Discovery of an ultrasoft transient ROSAT AGN: WPVS007

Details Discovery of an ultrasoft transient ROSAT AGN: WPVS007 Discovery of an ultrasoft transient ROSAT AGN: WPVS007

1995-06-14

arxiv.org/abs/astro-ph/9506087v1

Astronomy and Astrophysics

Astrophysics

4 pages, gzipped, uuencoded PostScript, Letter accepted by Astron. & Astrophys., also avalailable on the web (http://www.uni

Scientific paper

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 ~ 10^{37} W. We discuss possible explanations for the extremely soft X-ray spectrum and the observed variability.

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