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The FAST All Sky HI survey (FASHI) was designed to cover the entire skyobservable by the Five-hundred-meter Aperture Spherical radio Telescope (FAST),spanning approximately 22000 square degrees of declination between -14 deg and+66 deg, and in the frequency range of 1050-1450 MHz, with the expectation ofeventually detecting more than 1 HI sources. Between August 2020 and June2023, FASHI had covered more than 7600 square degrees, which is approximately35% of the total sky observable by FAST. It has a median detection sensitivityof around 0.76 mJy/beam and a spectral line velocity resolution of ~6.4 km/s ata frequency of ~1.4 GHz. As of now, a total of 41741 extragalactic HI sourceshave been detected in the frequency range 1305.5-1419.5 MHz, corresponding to aredshift limit of z<0.09. By cross-matching FASHI sources with the Siena GalaxyAtlas (SGA) and the Sloan Digital Sky Survey (SDSS) catalogs, we found that16972 (40.7%) sources have spectroscopic redshifts and 10975 (26.3%) sourceshave only photometric redshifts. Most of the remaining 13794 (33.0%) HI sourcesare located in the direction of the Galactic plane, making their opticalcounterparts difficult to identify due to high extinction or high contaminationof Galactic stellar sources. Based on current survey results, the FASHI surveyis an unprecedented blind extragalactic HI survey. It has higher spectral andspatial resolution and broader coverage than the Arecibo Legacy Fast ALFASurvey (ALFALFA). When completed, FASHI will provide the largest extragalacticHI catalog and an objective view of HI content and large-scale structure in thelocal universe.

The FAST all sky HI survey (FASHI): The first release of catalog