Tag

Fast Telescope

All articles tagged with #fast telescope

science1 month ago•2 min saved

FAST Telescope Uncovers Why Star Formation Slows Despite Abundant Hydrogen

Using the FAST radio telescope and DESI, researchers analyzed ~2.5 million galaxies over 4.5 billion years to track neutral hydrogen. They found that 4.5 billion years ago the cosmic star-formation rate was about 2.5 times higher than today, while neutral hydrogen density was only ~1.4 times higher, indicating gas reserves did not simply deplete as star formation declined. The study suggests that as the overall gas density falls, the efficiency of converting neutral hydrogen to molecular gas (the fuel for stars) decreases, shrinking the molecular reservoir and slowing star formation. Findings published in Nature Astronomy.

via news.cgtn.com|

#astronomy #cosmology #fast-telescope

astronomy7 months ago•51 min saved

Cosmic Skeleton Revealed: A Hidden Filament Maps the Universe’s Web

Astronomers using the FAST radio telescope traced a nearly four-light-year-long, linear filament of galaxies in the Ursa Major Supergroup, providing direct observational evidence of a delicate cosmic web strand dominated by dark matter that guides gas flows and galaxy formation across the universe.

via Space|

#arxiv-preprint #astronomy #cosmic-web

science1 year ago•3 min saved

Astronomers Discover Rare and Bizarre Binary Star Systems

Chinese astronomers discovered a rare binary system, PSR J1928+1815, where a pulsar orbits inside another star, providing new insights into stellar evolution and mass exchange in binary systems, using the world's largest radio telescope, FAST.

via ScienceAlert|

#binary-star-systems #fast-telescope #neutron-star

science-and-technology2 years ago•1 min saved

China's FAST Telescope Unveils Cosmic Secrets of 41K Galaxies

China's FAST telescope, also known as the "China Sky Eye," has unveiled a comprehensive catalog of neutral hydrogen sources beyond our galaxy. The three-year project, called FASHI, utilized the world's largest single-dish radio telescope to detect faint and weak neutral hydrogen galaxies, providing more reliable and complete data quality.

via Interesting Engineering|

#china #fashi #fast-telescope

science-and-technology3 years ago•2 min saved

"China's FAST Telescope Unveils 76 Elusive Pulsars"

China's Five-hundred-meter Aperture Spherical Radio Telescope (FAST) has discovered 76 dim and sporadic pulsars, including the faintest known pulsars to date. The team also confirmed that rotating radio transients (RRATs) are intermittent pulsars. The intermittent pulsars discovered by FAST account for approximately 12% of the total number of pulsars discovered in the survey. The study provides insights into the dense remnants of dead stars and their radiation characteristics.

via Global Times|

#china #fast-telescope #intermittent-pulsars

astronomy3 years ago•3 min saved

"FAST Telescope Reveals Surprising 'Dwarf' Pulses and Their Origins"

Astronomers using the FAST telescope have discovered "dwarf pulses" from the pulsar PSR B2111+46, representing a unique radiation state with a rare reversed spectrum. These weak, narrow pulses provide insights into the mysteries of pulsar radiation processes and the extreme plasma conditions within a pulsar's magnetosphere. The observations of PSR B2111+46 revealed dozens of unusually weak pulses during nulling periods, which have been named "dwarf pulses." This new emission state, different from ordinary pulsar radiation, is produced by one or a few "raindrops" of particles generated in a fragile gap of the pulsar. Further study of these dwarf pulses could uncover unknown aspects of pulsar radiation and reveal the extreme plasma state within the pulsar magnetosphere.

via SciTechDaily|

#astronomy #dwarf-pulses #fast-telescope