The marketing image shows the project about the Five-hundred-meter Aperture Spherical radio Telescope (FAST) All Sky HI study (FASHI). Credit: © Science China PressThe FASHI study has mapped 35% of its target sky area with the FAST telescope, finding over 41,000 extragalactic HI sources, and gaining recognition in the astronomical community.The FAST All Sky Hello study (FASHI) was created to cover the whole sky observable by the Five-hundred-meter Aperture Spherical radio Telescope (FAST), covering roughly 22000 square degrees of declination in between -14 deg and +66 deg, and in the frequency variety of 1050-1450 MHz, with the expectation of ultimately spotting more than 100000 HI sources.Between August 2020 and June 2023, FASHI covered more than 7600 square degrees, which is roughly 35% of the total sky observable by FAST. The area surveyed in simply 3 years provides high hopes that the full sky that can be accessed by the FAST will be covered in record time!
