Hubble ratio and solar motion from 200 spiral galaxies having distances derived from the luminosity index

Details Hubble ratio and solar motion from 200 spiral galaxies having distances derived from the luminosity index Hubble ratio and solar motion from 200 spiral galaxies having distances derived from the luminosity index

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...248..395d&link_type=abstract

Astrophysical Journal, Part 1, vol. 248, Sept. 1, 1981, p. 395-407.

Astronomy and Astrophysics

Astrophysics

56

Celestial Mechanics, Hubble Constant, Spiral Galaxies, Stellar Motions, Sun, Astronomical Coordinates, Background Radiation, Cosmology, Red Shift, Solar Position, Velocity Distribution

Scientific paper

New solutions for the motion of the sun are presented with respect to an all-sky sample of 200 spiral galaxies, having precise distance moduli derived from optical tertiary indicators. The solutions show that: (1) the solar motion relative to the frame of reference defined by the galaxies in the interval 2-32 Mpc is 340 + or - 60 km/sec toward galactic coordinates 125 deg + or - 16 deg, +24 deg + or - 8 deg; (2) after correction for solar motion in the Local Group, the motion of the Group is 255 km/sec toward 84 deg, -16 deg, which is displaced 25 deg to the northeast of the Virgo cluster; (3) the mean Hubble ratio is nearly constant at 96 km/sec/Mpc, independent of distance in the same interval; and (4) the velocity dispersion of 200 km/sec is greater than in the Local Group, where the dispersion is only 50 km/sec, reflecting the presence of higher-order terms in the velocity field rather than individual random processes.

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