Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...383l..37w&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 383, Dec. 20, 1991, p. L37-L40.
Astronomy and Astrophysics
Astrophysics
36
Cosmic Dust, Galactic Evolution, Interstellar Matter, Radiation Absorption, Red Shift, Brightness Distribution, Heavy Elements, Magnitude, Spiral Galaxies
Scientific paper
Effects of internal absorption by interstellar dust within galaxies are examined. Observations of spiral galaxies suggest that internal absorption correlates with the luminosity of galaxies; brighter galaxies tend to be dustier. Moreover, galaxies may be more obscured by dust at earlier times because of the large amount of heavy elements available in the interstellar medium. Interstellar obscuration within galaxies thus may have profound consequences in observations of distant galaxies; the galaxy number-magnitude relation, N(m), and the number-redshift relation, N(z), in the B and K bands, are calculated with internal absorption taken into account. It is found that the galaxy number counts and redshift distribution can be plausibly accounted for by the present simple models of galaxy evolution with Omega = 1; inclusion of internal absorption eliminates difficulties previously encountered in simultaneously explaining N(m) and N(z) in the B and K bands.
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