A new result from the molecular gas survey in the Southern Pinwheel Galaxy M83 using the Atacama Large Millimeter/submillimeter Array (ALMA) Telescope reveals a discovery of 10 high-velocity clouds composed of molecular gas, moving at velocities significantly different from M83’s overall rotation, an indication that the influx of these gases—which help to form stars—are from outside the galaxy.



Summary

ALMA observations of the Southern Pinwheel Galaxy (M83) have revealed 10 high-velocity molecular gas clouds. These clouds move at speeds inconsistent with M83’s rotation, suggesting an extragalactic origin. This discovery points to the inflow of star-forming molecular gas from outside the galaxy. The introduction of external gas provides a mechanism for fueling star formation activity within M83. The study sheds light on how galaxies acquire the raw materials needed for continued stellar birth, challenging assumptions about galactic gas dynamics.

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