New measurements of distances to spirals in the great attractor - Further confirmation of the large-scale flow

Details New measurements of distances to spirals in the great attractor - Further confirmation of the large-scale flow New measurements of distances to spirals in the great attractor - Further confirmation of the large-scale flow

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...354l..45d&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 354, May 10, 1990, p. L45-L48.

Astronomy and Astrophysics

Astrophysics

53

Astronomical Photometry, Distance, H Alpha Line, Spiral Galaxies, Charge Coupled Devices, Hubble Diagram, Radial Velocity

Scientific paper

H-alpha rotation curves and CCD photometry have been obtained for 117 Sb-Sc spiral galaxies in the direction of the large-scale streaming flow. By means of the Tully-Fisher relation, these data are used to predict distances to these galaxies and, by comparison with their observed radial velocities, their peculiar motions relative to a smooth Hubble flow. The new data confirm the results of the earlier studies of a coherent flow pattern in a large region called the 'great attractor'. For the first time, evidence is found for backside infall into the great attractor. Taken as a whole, the data sets for E, S0, and spiral galaxies support the model proposed by Lynden-Bell et al. (1988) of a large, extended overdensity centered at about 45/h Mpc that perturbs the Hubble flow over a region less than about 100/h Mpc in diameter. Observation of the full 's-wave' in the Hubble flow establishes this scale for the structure, providing a strong constraint for models of structure formation, like those based on hot or cold dark matter.

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