by Dr. Tony Phillips
A star is born. A star is born. A star is born.
Repeat that phrase 4000 times and you start to get an idea what life is like in distant galaxy J100054+023436.
Astronomers using NASA’s Spitzer Space Telescope and ground-based observatories have found that the galaxy gives birth to as many as 4000 stars a year. For comparison, in the same period of time the Milky Way produces only about 10. This makes J100054+023436 an extreme starburst galaxy.
âWe call it the âBaby Boom galaxy,â? says Peter Capak of NASAâs Spitzer Science Center at the California Institute of Technology in Pasadena, CA. “It is undergoing a major baby boom, producing most of its stars all at once. If our human population was produced in a similar boom, then almost allÂ people alive today would be the same age.”
Capak is lead author of a paper entitled “Spectroscopic Confirmation of an Extreme Starburst at Redshift 4.547” detailing the discovery in the July 10th issue of Astrophysical Journal Letters.
The galaxy appears to be a merger, a âtrain wreckâ? of two or more galaxies crashing together. The crash is what produces the baby boom. Clouds of interstellar gas within the two galaxies press against one another and collapse to form stars, dozens to hundreds at a time.
This isnât the first time astronomers have witnessed a galaxy producing so many stars. âThere are some other extreme starburst galaxies in the local universe,â? says Capek. But the Baby Boom galaxy is special because it is not local. It lies about 12.3 billion light years from Earth, which means we are seeing it as it was 12.3 billion years ago. The universe itself is no older than 14 billion years, so this galaxy is just a youngster (Capak likens it to a 6-year-old human) previously thought to be incapable of such rapid-fire star production.
The Baby Boom galaxy poses a challenge to the Hierarchical Model of galaxy evolution favored by many astronomers. According to the Hierarchical Model, galaxies grow by merging; Add two small galaxies together, and you get a bigger galaxy. In the early years of the universe, all galaxies were small, and they produced correspondingly small bursts of star formation when they merged. âYet in J100054+023436, we see an extreme starburst. The merging galaxies must be pretty large.â?
Capak and colleagues are busy looking for more Baby Boomers âto see if this is a one-off case or a common occurrence.â? The theory of evolution of galaxies hangs in the balance.
Meanwhileâ¦ A star is born. A star is born. A star is born.
This article was provided by the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration.
The âBaby Boomâ? galaxy loosely resembles the galaxy shown here, called Zw II 96, in this Hubble Space Telescope image. This galaxy is only 500 million light-years away, while the Baby Boom galaxy is 12.3 billion light-years away.