The IRAS view of the Local Universe

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dc.creatorSaunders, Will
dc.creatorD'Mellow, Kenton
dc.creatorValentine, Helen
dc.creatorTully, Brent
dc.creatorCarrasco, Esperanza
dc.creatorMobasher, Bahram
dc.creatorMaddox, Steve
dc.creatorHau, George
dc.creatorSutherland, Will
dc.creatorClements, Dave
dc.creatorStaveley-Smith, Lister
dc.date2000-06-01
dc.date.accessioned2026-07-07T01:53:50Z
dc.date.available2026-07-07T01:53:50Z
dc.descriptionWe summarise results for the predicted density and peculiar velocity fields from the PSCz survey. We have used a generalisation of the Path Interchange Zeldovich Approximation to determine the velocity field; the most remarkable feature being a coherent large-scale flow along the baseline connecting the Local Supercluster, Centaurus and the Shapley Concentration. Comparison of the predicted and observed bulk flows gives a value of beta = 0.50+-0.1. We re-examine the PSCz dipole, with improved redshift completeness at low-latitudes and using PIZA to estimate real-space distances. We find the dipole to be stable between 80 and 180 hMpc, although there appears to be a significant contribution to the dipole around 200 hMpc. The overall misalignment with the CMB dipole remains at 20degrees. The implied value of beta is in the range 0.40-0.55 with statistical error +-0.1. We also present the density field and a preliminary dipole analysis from the almost completed Behind The Plane survey, which extends the PSCz to cover 93% of the sky including the proposed core of the Great Attractor. We find a density peak at (325,-5,3500km/s), about half as massive as Centaurus or Pavo-Indus, and forming part of a continuous filament linking them across the Plane. We also find evidence for a much larger `Greater Attractor' directly behind the GA, at a distance of 125 hMpc, and more massive than the Shapley concentration. At large distances the dipole direction is in much improved agreement with the CMB: at 250-300hMpc, the misalignment is only 5-10 degrees, though this depends on the incompleteness corrections made. The dipole amplitude implies a value for the parameter beta of 0.44+-0.1.
dc.description10 pages. To appear in 'The Hidden Universe', procs Guanajuarto conference 2/00, ASP Conference series, eds R.C. Kraan-Korteweg, P.A. Henning and H. Andernach
dc.identifierhttps://arxiv.org/abs/astro-ph/0006005
dc.identifierhttp://arxiv.org/abs/astro-ph/0006005
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/1113
dc.subjectAstrophysics
dc.titleThe IRAS view of the Local Universe
dc.typetext

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