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Astron. Astrophys. 350, 805-815 (1999)

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New bright soft X-ray selected ROSAT AGN

II. Optical emission line properties *

D. Grupe **  1,2, K. Beuermann 1,2, K. Mannheim 2 and H.-C. Thomas 3

1 MPI für Extraterrestrische Physik, Giessenbachstrasse, 85748 Garching, Germany
2 Universitäts-Sternwarte, Geismarlandstrasse 11, 37083 Göttingen, Germany
3 MPI für Astrophysik, Karl-Schwarzschild-Strasse 1, 85748 Garching, Germany

Received 18 May 1998 / Accepted 3 August 1999

Abstract

We present the emission line properties of a sample of 76 bright soft X-ray selected ROSAT Active Galactic Nuclei. All optical counterparts are Seyfert 1 galaxies with rather narrow permitted lines, strong optical FeII line blends, and weak forbidden lines. By selection, they also have steep soft X-ray spectra when compared with typical Seyfert 1 galaxies. We discuss possible origins of these peculiar trends employing detailed correlation analyses, including a Principal Component Analysis. The optical spectra are presented in the Appendix.

Key words: accretion, accretion disks – galaxies: active – galaxies: nuclei – galaxies: Seyfert – galaxies: quasars: general

* Based in part on observations at the European Southern Observatory La Silla (Chile) with the 2.2m telescope of the Max-Planck-Society during MPG and ESO time. All spectra can be retrieved via CDS anonymous FTP 130.79.128.5.
** Guest Observer, McDonald Observatory, University of Texas at Austin

Send offprint requests to: D. Grupe (dgrupe@xray.mpe.mpg.de)

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© European Southern Observatory (ESO) 1999

Online publication: October 14, 1999
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