Keck and Spitzer Find First Stars in Distant Galaxies
MAUNA KEA (April 2, 2005) Astronomers have used the Keck, Spitzer and Hubble telescopes to catch the light coming from the first stars to form in some of the most distant galaxies yet seen. Dr. Andrew Bunker of the University of Exeter announced the results show the formation of the first galaxies may have got underway earlier than previously thought.

The team used Hubble Space Telescope data to identify remote galaxies that were suitable for further study. They then analyzed archived images taken at infrared wavelengths with NASA’s Spitzer Space Telescope. Confirmation of their extreme remoteness was provided by the 10-meter Keck II telescope and the Deep Extragalactic Imager and Multi-Object Spectrometer (DEIMOS) in Hawaii.

“We proved these galaxies are indeed among the most distant known by using the Keck telescopes to take a spectrum,” said Dr. Elizabeth Stanway of the University of Wisconsin at Madison.

The Keck spectra showed that the galaxies have redshifts of about 6, which means they are so far away that light from them has taken about 13 billion years to reach us. Telescopes show them as they were when the Universe was less than a billion years old - eight billion years before the Earth and Sun formed.

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