Stars forming ‘much more rapidly than previously believed’

WASHINGTON - Astronomers have presented the first conclusive evidence for a dramatic surge in star birth in a newly discovered population of massive galaxies in the early Universe.

Their measurements confirm the idea that stars formed most rapidly about 11 billion years ago, or about three billion years after the Big Bang, and that the rate of star formation is much faster than was thought.

The scientists used the European Space Agency’s Herschel Space Observatory, an infrared telescope with a mirror 3.5 m in diameter, launched in 2009.

They studied the distant objects in detail with the Spectral and Photometric Imaging Receiver (SPIRE) camera, obtaining solid evidence that the galaxies are forming stars at a tremendous rate and have large reservoirs of gas that will power the star formation for hundreds of millions of years.

“These Herschel-SPIRE measurements have revealed that a population of galaxies is hotter than expected, due to forming stars far more rapidly than we previously believed,” said Dr Scott Chapman from the Institute of Astronomy at the University of Cambridge.
The key to the new results is the recent discovery of a new type of extremely luminous galaxy in the early Universe.

These galaxies are very faint in visible light, as the newly-formed stars are still cocooned in the clouds of of gas and dust within which they were born.

This cosmic dust, which has a temperature of around -240 degrees Celsius, is much brighter at the longer, far infrared wavelengths observed by the Herschel satellite.

A related type of galaxy was first found in 1997 (but not well understood until 2003) using the ‘SCUBA’ camera attached to the James Clerk Maxwell Telescope on Hawaii, which detects radiation emitted at even longer sub-millimetre wavelengths.

But these distant ’sub-millimetre galaxies’ were thought to only represent half the picture of star formation in the early Universe. Since SCUBA preferentially detects colder objects, it was suggested that similar galaxies with slightly warmer temperatures could exist but have gone largely unnoticed.

The researchers measured their distances using the Keck optical telescope on Hawaii and the Plateau de Bure sub-millimetre observatory in France, but were unable to show that they were in the throes of rapid star formation.

Herschel is the first telescope with the capability to detect these galaxies at the peak of their output, so Chapman joined forces with the ‘HerMES’ team, led by Professor Seb Oliver of the University of Sussex and Dr Jamie Bock in Caltech, who were undertaking the largest survey of galaxies with Herschel.

With the Herschel observations, focused on around 70 galaxies in the constellation of Ursa Major, the scientists acquired the missing piece of evidence to confirm that these galaxies represent a crucial episode in the build up of large galaxies around us today, such as our own Milky Way.

“With the data we had before, we couldn’t tell exactly where the infrared light from these galaxies comes from. But using SPIRE we can see that this is the signature of star formation,” said team member Professor Rob Ivison from the University of Edinburgh.

The new galaxies have prodigious rates of star formation, far higher than anything seen in the present-day Universe. They probably developed through violent encounters between hitherto undisturbed galaxies, after the first stars and galaxy fragments had already formed. one the less, studying these new objects gives astronomers an insight into early epochs of star formation after the Big Bang.

“It was amazing and surprising to see the Herschel-SPIRE observations uncover such a dramatic population of previously unseen galaxies,” said another team colleague Dr Isaac Roseboom from the University of Sussex.

“We are really blown away by the tremendous capability of Herschel to probe the distant universe. This work gives us a real handle on how the cosmos looked early in its life,” Professor Seb Oliver, also from Sussex, added.

The study appears in a special edition of the journal Monthly Notices of the Royal Astronomical Society. (ANI)