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Title:
The 2dF Galaxy Redshift Survey: spectra and redshifts
Authors:
Colless, Matthew; Dalton, Gavin; Maddox, Steve; Sutherland, Will; Norberg, Peder; Cole, Shaun; Bland-Hawthorn, Joss; Bridges, Terry; Cannon, Russell; Collins, Chris; Couch, Warrick; Cross, Nicholas; Deeley, Kathryn; De Propris, Roberto; Driver, Simon P.; Efstathiou, George; Ellis, Richard S.; Frenk, Carlos S.; Glazebrook, Karl; Jackson, Carole; Lahav, Ofer; Lewis, Ian; Lumsden, Stuart; Madgwick, Darren; Peacock, John A.; Peterson, Bruce A.; Price, Ian; Seaborne, Mark; Taylor, Keith
Affiliation:
AA(Research School of Astronomy and Astrophysics, The Australian National University, Weston Creek, ACT 2611, Australia ), AB(Department of Physics, University of Oxford, Keble Road, Oxford OX1 3RH ), AC(School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD ), AD(School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife, KY6 9SS ), AE(Department of Physics, University of Durham, South Road, Durham DH1 3LE ), AF(Department of Physics, University of Durham, South Road, Durham DH1 3LE ), AG(Anglo-Australian Observatory, PO Box 296, Epping, NSW 2121, Australia ), AH(Anglo-Australian Observatory, PO Box 296, Epping, NSW 2121, Australia ), AI(Anglo-Australian Observatory, PO Box 296, Epping, NSW 2121, Australia ), AJ(Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Birkenhead L14 1LD ), AK(Department of Astrophysics, University of New South Wales, Sydney, NSW 2052, Australia ), AL(School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife, KY6 9SS ), AM(Department of Astrophysics, University of New South Wales, Sydney, NSW 2052, Australia ), AN(Department of Astrophysics, University of New South Wales, Sydney, NSW 2052, Australia ), AO(School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife, KY6 9SS ), AP(Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA ), AQ(Department of Astronomy, California Institute of Technology, Pasadena, CA 91125, USA ), AR(Department of Physics, University of Durham, South Road, Durham DH1 3LE ), AS(Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218-2686, USA ), AT(Research School of Astronomy and Astrophysics, The Australian National University, Weston Creek, ACT 2611, Australia ), AU(Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA ), AV(Anglo-Australian Observatory, PO Box 296, Epping, NSW 2121, Australia ), AW(Department of Physics, University of Leeds, Woodhouse Lane, Leeds LS2 9JT ), AX(Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA ), AY(Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ), AZ(Research School of Astronomy and Astrophysics, The Australian National University, Weston Creek, ACT 2611, Australia ), BA(Research School of Astronomy and Astrophysics, The Australian National University, Weston Creek, ACT 2611, Australia ), BB(Department of Physics, University of Oxford, Keble Road, Oxford OX1 3RH ), BC(Anglo-Australian Observatory, PO Box 296, Epping, NSW 2121, Australia ; Department of Astronomy, California Institute of Technology, Pasadena, CA 91125, USA )
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 328, Issue 4, pp. 1039-1063. (MNRAS Homepage)
Publication Date:
12/2001
Origin:
MNRAS
MNRAS Keywords:
SURVEYS, GALAXIES: CLUSTERS: GENERAL, GALAXIES: DISTANCES AND REDSHIFTS, COSMOLOGY: OBSERVATIONS, LARGE-SCALE STRUCTURE OF UNIVERSE
DOI:
10.1046/j.1365-8711.2001.04902.x
Bibliographic Code:
2001MNRAS.328.1039C

Abstract

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 data base. The 2dFGRS uses the 2dF multifibre 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 bJ=19.45. The main survey regions are two declination strips, one in the southern Galactic hemisphere spanning 80°×15° around the SGP, and the other in the northern Galactic hemisphere spanning 75°×10° along the celestial equator; in addition, there are 99 fields spread over the southern Galactic cap. The survey covers 2000deg2 and has a median depth of z=0.11. Adaptive tiling is used to give a highly uniform sampling rate of 93 per cent over the whole survey region. Redshifts are measured from spectra covering 3600-8000Å at a two-pixel resolution of 9.0Å and a median S/N of 13pixel-1. All redshift identifications are visually checked and assigned a quality parameter Q in the range 1-5 Q>=3 redshifts are 98.4 per cent reliable and have an rms uncertainty of 85kms-1. The overall redshift completeness for Q>=3 redshifts is 91.8 per cent, but this varies with magnitude from 99 per cent for the brightest galaxies to 90 per cent for objects at the survey limit. The 2dFGRS data base is available on the World Wide Web at <extlink type="url">http://www.mso.anu.edu.au/2dFGRS.</extlink>

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