强度测绘实验）的中性氢（HI）星系观测结果，该项目为500米口径球面射电望远镜（FAST）开展的先导漂移扫描巡天项目。本次巡天于2021年开展，历时7个观测夜，总观测时长28小时，覆盖60平方度的天区范围，观测频率区间为1.05–1.45 GHz。在该观测天区内，共识别出702个中性氢星系候选体。最终确认的702个星系均满足以下条件：中性氢质量高于10^6.2倍太阳质量，信噪比大于5，红移z<0.09。