A Galactic Bullseye
Messier 94 is a stunning example of a starburst galaxy. It features two extraordinary rings: an inner, brilliantly bright ring where stars are forming at an incredible rate, and a much fainter, more expansive outer ring. For a long time, astronomers thought the outer ring was a closed circle of stars, but modern imaging reveals it is actually a complex pair of spiral arms that have been tightly wound. Unlike many other galaxies, M94 appears to have very little dark matter in its inner regions, a mystery that continues to challenge our understanding of galactic evolution.
Imaging Challenges
- • Dynamic Range: The inner ring is so bright it can easily blow out, while the outer ring is extremely faint and requires long integration.
- • Color Grading: Maintaining the distinct blue of the starburst ring against the yellowish glow of the older central population.
- • Noise Management: Stretching deep enough to see the outer shell without destroying the fine detail in the core.
The inner ring of M94 is roughly 7,000 light-years in diameter and is responsible for producing nearly all of the galaxy's new stars.