Galaxy groups in the 2dFGRS: the group-finding algorithm and the 2PIGG catalogue
Creators
- Eke, V. R.1
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Baugh, Carlton M.1
- Cole, Shaun1
- Frenk, Carlos S.1
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Norberg, Peder2
- Peacock, John A.3
- Baldry, Ivan K.4
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Bland-Hawthorn, Joss
- Bridges, Terry
- Cannon, Russell
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Colless, Matthew5
- Collins, Chris6
- Couch, Warrick7
- Dalton, Gavin8, 9
- De Propris, Roberto5
- Driver, Simon P.5
- Efstathiou, George10
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Ellis, Richard S.11
- Glazebrook, Karl4
- Jackson, Carole5
- Lahav, Ofer10
- Lewis, Ian8
- Lumsden, Stuart12
- Maddox, Steve13
- Madgwick, Darren14
- Peterson, Bruce A.5
- Sutherland, Will3
- Taylor, Keith11
- 2dFGRS Team
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1.
Durham University
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2.
ETH Zurich
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3.
University of Edinburgh
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4.
Johns Hopkins University
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5.
Australian National University
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6.
Liverpool John Moores University
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7.
UNSW Sydney
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8.
University of Oxford
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9.
Rutherford Appleton Laboratory
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10.
University of Cambridge
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11.
California Institute of Technology
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12.
University of Leeds
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13.
University of Nottingham
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14.
University of California, Berkeley
Abstract
The construction of a catalogue of galaxy groups from the Two-degree Field Galaxy Redshift Survey (2dFGRS) is described. Groups are identified by means of a friends-of-friends percolation algorithm which has been thoroughly tested on mock versions of the 2dFGRS generated from cosmological N-body simulations. The tests suggest that the algorithm groups all galaxies that it should be grouping, with an additional 40 per cent of interlopers. About 55 per cent of the ∼190 000 galaxies considered are placed into groups containing at least two members of which ∼29 000 are found. Of these, ∼7000 contain at least four galaxies, and these groups have a median redshift of 0.11 and a median velocity dispersion of 260 km s⁻¹. This 2dFGRS Percolation-Inferred Galaxy Group (2PIGG) catalogue represents the largest available homogeneous sample of galaxy groups. It is publicly available on the World Wide Web.
Additional Information
© 2004 RAS. Accepted 2003 November 6. Received 2003 October 31; in original form 2003 August 11. VRE and CMB are Royal Society University Research Fellows. JAP is grateful for a PPARC Senior Research Fellowship.Attached Files
Published - 348-3-866.pdf
Accepted Version - 0402567.pdf
Files
0402567.pdf
Additional details
Identifiers
- Eprint ID
- 104288
- Resolver ID
- CaltechAUTHORS:20200708-151733246
Related works
Funding
- Royal Society
- Particle Physics and Astronomy Research Council (PPARC)
Dates
- Created
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2020-07-10Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field