Second Light: A Massive Starburst Galaxy 1.1 Billion Years After the Big Bang

摘要

The Hubble Deep Field was a long observation of a spot in the sky, using the Hubble Space Telescope. The purpose was to search for galaxies in the early Universe. It was followed up at several different wavelengths, including the sub-millimetre, where the signature of active star formation at high redshifts is seen (Hughes etal. in the 1998 July 16 issue of Nature).The brighfc sub-millimetre source in the Hubble Deep Field (HDF850.1) has remained mysterious till now. No counterpart is known at any other wavelength, and no redshift had been determined, but Fabian Walter of the Max Planck Institute of Astronomy, in Heidelberg Germany, and his colleagues have now measurei its redshift to be 5.18, which is strikingly bigger than almost a other sub-millimetre-bright galaxies (see the 2012 June 14 issi of Nature).