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Galaxy groups in the 2dFGRS: the group-finding algorithm and the 2PIGG catalogue

Eke, V. R. ; Baugh, Carlton M. ; Cole, Shaun ; Frenk, Carlos S. ; Norberg, Peder ; Peacock, John A. ; Baldry, Ivan K. ; Bland-Hawthorn, Joss ; Bridges, Terry ; Cannon, Russell ; Colless, Matthew ; Collins, Chris ; Couch, Warrick ; Dalton, Gavin ; Propris, Roberto De ; Driver, Simon P. ; Efstathiou, George ; Ellis, Richard S. ; Glazebrook, Karl ; Jackson, Carole ; Lahav, Ofer ; Lewis, Ian ; Lumsden, Stuart ; Maddox, Steve ; Madgwick, Darren ; Peterson, Bruce A. ; Sutherland, Will ; Taylor, Keith

In: Monthly Notices of the Royal Astronomical Society, 2004, vol. 348, no. 3, p. 866-878

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    Titre
    • Galaxy groups in the 2dFGRS: the group-finding algorithm and the 2PIGG catalogue
    Auteur
    • Eke, V. R.. Department of Physics, University of Durham, South Road, Durham DH1 3LE
    • Baugh, Carlton M.. Department of Physics, University of Durham, South Road, Durham DH1 3LE
    • Cole, Shaun. Department of Physics, University of Durham, South Road, Durham DH1 3LE
    • Frenk, Carlos S.. Department of Physics, University of Durham, South Road, Durham DH1 3LE
    • Norberg, Peder. ETHZ Institut fur Astronomie, HPF G3.1, ETH Honggerberg, CH-8093 Zurich, Switzerland
    • Peacock, John A.. Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ
    • Baldry, Ivan K.. Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21118-2686, USA
    • Bland-Hawthorn, Joss. Anglo-Australian Observatory, PO Box 296, Epping, NSW 2111, Australia
    • Bridges, Terry. Anglo-Australian Observatory, PO Box 296, Epping, NSW 2111, Australia
    • Cannon, Russell. Anglo-Australian Observatory, PO Box 296, Epping, NSW 2111, Australia
    • Colless, Matthew. Research School of Astronomy and Astrophysics, The Australian National University, Weston Creek, ACT 2611, Australia
    • Collins, Chris. Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Birkenhead L14 1LD
    • Couch, Warrick. Department of Astrophysics, University of New South Wales, Sydney, NSW 2052, Australia
    • Dalton, Gavin. Department of Physics, University of Oxford, Keble Road, Oxford OX1 3RH
    • Propris, Roberto De. Research School of Astronomy and Astrophysics, The Australian National University, Weston Creek, ACT 2611, Australia
    • Driver, Simon P.. Research School of Astronomy and Astrophysics, The Australian National University, Weston Creek, ACT 2611, Australia
    • Efstathiou, George. Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA
    • Ellis, Richard S.. Department of Astronomy, California Institute of Technology, Pasadena, CA 91025, USA
    • Glazebrook, Karl. Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21118-2686, USA
    • Jackson, Carole. Research School of Astronomy and Astrophysics, The Australian National University, Weston Creek, ACT 2611, Australia
    • Lahav, Ofer. Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA
    • Lewis, Ian. Department of Physics, University of Oxford, Keble Road, Oxford OX1 3RH
    • Lumsden, Stuart. Department of Physics, University of Leeds, Woodhouse Lane, Leeds LS2 9JT
    • Maddox, Steve. School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD
    • Madgwick, Darren. Department of Astronomy, University of California, Berkeley, CA 92720, USA
    • Peterson, Bruce A.. Research School of Astronomy and Astrophysics, The Australian National University, Weston Creek, ACT 2611, Australia
    • Sutherland, Will. Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ
    • Taylor, Keith. Department of Astronomy, California Institute of Technology, Pasadena, CA 91025, USA
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Monthly Notices of the Royal Astronomical Society, 2004, vol. 348, no. 3, p. 866-878. Blackwell Science Ltd
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:289690
    Summary
    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