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Galaxy groups in the Two-degree Field Galaxy Redshift Survey: the luminous content of the groups

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

In: Monthly Notices of the Royal Astronomical Society, 2004, vol. 355, no. 3, p. 769-784

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    Titre
    • Galaxy groups in the Two-degree Field Galaxy Redshift Survey: the luminous content of the groups
    Auteur
    • Eke, V. R.. 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
    • 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
    • Norberg, Peder. ETHZ Institut für Astronomie, HPF G3.1, ETH Hönggerberg, CH-8093 Zürich, Switzerland
    • Peacock, John A.. Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ
    • Baldry, Ivan K.. Department of Physics & Astronomy, Johns Hopkins University, Baltimore, MD 21218-2686, USA
    • Bland-Hawthorn, Joss. Anglo-Australian Observatory, PO Box 296, Epping, NSW 2121, Australia
    • Bridges, Terry. Anglo-Australian Observatory, PO Box 296, Epping, NSW 2121, Australia
    • Cannon, Russell. Anglo-Australian Observatory, PO Box 296, Epping, NSW 2121, Australia
    • Colless, Matthew. Research School of Astronomy and Astrophysics, The Australian National University, Canberra, ACT 2611, Australia
    • Collins, Chris. Astrophysics Research Institute, Liverpool John Moores University, 12 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
    • De Propris, Roberto. Department of Astrophysics, University of New South Wales, Sydney, NSW 2052, Australia
    • Driver, Simon P.. Research School of Astronomy and Astrophysics, The Australian National University, Canberra, 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 91125, USA
    • Glazebrook, Karl. Department of Physics & Astronomy, Johns Hopkins University, Baltimore, MD 21218-2686, USA
    • Jackson, Carole A.. Research School of Astronomy and Astrophysics, The Australian National University, Canberra, 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 J.. School of Physics & 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, Canberra, ACT 2611, Australia
    • Sutherland, Will. Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX
    • Taylor, Keith. Department of Astronomy, California Institute of Technology, Pasadena, CA 91125, USA
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Monthly Notices of the Royal Astronomical Society, 2004, vol. 355, no. 3, p. 769-784. Blackwell Science Ltd
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:291723
    Summary
    The Two-degree Field Galaxy Redshift Survey (2dFGRS) Percolation-Inferred Galaxy Group (2PIGG) catalogue of ∼29 000 objects is used to study the luminous content of galaxy systems of various sizes. Mock galaxy catalogues constructed from cosmological simulations are used to gauge the accuracy with which intrinsic group properties can be recovered. It is found that a Schechter function is a reasonable fit to the galaxy luminosity functions in groups of different mass in the real data, and that the characteristic luminosity L⋆ is slightly larger for more massive groups. However, the mock data show that the shape of the recovered luminosity function is expected to differ from the true shape, and this must be allowed for when interpreting the data. Luminosity function results are presented in both the bJ and rF wavebands. The variation of the halo mass-to-light ratio, ϒ, with group size is studied in both of these wavebands. A robust trend of increasing ϒ with increasing group luminosity is found in the 2PIGG data. Going from groups with bJ luminosities equal to 1010h−2 L⊙ to those 100 times more luminous, the typical bJ-band mass-to-light ratio increases by a factor of 5, whereas the rF-band mass-to-light ratio grows by a factor of 3.5. These trends agree well with the predictions of the simulations which also predict a minimum in the mass-to-light ratio on a scale roughly corresponding to the Local Group. The data indicate that if such a minimum exists, then it must occur at L≲ 1010h−2 L⊙, below the range accurately probed by the 2PIGG catalogue. According to the mock data, the bJ mass-to-light ratios of the largest groups are expected to be approximately 1.1 times the global value. Assuming that this correction applies to the real data, the mean bJ luminosity density of the Universe yields an estimate of Ωm= 0.26 ± 0.03 (statistical error only). Various possible sources of systematic error are considered, with the conclusion that these could affect the estimate of Ωm by a few tens of per cent