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The IRAS PSCz dipole |
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| Authors: | M Rowan-Robinson J Sharpe S J Oliver O Keeble A Canavezes W Saunders A N Taylor H Valentine C S Frenk G P Efstathiou R G McMahon S D M White W Sutherland H Tadros S Maddox |
| Institution: | Astrophysics Group, Imperial College London, Blackett Laboratory, Prince Consort Road, London SW7 2BZ; Institute for Astronomy, Blackford Hill, Edinburgh EH9 3RJ; Department of Physics, University of Durham, Durham DH1 3LE; Institute of Astronomy, Madingley Road, Cambridge CB3 0HA; Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Strasse 1, D-85740 Garching bei München, Germany; Nuclear and Astrophysics Laboratory, Keble Road, Oxford OX1 3RH; School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD |
| Abstract: | We use the PSC z IRAS galaxy redshift survey to analyse the cosmological galaxy dipole out to a distance of 300 h The conversion from redshift space to real space is accomplished by using an analytical model of the cluster and void distribution, based on 88 nearby groups, 854 clusters and 163 voids, with some of the clusters and all of the voids found from the PSC z data base. The dipole for the whole PSC z sample appears to have converged within a distance of 200 h The direction of the dipole is within 13° of the cosmic microwave background (CMB) dipole, the main uncertainty in direction being associated with the masked area behind the Galactic plane. The improbability of further major contributions to the dipole amplitude coming from volumes larger than those surveyed here means that the question of the origin of the CMB dipole is essentially resolved. |
| Keywords: | galaxies: clusters: general cosmic microwave background largescale structure of Universe infrared: galaxies |