Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...268..591g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 268, May 15, 1983, p. 591-601.
Astronomy and Astrophysics
Astrophysics
54
Astronomical Spectroscopy, H Lines, Interstellar Extinction, Quasars, Seyfert Galaxies, Spectral Line Width, Emission Spectra, Interstellar Gas, Molecular Clouds, Spectrophotometry
Scientific paper
It is pointed out that a determination of the reddening caused by intervening dust is a prerequisite to understanding the astrophysics of the broad line emission in quasars and their close cousins Seyfert 1 galaxies. Previous discussions of the reddening question have tended to be incomplete. The present investigation represents an attempt to asses critically the various techniques used to measure the reddening to quasars. It is found that if certain arguments presented are correct, there are no useful reddening indicators for the broad lines of quasars and Seyfert 1 galaxies. It seems safest to assume that reddening due to dust associated with quasars is negligible. However, small amounts of reddening toward quasars are certainly possible, and large amounts of reddening, while unlikely, cannot be ruled out.
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