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Unformatted text preview: ratio is referred to as the birthrate parameter . Starburst triggering mechanisms As viewed from our position 12.2 billion light years away, the Baby Boom Galaxy is seen to be creating 4,000 stars per year. Credit: NASA Essentially to ignite a starburst, it is necessary to concentrate a large amount of cool molecular gas in a small volume. Such concentrations and perturbations are strongly suspected to cause global starburst phenomena in major galaxy mergers, although the exact mechanisms are not fully understood. Observational surveys have long since shown that there is often a burst of disk star-formation in merging and interacting pairs of galaxies. It is also currently believed that nearby interactions between galaxies that don't actually merge can trigger unstable rotation modes, such as the bar instability, that cause gas to be funneled towards the nucleus, igniting bursts of star formation near the galactic nucleus....
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