1995/06/14 by D. Grupe, K. Beuermann, Grupe, D. +9
Physics and Astronomy · #Astrophysics (astro-ph) #FOS: Physical sciences #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/9506087
4 pages, gzipped, uuencoded PostScript, Letter accepted by Astron. & Astrophys., also avalailable on the web (http://www.uni-sw.gwdg.de/preprints/preprints.html)
arxiv created 1995/06/14 · arxiv updated 2009/12/01
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.