The dusty, luminous broad-line radio galaxy 3C 109

Details The dusty, luminous broad-line radio galaxy 3C 109 The dusty, luminous broad-line radio galaxy 3C 109

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...278..530r&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 278, March 15, 1984, p. 530-535.

Astronomy and Astrophysics

Astronomy

21

Astronomical Photometry, Cosmic Dust, Infrared Astronomy, Polarimetry, Radio Galaxies, Galactic Nuclei, Interstellar Extinction, Quasars, Seyfert Galaxies

Scientific paper

In the present optical polarimetry and IR photometry for the broad line radio galaxy 3C 109, the absence of variability, in conjunction with a polarization in H-alpha that is identical to that of the adjacent continuum, suggests that the strong polarization of this galaxy is due to extinction by aligned dust grains. This is the process which gives rise to interstellar polarization within the Galaxy. The energy output of 3C 109, from the optical to 20 microns, exceeds by a factor of 2-4 that of the Seyfert 1 galaxy Markarian 231. These observations, together with recent polarimetry of other broad line radio galaxies, indicate that their broad line regions are more heavily reddened than those of either the Seyfert 1 galaxies or quasars. Evidence for a gradual decrease in dust content with increasing source luminosity is discussed.

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