FAST Ultra-Deep Survey: Data Release for FUDS0

Hongwei Xi, Bo Peng, Lister Staveley-Smith, Bi-Qing For, Bin Liu and Dejian Ding
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Abstract

We have used the Five-hundred-meter Aperture Spherical radio Telescope (FAST) to conduct a blind ultradeep survey for neutral hydrogen (H i). We present the complete results from the first of six fields (FUDS0). These observations of 95 hr allowed us to achieve a high-sensitivity (∼50 μJy beam−1) and a high-frequency resolution (22.9 kHz) over an area of 0.72 deg2. We detected 128 galaxies in H i distributed over the redshift range of 0 < z < 0.4, with H i masses in the range of , and three faint high-velocity clouds, with a peak column density of NH i ≤ 3.1 × 1017 cm−2. Of the galaxies, 95 are new detections and six have z > 0.38, where no unlensed H i emission has previously been directly detected. Estimates of completeness and reliability are presented for the catalog. The consistency of continuum and H i flux estimates with the NRAO VLA Sky Survey and the Arecibo Ultra-Deep Survey, respectively, confirms the accuracy of the calibration method and data reduction pipeline developed for the full FAST Ultra-Deep Survey.
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FAST 超深空探测:FUDS0 数据发布
我们利用五百米孔径球面射电望远镜(FAST)对中性氢(H i)进行了一次超深度盲观测。我们展示了六个观测场(FUDS0)中第一个观测场的完整结果。这些长达 95 小时的观测使我们在 0.72 平方英寸的区域内达到了高灵敏度(∼50 μJy beam-1)和高频分辨率(22.9 kHz)。我们探测到了128个H i星系,它们分布在0 < z < 0.4的红移范围内,H i质量在 ,以及三个微弱的高速云,峰值柱密度为NH i ≤ 3.1 × 1017 cm-2。在这些星系中,有 95 个是新探测到的,6 个星系的 z 值大于 0.38,在这些星系中,以前没有直接探测到过非凝聚 H i 辐射。对星表的完整性和可靠性进行了估计。连续波和 H i 通量的估计值分别与 NRAO VLA 巡天和阿雷西博超深巡天保持一致,这证实了为整个 FAST 超深巡天开发的校准方法和数据缩减管道的准确性。
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