Seyfertn.

1959 Astrophysical Jrnl. 130 26 Another characteristic feature of many of the Seyfert galaxies is the apparently small size of their nuclei in which the broad emission features arise.

1963 Astrophysical Jrnl. 137 1032 It is possible that an event of the Seyfert type is experienced by all spiral galaxies and not only by the Sa and Sb systems. We believe this to be a reasonable assumption, but it has the effect only of reducing the frequency of Seyfert objects among spirals by a factor of 2 or less.

1969 Astrophysical Jrnl. 158 859 The detection of such [nonstellar] absorption features in Seyfert spectra is rather difficult.

1970 Nature 31 Jan. 410/2 Seyfert galaxies with their extraordinarily bright and unusual nuclei could easily be intermediaries between quasars and normal galaxies.

1970 Sci. Jrnl. Feb. 57/1 Many of the phenomena observed in Seyfert galaxies are similar to those seen in quasi~stellar objects.

1971 New Scientist 17 June 695/1 A compact infrared source with a spectrum similar to that of the Seyfert nuclei, but with a smaller energy output.., appears to be located at the centre of our Galaxy.

1968 Physical Rev. Lett. 21 1540/1 NGC1275 and 3C120..are a hundred times more luminous in the radio than most of the Seyferts.

1977 Dædalus Fall 56 The association of X-ray emitters with active compact galaxies..has been confirmed by the discovery of an X-ray emission by the Seyfert galaxy 3C120..and of a dozen more Seyferts by Pounds and his associates working with Ariel-5.