Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....64..379t&link_type=abstract
Astronomy and Astrophysics, vol. 64, no. 3, Mar. 1978, p. 379-388. Research supported by the Suomen Kulttuurirahasto and Suomen
Astronomy and Astrophysics
Astrophysics
12
Galactic Structure, Interstellar Extinction, Photoabsorption, Spiral Galaxies, Anisotropy, Luminous Intensity, Red Shift
Scientific paper
Observations using the Hubble moduli (HM) and color-luminosity correlation reveal a 0.4 mag slope in the cosecant diagram towards the Orion arm. In the other (center) direction, a smaller absorption in front of the sample galaxies is observed. Other extinction determinations are made using HM and B-V. The difference obtained by subtracting the radio magnitude m21 from the optical magnitude is also presented as an absorption indicator, and reveals an even steeper slope toward the Orion arm. It is suggested that a selection effect may be responsible for the discrepancies. It is further suggested that the Rubin-Ford anisotropy is caused not by galactic motion, but by galactic absorption.
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