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astro-ph1999★ 5 cited
RX J1624.9+7554: A new X-ray transient AGN
D. Grupe, H. -C. Thomas, K. M. Leighly
We report the discovery of a new X-ray transient AGN, RX J1624.9+7554. This object appeared to be bright in the ROSAT All-Sky Survey, but had turned off in two pointed observations…
astro-ph1999★ 22 cited
New bright soft X-ray selected ROSAT AGN II. Optical emission line properties
D. Grupe, K. Beuermann, K. Mannheim +1
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 narro…