NGC 4507 - A weak Seyfert 1 and X-ray galaxy

Astronomy and Astrophysics – Astrophysics

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Astronomical Spectroscopy, Galactic Nuclei, Seyfert Galaxies, X Ray Sources, Balmer Series, H Alpha Line, H Beta Line, Quasars

Scientific paper

The faint X-ray galaxy NGC 4507 (1232-39) observed at the Einstein Observatory by Kriss et al. (1980) is shown to be a Seyfert 1.9 galaxy due to the starlike nucleus and the broad H-alpha component. The X-ray luminosity is 2.810 x 10 to the 41st erg/s which makes the galaxy the faintest known X-ray galaxy. Evidence is given that all nuclear X-ray galaxies contain a Seyfert 1 nucleus or a miniquasar, and the reality of a correlation between the X-ray luminosity and the full width zero intensity of the Balmer lines is discussed.

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