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Title:
Spectroscopy and photometry of elliptical galaxies - A large-scale streaming motion in the local universe
Authors:
Dressler, Alan; Faber, S. M.; Burstein, David; Davies, Roger L.; Lynden-Bell, Donald; Terlevich, R. J.; Wegner, Gary
Affiliation:
AA(Mount Wilson and Las Campanas Observatoires, Pasadena, CA), AB(Lick Observatory; California, University, Santa Cruz), AC(Arizona State University, Tempe, AZ), AD(Kitt Peak National Observatory, Tucson, AZ), AE(Cambridge University Observatoires, England)
Publication:
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 313, Feb. 15, 1987, p. L37-L42. Research supported by University of California, Dartmouth College, Carnegie Institution of Washington, Cambridge University, and South African Astronomical Observatory. (ApJL Homepage)
Publication Date:
02/1987
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
ASTRONOMICAL PHOTOMETRY, ASTRONOMICAL SPECTROSCOPY, COSMOLOGY, ELLIPTICAL GALAXIES, LOCAL GROUP (ASTRONOMY), BACKGROUND RADIATION, DISTANCE, MICROWAVES, RED SHIFT, VELOCITY
DOI:
10.1086/184827
Bibliographic Code:
1987ApJ...313L..37D

Abstract

The authors present results from a study of the distances and velocities of elliptical galaxies out to ≡6000 km s-1. Distances are inferred from a new relation between central velocity dispersion and an angular diameter defined by integrated surface brightness. With this residual velocities Vobs - Vpred from a smooth Hubble flow are estimated. It is found that Vobs - Vpred, in coordinates with respect to the microwave background, exhibits a systematic variation over the celestial sphere. Interpreted as a large-scale bulk flow, this variation implies a mean motion of the ellipticals with respect to the microwave background of 599±104 km s-1 in the direction l = 312°±11°, b = 6°±10°. The data show that if the microwave dipole anisotropy is due to a motion of the Local Group of ≡600 km s-1, as conventionally interpreted, this motion is not primarily the result of gravitational acceleration by local (V < 5000 km s-1) mass concentrations.

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