WIENER RECONSTRUCTION OF THE IRAS 1.2-JY GALAXY REDSHIFT SURVEY - COSMOGRAPHICAL IMPLICATIONS

We utilize the method of Wiener reconstruction with spherical harmonic s and Bessel functions to recover the density and velocity fields from the IRAS 1.2-Jy redshift survey. The reconstruction relies on prior k nowledge of the IRAS power spectrum and the combination of density and bias parameters beta = Omega(0.6)/b. The results are robust to change s in these prior parameters and the number of expansion coefficients. Maps of these fields are presented in a variety of projections. Many k nown structures are observed, including clear confirmations of the clu sters N1600 and A3627. The Perseus-Pisces supercluster appears to exte nd out to similar to 9000 km s(-1), and the reconstruction shows 'back side infall' to the Centaurus/Great Attractor region. A qualitative co mparison of the reconstructed IRAS gravity field with that from Tully- Fisher peculiar velocity measurements (Mark III) shows reasonable agre ement. The Wiener reconstruction of the density field is also the opti mal reconstruction (in the minimum-variance sense) of any quantity whi ch is linear in the density contrast. We show reconstructions of three such quantities. The misalignment angle between the IRAS and cosmic m icrowave background Local Group dipoles is only 13 degrees out to 5000 km s(-1) but increases to 25 degrees out to 20 000 km s(-1). The reco nstructed IRAS bulk flow out to 5000 km s(-1) is similar to 300 km s(- 1), which agrees in amplitude with that derived from the Mark III pecu liar velocities (similar to 370 km s(-1)). However, the two bulk flow vectors deviate by similar to 70 degrees. Finally, moment of inertia a nalysis shows that the Wiener reconstructed Supergalactic Plane is ali gned within similar to 30 degrees of that defined by de Vaucouleurs.