2PIGGS in Space: galaxy groups in the 2dFGRS The colour of the dots represent the velocity dispersion and the size of the dot reflects the number of galaxies found in the group. Click here to see a bigger version Introduction to the 2dFGRS at Durham Projects carried out at Durham Related Articles

Introduction to the 2dFGRS: The 2dF Galaxy Redshift Survey (2dFGRS) is a major spectroscopic survey taking full advantage of the unique capabilities of the 2dF facility built by the Anglo-Australian Observatory. The 2dFGRS obtained spectra for 245591 objects, mainly galaxies, brighter than a nominal extinction-corrected magnitude limit of bJ=19.45 and from these managed to obtain reliable redshifts for 221414 galaxies. The galaxies cover an area of approximately 1500 square degrees selected from the extended APM Galaxy Survey in three regions: a North Galactic Pole (NGP) strip, a South Galactic Pole (SGP) strip and random fields scattered around the SGP strip. Click here to see a visual diagram of this arrangement. Using the redshifts of galaxies as a distnace indication allows us to create a 3D map of galaxies within the target regions. Click here to see an image of the distribution of galaxies obtained by 2dFGRS Completed and ongoing 2dFGRS projects at Durham Using the data collected during the 2dFGRS a number of problems in galaxy formation and cosmology have been addressed. Click here for more details. Further information can be found at the principal 2dFGRS website: 2dFGRS Homepage http://magnum.anu.edu.au/~TDFgg/ Designed and maintained by Stephen Wilkins Last updated Mon 12th September 2005