comscore Hubble Space Telescope captures spectacular firework in nearby galaxy
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Hubble Space Telescope captures spectacular firework in nearby galaxy

A team of astronomers found that a firestorm of star birth is lighting up one end of the diminutive galaxy Kiso 5639.

  • Updated: June 30, 2016 4:40 PM IST
rsz_hubble-skyrocket

NASA s Hubble Space Telescope has captured a spectacular fireworks display in a small, nearby galaxy, which resembles a skyrocket. A team of astronomers found that a firestorm of star birth is lighting up one end of the diminutive galaxy Kiso 5639. The dwarf galaxy is shaped like a flattened pancake, but because it is tilted edge-on, it resembles a skyrocket, with a brilliant blazing head and a long, star-studded tail. Also Read - High-speed solar storm to hit Earth today, impact phone signals: NASA warns

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Astronomers suggested that the frenzied star birth is sparked by intergalactic gas raining on one end of the galaxy as it drifts through space. “I think Kiso 5639 is a beautiful, up-close example of what must have been common long ago, said lead researcher Debra Elmegreen of Vassar College, in Poughkeepsie, New York. Also Read - NASA Perseverance Mars rover uses 1998 iMac processor with just one upgrade

“The current thinking is that galaxies in the early universe grow from accreting gas from the surrounding neighbourhood. It s a stage that galaxies, including our Milky Way, must go through as they are growing up, Elmegreen said.

Elmegreen used Hubble s Wide Field Camera 3 to conduct a detailed imaging study of Kiso 5639. The images in different filters reveal information about an object by dissecting its light into its component colours.

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Hubble s crisp resolution helped Elmegreen and her team analyse the giant star-forming clumps in the galaxy and determine the masses and ages of the star clusters. Hubble uncovered several dozen clusters of stars in the galaxy s star-forming head, which spans 2,700 light-years across. These clusters have an average age of less than one million years and masses that are three to six times larger than those in the rest of the galaxy. Other star formation is taking place throughout the galaxy but on a much smaller scale.

“There is much more star formation going on in the head than what you would expect in such a tiny galaxy, said team member Bruce Elmegreen of IBM s Thomas J. Watson s Research Center, in Yorktown Heights, New York.

The galaxy, located 82 million light-years away, has taken billions of years to develop because it has been drifting through an isolated desert in the universe, devoid of much gas.

What triggered the starburst in such a backwater galaxy?

Based on simulations by Daniel Ceverino of the Centre for Astronomy at Heidelberg University in Germany, and other team members, the observations suggest that less than one million years ago, Kiso 5639 s leading edge encountered a filament of gas. The filament dropped a large clump of matter onto the galaxy, stoking the vigorous star birth.

The team’s results have been accepted for publication in The Astrophysical Journal.

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  • Published Date: June 30, 2016 4:35 PM IST
  • Updated Date: June 30, 2016 4:40 PM IST



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