Effects of internal dust on the narrow-line region Lyman and Balmer decrements

Details Effects of internal dust on the narrow-line region Lyman and Balmer decrements Effects of internal dust on the narrow-line region Lyman and Balmer decrements

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...414..535b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 414, no. 2, p. 535-551.

Astronomy and Astrophysics

Astrophysics

40

Balmer Series, Interstellar Extinction, Interstellar Matter, Lyman Spectra, Molecular Clouds, Seyfert Galaxies, H Alpha Line, H Beta Line, Lyman Alpha Radiation, Radiation Distribution

Scientific paper

Detailed calculations on the effects of internal dust on the Balmer and Lyman decrements are presented for a spherically symmetric distribution of low covering factor clouds photoionized by a power law. Consideration is given to the important effects of perspective on the emergent fluxes, which in the present simplified scheme present either the photoionized face to the observer or the back face. For moderate amounts of internal dust, the relative internal dust content by mass (mu) is 0.2-0.3, radiation-bounded clouds result in Lyman and Balmer decrements in the range 32-37 and 3.0-3.1, respectively. Seyfert 2 observations show much lower Lyman decrements than predicted from the spherically symmetric model, and a critical study is made of various explanations. Attention is also given to the possibility that dust reddening of the continuum may account for the apparent deficit of ionizing photons seen in many Seyfert 2s. This reddening may be present in addition to, or in place of, the anisotropic beaming/occultation of ionized radiation that is generally invoked to explain the deficit.

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