Discovery of an ultrasoft transient ROSAT AGN: WPVS007
D. Grupe, K. Beuermann, K. Mannheim, H. -C. Thomas, D. deMartino, H. H. Fink
Abstract
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 properties for an AGN. It was bright and ultrasoft in the ROSAT All-Sky Survey (RASS) and found at a level lower by a factor of ~ 400 in PSPC count rate in 1993. The implied 0.1-2.4 keV luminosity during the RASS was ~ 1037 W. We discuss possible explanations for the extremely soft X-ray spectrum and the observed variability.
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