Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...102..116v&link_type=abstract
Astronomy and Astrophysics, vol. 102, no. 1, Sept. 1981, p. 116-118.
Astronomy and Astrophysics
Astrophysics
9
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.
Veron M.-P.
Véron Pascal
Zuiderwijk E. J.
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