Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-06-27
Mon.Not.Roy.Astron.Soc.328:1039,2001
Astronomy and Astrophysics
Astrophysics
accepted by MNRAS; version with high-resolution figures at http://www.mso.anu.edu.au/2dFGRS/Public/Publications; accompanies t
Scientific paper
10.1046/j.1365-8711.2001.04902.x
The 2dF Galaxy Redshift Survey (2dFGRS) is designed to measure redshifts for approximately 250000 galaxies. This paper describes the survey design, the spectroscopic observations, the redshift measurements and the survey database. The 2dFGRS uses the 2dF multi-fibre spectrograph on the Anglo-Australian Telescope, which is capable of observing 400 objects simultaneously over a 2-degree diameter field. The source catalogue for the survey is a revised and extended version of the APM galaxy catalogue, and the targets are galaxies with extinction-corrected magnitudes brighter than b_J=19.45. The main survey regions are two declination strips, one in the southern Galactic hemisphere spanning 80deg x 15deg around the SGP, and the other in the northern Galactic hemisphere spanning 75deg x 10deg along the celestial equator; in addition, there are 99 fields spread over the southern Galactic cap. The survey covers 2000 sq.deg and has a median depth of z=0.11. Adaptive tiling is used to give a highly uniform sampling rate of 93% over the whole survey region. Redshifts are measured from spectra covering 3600A-8000A at a two-pixel resolution of 9.0A and a median S/N of 13 per pixel. All redshift identifications are visually checked and assigned a quality parameter Q in the range 1-5; Q>=3 redshifts are 98.4% reliable and have an rms uncertainty of 85 km/s. The overall redshift completeness for Q>=3 redshifts is 91.8%, but this varies with magnitude from 99% for the brightest galaxies to 90% for objects at the survey limit. The 2dFGRS database is available on the WWW at http://www.mso.anu.edu.au/2dFGRS
Bland-Hawthorn Jonathan
Bridges Terry James
Cannon Russell D.
Cole Shaun
Colless Matthew
No associations
LandOfFree
The 2dF Galaxy Redshift Survey: Spectra and redshifts does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The 2dF Galaxy Redshift Survey: Spectra and redshifts, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The 2dF Galaxy Redshift Survey: Spectra and redshifts will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-405978