Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...149..482b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 149, no. 2, Aug. 1985, p. 482-486.
Astronomy and Astrophysics
Astrophysics
6
Astrometry, Galactic Clusters, Infrared Spectra, Position (Location), Spectral Line Width, Spiral Galaxies, Brightness Distribution, Centimeter Waves, Diameters, Environments, Surface Properties, Virgo Galactic Cluster
Scientific paper
The distance-independent relation between the 21-cm line width, and the infrared surface brightness of spiral galaxies has been found to differ in a variety of environments. Not only are there cluster-to-cluster differences (Kraan-Korteweg, 1983), but there are also differences between cluster and field galaxies, and among the field galaxies themselves. It can be argued that the use of optical diameters to calculate infrared surface brightnesses, or even infrared magnitudes, is responsible for this, and that diameters of spiral galaxies could be systematically different in different environnments. A further correlation between the blue-infrared color (B-H) and the 21-cm line widths shows similar differences, and the residuals of both correlations are correlated themselves. For a given 21-cm line width, bluer galaxies have lower surface brightnesses. Several implications of this are briefly discussed.
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