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Astron. Astrophys. 320, 395-398 (1997)

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Spectroscopy of narrow emission line X-ray galaxies

Lutz Wisotzki * and Norbert Bade

Hamburger Sternwarte, Gojenbergsweg 112, D-21029 Hamburg, Germany (e-mail: lwisotzki@hs.uni-hamburg.de / nbade@hs.uni-hamburg.de)

Received 7 May 1996 / Accepted 11 July 1996


We present new X-ray and optical data of six emission line galaxies detected as sources in the ROSAT all-sky survey, of which previous optical spectroscopy had resulted in ambiguous classifications. Our high S/N optical spectra show all targets to be AGN, with five narrow-line Sy 1 galaxies and one of type Sy 1.8. Three objects have permitted lines of FWHM [FORMULA] km/s, only slightly broader than the forbidden lines. In all five narrow-line objects, the Fe II line complexes can be detected. The X-ray spectral properties of the sample, however, are consistent with a random AGN sample, and neither particularly soft X-ray spectral slopes, nor significantly enhanced variability can be seen. We briefly discuss the implications for the optical identification of current and future deep X-ray surveys.

Key words: Galaxies: Seyfert – Quasars: emission lines – X-rays: galaxies

* Visiting Astronomer at the German-Spanish Astronomial Center, Calar Alto, operated by the Max-Planck-Institut für Astronomie, Heidelberg, jointly with the Spanish National Commission for Astronomy

Send offprint requests to: L. Wisotzki

© European Southern Observatory (ESO) 1997

Online publication: June 30, 1998