glenc
18-12-2012, 03:23 AM
"New observations by the Hubble Space Telescope reveal some of the earliest galaxies in the universe.
...Photometric redshifts are less precise than spectroscopic ones (http://lsst.org/lsst/science/scientist_photometric_redshift), which measure specific spectral lines and determine how much their wavelengths have shifted due to cosmic expansion.
... the astronomers found seven galaxies that fit in the time range they set out to study. The redshifts range from 8.6 (about 590 million years after the Big Bang) to 9.5 (510 million years), with one outlier potentially at 11.9.
...The new results might mark the limit for Hubble: by design Hubble cannot see earlier than a redshift of about 12, notes study coauthor James Dunlop (University of Edinburgh, Scotland)"
http://www.skyandtelescope.com/news/Hubble-Takes-Galaxy-Census-183361811.html
...Photometric redshifts are less precise than spectroscopic ones (http://lsst.org/lsst/science/scientist_photometric_redshift), which measure specific spectral lines and determine how much their wavelengths have shifted due to cosmic expansion.
... the astronomers found seven galaxies that fit in the time range they set out to study. The redshifts range from 8.6 (about 590 million years after the Big Bang) to 9.5 (510 million years), with one outlier potentially at 11.9.
...The new results might mark the limit for Hubble: by design Hubble cannot see earlier than a redshift of about 12, notes study coauthor James Dunlop (University of Edinburgh, Scotland)"
http://www.skyandtelescope.com/news/Hubble-Takes-Galaxy-Census-183361811.html