The FAST all sky HI survey (FASHI) is a survey that will provide the largest extragalactic HI catalog. The first release of the catalog was made on June 19, 2022.
FASHI has a higher spectral and spatial resolution and broader coverage than the Arecibo Legacy Fast ALFA Survey (ALFALFA). Between August 2020 and June 2023, FASHI covered more than 7,600 square degrees, which is about 35% of the total sky observable by FAST. The FASHI team has detected a total of 41,741 extragalactic HI sources in the frequency range 1,305.5–1,419.5 MHz.
Extragalactic astronomy is the study of objects outside the Milky Way galaxy. Research into distant galaxies is valuable for studying aspects of the universe such as galaxy evolution and Active Galactic Nuclei.
FASHI team has detected a total of 41,741 extragalactic HI sources in the frequency range 1,305.5–1,419.5 MHz. When completed, FASHI team will provide the largest extragalactic HI catalog and an objective view of HI content and large-scale structure in the local universe
The FAST All Sky HI Survey (FASHI) is a project that covers the entire sky visible by the Five-hundred-meter Aperture Spherical radio Telescope (FAST). The project began in August 2020 and concluded in June 2023.
FASHI is a three-year project that claims to reveal the secrets of 41,000 galaxies and HI sources beyond our galaxy
The Five-hundred-meter Aperture Spherical Telescope (FAST) is located in Pingtang County, Guizhou, China. It’s the world’s largest single-unit radio telescope, with a main antenna that’s 500 meters (1,600 feet) in diameter
The FAST telescope was built between 2011 and 2016, and saw first light in September 2016. It’s nicknamed Tianyan, which translates to “Sky’s/Heaven’s Eye
The Five-hundred-meter Aperture Spherical Telescope (FAST) has a sensitivity of 2,000 m2/K. Its sensitivity is more than 2.5 times that of the world’s second largest telescope
The sensitivity of a telescope is determined by three factors:
- The area of the primary mirror
- The sensitivity of the detector
- The brightness of the sky
FAST’s main goals include:
- Studying pulsars
- Detecting neutral hydrogen in distant galaxies
- Searching for extraterrestrial intelligence (SETI) signals
FAST has detected more than 1600 fast radio bursts from a single enigmatic system.
The Five-hundred-meter Aperture Spherical Telescope (FAST) is a radio telescope. It’s also the world’s largest single-dish radio telescope, with a receiving area equivalent to 30 football fields
FAST is also the largest filled-aperture radio telescope and the second largest single dish aperture. It has a reflecting surface of 500 meters in diameter.
FAST is a Chinese mega-science project that began operations in 2016. Its goal is to discover the laws of the development of the universe
The Five-hundred-meter Aperture Spherical Radio Telescope (FAST) has made several discoveries, including:
- The largest atomic cloud In 2022, FAST discovered the biggest atomic cloud ever found, which is 20 times larger than the Milky Way and likely a billion years old. This discovery could help scientists understand how galaxies form and find similar gaseous structures elsewhere in the universe.
- Pulsars In 2017, FAST discovered its first two pulsars, PSR J1859-01 and PSR J1931-02, which are 16,000 and 4,100 light years away, respectively. As of March 2023, FAST has discovered over 740 pulsars, making it the most efficient pulsar discovery telescope in the world.
- Magnetic field strength In 2022, FAST scientists measured the magnetic field strength in a molecular cloud, a region of the interstellar medium that may be ready to form stars.
- Nanohertz gravitational waves In 2023, Chinese scientists found evidence of the existence of nanohertz gravitational waves using pulsar timing observations from FAST.
- Fast radio bursts In June 2022, a research team discovered and located the first persistently active repeating fast radio burst (FRB) with the help of FAST.
FAST’s other goals include:
- Reconstructing images of the early universe
- Studying electromagnetic radiation from pulsars to develop timing, navigation, and gravitational wave detection technology
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Universe discoveries 