The infrared luminosity-H I profile width-surface brightness relation, and the cosmological expansion

Details The infrared luminosity-H I profile width-surface brightness relation, and the cosmological expansion The infrared luminosity-H I profile width-surface brightness relation, and the cosmological expansion

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982pazh....8..643j&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 8, Nov. 1982, p. 643-648) Soviet Astronomy Letters (ISSN 0360-0327), vol. 8, Nov.-Dec.

Astronomy and Astrophysics

Astronomy

Big Bang Cosmology, Cosmology, H Lines, Infrared Spectra, Spiral Galaxies, Astrometry, Centimeter Waves, Distance, Hubble Constant, Hydrogen, Luminosity, Spatial Distribution, Spectral Line Width, Surface Properties, Virgo Galactic Cluster

Scientific paper

From observational data given by Aaronson et al. (1980) for groups and clusters of galaxies, a relation involving the H-band infrared absolute magnitude, the width of the 21-cm H I line profile, and the H surface brightness is derived which predicts the luminosity of spiral galaxies to whithin + or 0.3 m. The spread in the individual Hubble-constant values for clusters whose distances are estimated from this IR/H I/S(H) relation cannot be explained by a simple infall of the Local Group toward the Virgo cluster. Either galaxy clusters have peculiar velocities greater than or approximately equal to 500 km/sec. or the infrared magnitude scales (or galaxy diameter calibrations) in different directions are inconsistent, or some third parameter having different mean values in different clusters also should be considered when predicting luminosities.

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