Starburst - formed stars, including massive stars that...

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Starburst M82 , the archetype starburst galaxy, has experienced a 10-fold increase [70] in star formation rate as compared to a "normal" galaxy. Stars are created within galaxies from a reserve of cold gas that forms into giant molecular clouds . Some galaxies have been observed to form stars at an exceptional rate, known as a starburst. Should they continue to do so, however, they would consume their reserve of gas in a time frame lower than the lifespan of the galaxy. Hence starburst activity usually lasts for only about ten million years, a relatively brief period in the history of a galaxy. Starburst galaxies were more common during the early history of the universe, [71] and, at present, still contribute an estimated 15% to the total star production rate. [72] Starburst galaxies are characterized by dusty concentrations of gas and the appearance of newly
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Unformatted text preview: formed stars, including massive stars that ionize the surrounding clouds to create H II regions . [73] These massive stars produce supernova explosions, resulting in expanding remnants that interact powerfully with the surrounding gas. These outbursts trigger a chain reaction of star building that spreads throughout the gaseous region. Only when the available gas is nearly consumed or dispersed does the starburst activity come to an end. [71] Starbursts are often associated with merging or interacting galaxies. The prototype example of such a starburst-forming interaction is M82 , which experienced a close encounter with the larger M81 . Irregular galaxies often exhibit spaced knots of starburst activity...
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