Probing intermediate Seyfert galaxies by Pa(beta) spectroscopy

Details Probing intermediate Seyfert galaxies by Pa(beta) spectroscopy Probing intermediate Seyfert galaxies by Pa(beta) spectroscopy

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...363..480r&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 363, Nov. 10, 1990, p. 480-487.

Astronomy and Astrophysics

Astrophysics

56

Astronomical Spectroscopy, Seyfert Galaxies, Active Galactic Nuclei, Balmer Series, H Lines, Interstellar Extinction, Markarian Galaxies, Radiative Transfer

Scientific paper

High-resolution spectroscopy at Pa(beta) of a sample of nearby Seyfert galaxies is presented. These objects have been selected because of their observed steep Balmer decrements. The usefulness of Pa(beta) in untangling whether dust obscuration or radiative transfer effects cause the large observed H-alpha/H-beta ratio is demonstrated, and it is found that either mechanism can be dominant. In the cases where dust obscuration is present it is found that the dereddened line strengths, relative to the hard X-ray flux, coincide with those found in unreddened objects. A model is proposed for the dust distribution which accounts naturally for the frequency of severely reddened AGNs and their amount of reddening.

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