2dF Galaxy Redshift Survey
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In astronomy, the 2dF Galaxy Redshift Survey (Two-degree-Field Galaxy Redshift Survey), 2dF or 2dFGRS is a redshift survey conducted by the Australian Astronomical Observatory (AAO) with the 3.9m Anglo-Australian Telescope between 1997 and 11 April 2002.[1] The data from this survey were made public on 30 June 2003. The survey determined the large-scale structure in two large slices of the Universe to a depth of around 2.5 billion light years (redshift ~ 0.2). It was the world's largest redshift survey between 1998 (overtaking Las Campanas Redshift Survey) and 2003 (overtaken by the Sloan Digital Sky Survey). Matthew Colless, Richard Ellis, Steve Maddox and John Peacock were in charge of the project. Team members Shaun Cole and John Peacock were awarded a share of the 2014 Shaw Prize in astronomy for results from the 2dFGRS.
Description
The 2dF survey covered an area of about 1500
The areas selected for observation were previously surveyed by the massive APM Galaxy Survey (on which Steve Maddox also worked).[2] The regions surveyed cover roughly 75 degrees of right ascension for both bands, and the declination of the North Polar band was about 7.5 degrees while the declination of the South Polar band was about 15 degrees. Hundreds of isolated two degree fields near the South Polar band were also surveyed (see this illustration, where black circles represent survey fields, and the red grid represents the earlier APM survey).
In total, the
The survey was carried out with the 4 metre
The limiting apparent magnitude of the survey is 19.5, covering objects with a
Survey results
The principal results obtained for the field of cosmology by the 2dF survey are:
- The measurement of the neutrinos)
- The detection of Baryon acoustic oscillations, and as a consequence the relationship between the density of baryonic matter and dark matter
- Limits on the contribution of massive neutrinos to dark matter, putting a limit on the sum of the masses of the three families of neutrinos at 1.8 eV.
All these results are in agreement with the measurements of other experiments, notably those of
The 2dF survey also yields a unique view on our local cosmic environment. In the figure a 3-D reconstruction of the inner parts of the survey is shown, revealing a view on the cosmic structures in the nearby universe. Several
See also
References
- ^ Final Status of Survey Observations Archived March 4, 2007, at the Wayback Machine
- ^ a b 2dFGRS − An Introduction Archived 2007-03-04 at the Wayback Machine
- ^ 2dFGRS Summary Statistics Archived 2007-03-04 at the Wayback Machine
- ^ Wall, Mike (2013-01-11). "Largest structure in universe discovered". Fox News.
External links
- Official site of the 2dF Galaxy Redshift Survey
- The 2dF Galaxy Redshift Survey: spectra and redshifts − 2001 Royal Astronomical Society paper describing the survey
- Official site Archived 2014-04-20 at the Wayback Machine of the Two Degree Field instrument system