The strength of Paschen-alpha in the Seyfert 1.9 galaxy V Zwicky 317

Astronomy and Astrophysics – Astronomy

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Galactic Radiation, Infrared Astronomy, Paschen Series, Seyfert Galaxies, Balmer Series, Lyman Alpha Radiation, Near Infrared Radiation

Scientific paper

A search was conducted for Paschen-alpha emissions from the Seyfert 1.9 galaxy V Zwicky 317 to test a hypothesis that steep Balmer line increments are produced by heavy obscuration of the broad-line region. The evidence would then explain a strong differential extinction between H-alpha and H-beta observed where a broad continuum is otherwise expected. Measurements were made with the Multiple Mirror Telescope IR photometer. The data indicated that the Paschen-alpha emission was less than 1/6 the case B value modified by reddening, suggesting that reddening alone does not account for the line ratios, and radiative transfer effects are offered as a dominant factor for this ratio. However, the broad-line region may have lower density, temperature, and optical depth than broad-line regions near quasars, and thereby have strong Ly-alpha emissions.

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