Статья

Shellflow. I. The Convergence of the Velocity Field at 6000 Kilometers per Second

Stéphane CourteauNRC/Herzberg Institute of Astrophysics, Victoria, BC; and University of British Columbia, Vancouver BC, CanadaJeffrey A. WillickDeceased. Formerly at Stanford University, Department of Physics, Stanford, CA. We would like to dedicate this paper to the memory of our friend and collaborator Jeffrey Willick (October 8, 1959-June 18, 2000) who died tragically a week after our paper was accepted for publication. The world of astronomy lost a superb scientist; we also lost a very dear friend. We will miss him deeplyMichael A. StraussPrinceton University Observatory, Princeton, NJ 08540David J. SchlegelPrinceton University Observatory, Princeton, NJ 08540Marc PostmanSpace Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218

2000en

ABI

Аннотация

We present the first results from the Shellflow program, an all-sky Tully-Fisher (TF) peculiar velocity survey of 276 Sb-Sc galaxies with redshifts between 4500 and 7000 km/s. Shellflow was designed to minimize systematic errors between observing runs and between telescopes, thereby removing the possibility of a spurious bulk flow caused by data inhomogeneity. A fit to the data yields a bulk flow amplitude V_bulk = 70{+100}{-70} km/s (1 sigma error) with respect to the Cosmic Microwave Background, i.e., consistent with being at rest. At the 95% confidence level, the flow amplitude is < 300 km/s. Our results are insensitive to which Galactic extinction maps we use, and to the parameterization of the TF relation. The larger bulk motion found in analyses of the Mark III peculiar velocity catalog are thus likely to be due to non-uniformities between the subsamples making up Mark III. The absence of bulk flow is consistent with the study of Giovanelli and collaborators and flow field predictions from the observed distribution of IRAS galaxies.

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Идентификаторы

DOI: 10.1086/317234

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