ALMA and Webb Reveal Galactic Shock is Shaping Stephan’s Quintet in Mysterious Ways Shockwaves resulting from the violent collision between an intruder galaxy and Stephan’s Quintet are helping astronomers to understand how turbulence influences gas in the intergalactic medium. New observations with
has kickstarted a recycling plant for warm and cold molecular hydrogen gas. What’s more, scientists uncovered the break-up of a giant cloud into a fog of warm gas, the possible collision of two clouds forming a splash of warm gas around them, and the formation of a new galaxy. The observations were presented on Monday, January 9, 2023, in a press conference at the 241st meeting of the American Astronomical Society in Seattle, Washington.
That clean window into the Universe has allowed astronomers to watch what’s happening as one of the galaxies, NGC 7318b, violently intrudes into the group at a relative speed of roughly 800 km/second. At that speed, a trip from Earth to the Moon would take just eight minutes.
Stephan’s Quintet is a group of five galaxies—NGC 7317, NGC 7318a, NGC 7318b, NGC 7319, and NGC 7320— generally located about 270 million light-years from Earth in the constellation Pegasus. Credit: IAU/Sky & Telescope
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