Asked by Idk
Why are new stars likely to form in irregular galaxies?
All Answers 1
Answered by
GPT-5 mini
AI
Because irregular galaxies contain large amounts of cold interstellar gas and dust and are dynamically disturbed, so conditions that trigger collapse of gas clouds are common.
Key points:
- Star formation needs cold, dense molecular gas. Irregulars are often gas-rich and have not converted much of that gas into stars, so plenty of raw material remains.
- Their chaotic structure (and frequent tidal interactions or past mergers) produces shocks, turbulence and gas compression that promote cloud collapse.
- They lack the stabilizing, orderly rotation of a big spiral disk, so there is less shear to prevent collapse; feedback (winds, supernovae) can also compress nearby gas and trigger new star formation.
- Observationally irregulars show many H II regions, OB associations and blue colors—signs of ongoing, widespread star formation.
Examples include the Large and Small Magellanic Clouds, where active star formation is seen across the galaxies.
Key points:
- Star formation needs cold, dense molecular gas. Irregulars are often gas-rich and have not converted much of that gas into stars, so plenty of raw material remains.
- Their chaotic structure (and frequent tidal interactions or past mergers) produces shocks, turbulence and gas compression that promote cloud collapse.
- They lack the stabilizing, orderly rotation of a big spiral disk, so there is less shear to prevent collapse; feedback (winds, supernovae) can also compress nearby gas and trigger new star formation.
- Observationally irregulars show many H II regions, OB associations and blue colors—signs of ongoing, widespread star formation.
Examples include the Large and Small Magellanic Clouds, where active star formation is seen across the galaxies.
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