A Caltech Library Service

The 2dF Galaxy Redshift Survey: spectra and redshifts

Colless, Matthew and Dalton, Gavin and Maddox, Steve and Sutherland, Will and Norberg, Peder and Cole, Shaun and Bland-Hawthorn, Joss and Bridges, Terry and Cannon, Russell and Collins, Chris and Couch, Warrick and Cross, Nicholas and Deeley, Kathryn and De Propris, Roberto and Driver, Simon P. and Efstathiou, George and Ellis, Richard S. and Frenk, Carlos S. and Glazebrook, Karl and Jackson, Carole and Lahav, Ofer and Lewis, Ian and Lumsden, Stuart and Madgwick, Darren and Peacock, John A. and Peterson, Bruce A. and Price, Ian and Seaborne, Mark and Taylor, Keith (2001) The 2dF Galaxy Redshift Survey: spectra and redshifts. Monthly Notices of the Royal Astronomical Society, 328 (4). pp. 1039-1063. ISSN 0035-8711. doi:10.1046/j.1365-8711.2001.04902.x.

[img] PDF - Published Version
See Usage Policy.

[img] PDF - Accepted Version
See Usage Policy.


Use this Persistent URL to link to this item:


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° 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 80° x 15° around the SGP, and the other in the northern Galactic hemisphere spanning 75° x 10° along the celestial equator; in addition, there are 99 fields spread over the southern Galactic cap. The survey covers 2000 deg² 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-8000Å at a two-pixel resolution of 9.0Å and a median S/N of 13 pixel⁻¹. 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⁻¹. 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 this http URL:

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Colless, Matthew0000-0001-9552-8075
Norberg, Peder0000-0002-5875-0440
Bland-Hawthorn, Joss0000-0001-7516-4016
Ellis, Richard S.0000-0001-7782-7071
Alternate Title:The 2dFGRS Galaxy Redshift Survey: Spectra and redshifts
Additional Information:© 2001 RAS. Accepted 2001 August 9. Received 2001 July 30. The 2dF Galaxy Redshift Survey was made possible through the dedicated efforts of the staff of the Anglo-Australian Observatory, both in creating the 2dF instrument and in supporting the survey observations.
Subject Keywords:surveys, galaxies: clusters: general, galaxies: distances and redshifts, cosmology: observations, large-scale structure of Universe
Issue or Number:4
Record Number:CaltechAUTHORS:20200601-103014242
Persistent URL:
Official Citation:Matthew Colless, Gavin Dalton, Steve Maddox, Will Sutherland, Peder Norberg, Shaun Cole, Joss Bland-Hawthorn, Terry Bridges, Russell Cannon, Chris Collins, Warrick Couch, Nicholas Cross, Kathryn Deeley, Roberto de Propris, Simon P. Driver, George Efstathiou, Richard S. Ellis, Carlos S. Frenk, Karl Glazebrook, Carole Jackson, Ofer Lahav, Ian Lewis, Stuart Lumsden, Darren Madgwick, John A. Peacock, Bruce A. Peterson, Ian Price, Mark Seaborne, Keith Taylor, The 2dF Galaxy Redshift Survey: spectra and redshifts, Monthly Notices of the Royal Astronomical Society, Volume 328, Issue 4, December 2001, Pages 1039–1063,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:103591
Deposited By: George Porter
Deposited On:01 Jun 2020 20:38
Last Modified:16 Nov 2021 18:23

Repository Staff Only: item control page