Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...248l...9v&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 248, Aug. 15, 1981, p. L9-L11.
Astronomy and Astrophysics
Astronomy
17
Astronomical Photometry, Brightness, Galactic Radiation, Infrared Astronomy, Spiral Galaxies, Andromeda Galaxy, Calibrating, Galactic Clusters, Luminous Intensity
Scientific paper
It is shown that absolute magnitudes of spiral galaxies predicted from their infrared surface brightness (sigma) have standard deviations of only 0.94 mag. M31 and M33 are used as calibrators for the sigma versus M(H) relation in the Virgo cluster, which yields H(local) = 49 and 62 km/s/Mpc from M31 and M33, respectively. Aaronson's et al. (1980) calibration of the observations in four distant clusters yields H(global) = 92 and 115 km/s/Mpc from M31 and M33, respectively. The infrared surface brightness data suggest that the Virgo cluster is at 1.86 + or - 0.14(m.e.) times the distance suggested by its redshift. The result indicates a large local velocity perturbation, which might be explained by assuming that (1) Virgo galaxies are more compact than those in the four more distant clusters that have so far been studied, or (2) that some problem exists with the photometry and/or diameter determinations of galaxies in at least two of the distant clusters studied by Aaronson et al.
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