SIMBAD references

The FAST All Sky H I survey (FASHI) will cover the entire observable sky (∼22,000 square degrees) with the Five-hundred-meter Aperture Spherical radio Telescope (FAST). With the currently released data, we perform an untargeted survey of 21 cm H I absorption galaxies at redshift z ≲ 0.09 over an area of about 10,000 square degrees. We have detected 51 H I absorbers, including 21 previously known and 30 new ones. The probability of occurrence for the H I absorbers in all H I galaxies is 1/1078. The radio flux densities of the FASHI absorbers are mainly concentrated in the range of S_1.4GHz = 10 ∼ 100 mJy, but also as low as 2.6 ± 0.4 mJy. We find that the host galaxies of the associated H I absorbers have relatively high star formation rates, and there is a negative correlation between the H I column density and the stellar mass in the host galaxy. Consequently, FAST has significantly improved the capabilities and performance for H I absorption observations and has provided a true untargeted survey of 21 cm H I absorption galaxies for such studies.