Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979aj.....84..735p&link_type=abstract
Astronomical Journal, vol. 84, June 1979, p. 735-743.
Astronomy and Astrophysics
Astronomy
48
Disks (Shapes), Galactic Clusters, Galactic Structure, Size Determination, Virgo Galactic Cluster, Absorption Spectra, Astronomical Catalogs, Luminous Intensity, Quasars
Scientific paper
Preliminary results are reported for an investigation aimed at determining the galaxy size for disk systems located in the Virgo and Hercules clusters of galaxies. Measured surface-brightness distributions are used to compute isophotal radii for 32 disk galaxies in Virgo and 29 such galaxies in Hercules. Comparison of the derived angular diameters with those obtained by Holmberg (1958) for nine of the galaxies studied shows that the measured angular diameters of the isophotes to a surface brightness of 26.6 mag/sq arcsec are identical to within 0.02 dex (m.e.) to those of Holmberg. The results indicate that at constant absolute B magnitude the radii of the Hercules disks appear to be significantly larger (by 0.12 dex) than those of the Virgo sample. Possible reasons are considered for the apparent difference in size between the Virgo and Hercules disk galaxies.
Peterson Bradley. M.
Strom Karen M.
Strom Stephen E.
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