Radial velocities of isolated galaxies

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astronomical Catalogs, Galactic Rotation, Radial Velocity, Accuracy, Dimensions

Scientific paper

Radial velocities, linear dimensions and absolute magnitudes are presented for 102 isolated galaxies in the Catalog of Isolated Galaxies compiled by Karachentseva (1973). Radial velocities were determined for those galaxies with major axes greater than or equal to 2 arcmin and photographic magnitudes less than or equal to 13.9 to an accuracy of approximately 50 km/sec. The linear dimensions were calculated on the basis of their angular diameters reduced to the 25 magnitudes/sq arcsec isophote and corrected for declination and galactic absorption, and absolute magnitudes were calculated from their apparent magnitudes corrected for galactic absorption. From an examination of the list, it is noted that none of the observed isolated galaxies has a negative radial velocity, most are normal spirals with narrow emission lines of moderate intensity, and about 15% of the objects are very extended galaxies with diameters from 50 to 100 kpc.

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