112 citations · 172 across the 13 of their papers we have counts for
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Near Infrared observations of Soft X-ray selected AGN
D. Grupe, H. -C Thomas
We report the results of near infrared observations of 19 soft X-ray selected AGN. The goal of the observations was to search for strong, narrow Paschen-alpha or Brackett-gamma emi…
RX J2217.9--5941: A highly X-ray variable Narrow-Line Seyfert1 galaxy
D. Grupe, H. -C. Thomas, K. M. Leighly
We report the discovery of a highly X-ray variable AGN, RX J2217.9-5941. This object was bright during the ROSAT All-Sky Survey (RASS), during which a decrease in the count rate by…
X-ray variability in a complete sample of Soft X-ray selected AGN
D. Grupe, H. -C. Thomas, K. Beuermann
We present ROSAT All-Sky Survey and ROSAT pointed observations (PSPC and HRI) of a complete sample of 113 bright soft X-ray AGN selected from the ROSAT Bright Source Catalog. We co…
The enigmatic soft X-ray NLS1 RX J0134.2-4258
D. Grupe, K. M. Leighly, H. -C. Thomas +1
We report the discovery and analysis of the follow-up ROSAT pointed observation, an ASCA observation and optical and radio observations of the enigmatic Narrow-Line Seyfert 1 galax…
The enigmatic Soft X-ray AGN RX J0134.2--4258
D. Grupe, K. M. Leighly, H. -C. Thomas +1
We report the discovery and analysis of the follow-up ROSAT pointed observation, an ASCA observation and optical and radio observations of the enigmatic soft X-ray AGN RX J0134.2-4…
RX J1313.2-3259, a long-period Polar discovered with ROSAT
H. -C. Thomas, K. Beuermann, V. Burwitz +2
We report observations of a new AM Herculis binary identified as the optical counterpart of the X-ray source RX J1313.2-3259, detected during the ROSAT All-Sky Survey (RASS). It ha…
RXJ1313.2-3259, a missing link in CV evolution?
B. T. Gaensicke, K. Beuermann, D. de Martino +1
We present low-state IUE spectroscopy of the ROSAT-discovered polar RXJ1313.2-3259. The SWP spectrum displays a broad Lyman alpha absorption profile, which can be fitted with a two…
RX J0501.7-0359: a new ROSAT discovered eclipsing polar in the period gap
Vadim Burwitz, Klaus Reinsch, Klaus Beuermann +1
RXJ 0501.7-0359 is a new V ~ 17 mag eclipsing polar discovered during the ROSAT all-sky survey (RASS). Extensive follow-up observations at X-ray (pointed ROSAT PSPC and HRI observa…
New bright soft X-ray selected ROSAT AGN: I. Infrared-to-X-ray spectral energy distributions
D. Grupe, K. Beuermann, H. -C. Thomas +2
We present results of an infrared-to-X-ray study of 76 bright soft X-ray selected Seyfert galaxies discovered in the ROSAT All-Sky Survey. These objects are characterized by steep…
Ultrasoft transient X-ray emission from AGN
K. Mannheim, D. Grupe, K. Beuermann +2
We report some remarkable and unexpected results of optical/UV/X-ray follow-up observations of bright soft X-ray selected AGN from the ROSAT All-Sky-Survey. The majority of these A…
Discovery of an ultrasoft transient ROSAT AGN: WPVS007
D. Grupe, K. Beuermann, K. Mannheim +3
We have identified the ROSAT source RX J0039.2-5117 with the previously almost unknown `narrow line' Seyfert 1 galaxy WPVS007 (z=0.028). The X-ray source displays quite unusual pro…
X-RAY OUTBURST OF THE PECULIAR SEYFERT GALAXY IC 3599
D. Grupe, K. Beuermann, K. Mannheim +4
We report optical, soft X-ray, and UV observations of the peculiar Seyfert galaxy IC 3599 using data obtained with ROSAT and IUE. Most remarkably, we discovered a rapid decrease of…