ASKAP Data Products for Project AS209 (FLASH): catalogues

The First Large Absorption Survey in HI (FLASH) is a wide-field survey for the redshifted 21-cm line of neutral atomic hydrogen (HI) seen in absorption against background radio continuum sources. FLASH covers the frequency range from 712 to 1000 MHz, corresponding to a redshift range from z = 0.4 to 1.0 for HI. With a look-back time of 4 to 8 Gyr, FLASH probes a cosmic epoch where our current knowledge of the amount of HI in and around galaxies is patchy and incomplete. The full FLASH survey will cover at least 24,000 square degrees of sky and is expected to detect several hundred associated and intervening HI absorption systems. A full description of the survey is given by Allison et al. 2022 (PASA 39, e010).中性氢（HI）首次大吸收巡天（FLASH）是一项以本底射电连续谱源为背景，探测红移中性氢21厘米谱线吸收的宽视场巡天项目。该巡天的观测频段覆盖712至1000 MHz，对应中性氢的红移区间为z=0.4至1.0。其回溯时长达40至80亿年，所探测的宇宙纪元中，当前学界对星系内部及周围的中性氢含量认知仍零散且不完整。完整的FLASH巡天将覆盖至少24000平方度的天区，预计将探测到数百个伴生及居间中性氢吸收系统。该巡天的完整细节由Allison等人于2022年发表于《澳大利亚天文学会期刊》（PASA 39, e010）一文进行阐述。