Discovery of an ultrasoft transient ROSAT AGN: WPVS007
Astrophysics
2007-05-23 v1
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 ~ 10^{37} W. We discuss possible explanations for the extremely soft X-ray spectrum and the observed variability.
Cite
@article{arxiv.astro-ph/9506087,
title = {Discovery of an ultrasoft transient ROSAT AGN: WPVS007},
author = {D. Grupe and K. Beuermann and K. Mannheim and H. -C. Thomas and D. deMartino and H. H. Fink},
journal= {arXiv preprint arXiv:astro-ph/9506087},
year = {2007}
}
Comments
4 pages, gzipped, uuencoded PostScript, Letter accepted by Astron. & Astrophys., also avalailable on the web (http://www.uni-sw.gwdg.de/preprints/preprints.html)