SIMBAD references

1999ApJ...517..622X - Astrophys. J., 517, 622-626 (1999/June-1)

Spectroscopy of 18 new narrow-line Seyfert 1 galaxies from the ROSAT all-sky survey.

XU D.W., WEI J.Y. and HU J.Y.

Abstract (from CDS):

We present the discovery of 18 narrow-line Seyfert 1 galaxies (NLS1s). Three out of the 18 objects are quasar-luminosity NLS1s. The data presented here significantly increase the number of NLS1s. The new NLS1s were detected in the ROSAT All-Sky Survey. The optical spectra show Balmer lines only slightly broader than the forbidden lines and contain strong Fe II emission. No particularly soft X-ray spectral slopes can be seen as compared to a normal Seyfert 1 galaxy sample.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Seyfert - Galaxies: Quasars: Emission Lines - X-Rays: Galaxies

Simbad objects: 18

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