Spectroscopy and photometry of elliptical galaxies - A large-scale streaming motion in the local universe

Details Spectroscopy and photometry of elliptical galaxies - A large-scale streaming motion in the local universe Spectroscopy and photometry of elliptical galaxies - A large-scale streaming motion in the local universe

Feb 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...313l..37d&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 313, Feb. 15, 1987, p. L37-L42. Research supported

Astronomy and Astrophysics

Astronomy

354

Astronomical Photometry, Astronomical Spectroscopy, Cosmology, Elliptical Galaxies, Local Group (Astronomy), Background Radiation, Distance, Microwaves, Red Shift, Velocity

Scientific paper

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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