NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-07-21 T08:22:17 PDT
Help | Comment | NED Home

For refcode 1997MNRAS.287..425W:
Retrieve 10 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by Royal Astronomical Society. 1997MNRAS.287..425W Wiener reconstruction of the IRAS 1.2-Jy galaxy redshift survey: cosmographical implications Matthew Webster, Ofer Lahav and Karl Fisher Accepted 1997 January 9. Received 1996 December 19; in original form 1996 July 17 ABSTRACT We utilize the method of Wiener reconstruction with spherical harmonics and Bessel functions to recover the density and velocity fields from the IRAS 1.2-Jy redshift survey. The reconstruction relies on prior knowledge of the IRAS power spectrum and the combination of density and bias parameters {beta} =- {OMEGA}^0.6^/b. The results are robust to changes in these prior parameters and the number of expansion coefficients. Maps of these fields are presented in a variety of projections. Many known structures are observed, including clear confirmations of the clusters N1600 and A3627. The Perseus-Pisces supercluster appears to extend out to ~9000 km s^-1^, and the reconstruction shows `backside infall' to the Centaurus/Great Attractor region. A qualitative comparison of the reconstructed IRAS gravity field with that from Tully-Fisher peculiar velocity measurements (Mark III) shows reasonable agreement. The Wiener reconstruction of the density field is also the optimal reconstruction (in the minimum-variance sense) of any quantity which is linear in the density contrast. We show reconstructions of three such quantities. The misalignment angle between the IRAS and cosmic microwave background local Group dipoles is only 13^deg^ out to 5000 km s^-1^ but increases to 25^deg^ out to 20000 km s^- 1^. The reconstructed IRAS bulk flow out to 5000 km s^-1^ is ~300 km s^- 1^, which agrees in amplitude with that derived from the Mark III peculiar velocities (~370 km s^-1^), However, the two bulk flow vectors deviate by ~70^deg^. Finally, moment of inertia analysis shows that the Wiener reconstructed Supergalactic Plane is aligned within ~30^deg^ of that defined by de Vaucouleurs. Key words: methods: data analysis - galaxies: clusters: general - galaxies: distances and redshifts - cosmic microwave background - large- scale structure of Universe - infrared: galaxies.
Retrieve 10 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home