ROSAT HRI monitoring of X-ray variability in the NLS1 galaxy PKS 0558-504

M. Gliozzi, Th Boller, W. Brinkmann, W. N. Brandt

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


We present the results of ROSAT High Resolution Imager (HRI) observations and the survey data of the radio-loud Narrow-Line Seyfert 1 galaxy (NLS1) PKS 0558-504. We find strong and persistent X-ray variability on both short and medium time-scales. The most extreme amplitude variations require a radiative efficiency exceeding the theoretical maximum for a Schwarzschild black hole, suggesting the presence of a rotating black hole or the influence of relativistic beaming effects. The spatial analysis rules out the possibility that the high luminosity and the strong variability are related to a nearby source.

Original languageEnglish (US)
Pages (from-to)L17-L20
JournalAstronomy and Astrophysics
Issue number1
StatePublished - 2000

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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