Effects of Distance Uncertainties on Determinations of the Galaxy Peculiar Velocity Field | Zendy

Nelson Padilla | Zendy; Manuel Merchán | Zendy; D. G. Lambas | Zendy

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Effects of Distance Uncertainties on Determinations of the Galaxy Peculiar Velocity Field

Author(s) -

Nelson Padilla,

Manuel Merchán,

D. G. Lambas

Publication year - 1998

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/306114

Subject(s) - physics , galaxy , astrophysics , homogeneity (statistics) , relative velocity , peculiar velocity , radius , consistency (knowledge bases) , offset (computer science) , statistical physics , statistics , redshift , classical mechanics , mathematics , geometry , programming language , computer security , computer science

Our statistical studies comprise the mean relative velocity and velocitycorrelation for pairs of galaxies as a function of separation, and a bulk flowanalysis determined on spheres of $10 h^{-1}$ $Mpc$ radius. In order to testthe statistical analysis we use COBE normalized CDM numerical simulations withdifferent density parameters and cosmological constant and take into accountthe Tully-Fisher (TF) scatter and a possible TF zero-point offset, as well asvariations in the results of the simulations arising from different observerpositions. We compare the results of the mock catalogs with samples of spiralgalaxies taken from the Mark III catalog.Comment: 18 pages, 6 figures, to appear in Ap

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